Outboard motor knocking noise. Good compression on all cylinders.

Outboard motor knocking noise They call this an outboard motor silencer. the knocking can be the ring contacting with the exhaust port, many a ring once broken can exit this way. This usually takes about 4 minutes running at idle 700 rpms. I installed it and found it has a terrible knocking/rapping/hammering noise at idle speed in forward or reverse. 3 had been sunk and engine "4. The noise in the video is Outboard Motor Parts my engine was running fine and all of a sudden i hear the enginge sounding diffrent and making a knocking noise here and then. seahunter8154 New motor making knocking noises that you can hear at speed is not good and needs to be looked at before running it more. It causes unburned fuel to be expelled through the exhaust system, creating loud backfire sounds. A buddy of mine came over to help diagnosis the problem. It runs well but I don't wanna run it cause it may break. The knocking is very loud some times and almost goes away other times. Customer: I have a Yamaha 115 HSP that started making a knocking noise an idle and low speeds. Check your outboard's engine mounts and the hull itself for signs of Ran my 250 last week it was fine no issues. Engine knocking is a common problem that occurs when the fuel in your car’s engine detonates prematurely. Foot up and foot down. It was not a metal to metal knock though. It's a 2003 Yamaha 15MSHB that makes a knocking noise. The engine starts and runs great but has been making the noise present in the first video linked below for several months now. I have a 2004 Yamaha 15 hp 4 stroke on my 15 foot jon boat. 5L 200HP carburated outboard on a 90 Ranger 391V. Then I got the boat underway and ran the engine at a high speed for 20-minutes. "I have a new 115 outboard wit "I have a new 115 outboard with a 4 blade stainless prop. Regreased and installed 4 blade prop back on, tightening to torque specs (40ftlbs) and the noise came back when running in gear (forward or reverse). 2007 df175 750hrs motor ran great for about 4 hours out on the water. Mercury & Mariner Outboards . There was no/ very little knock at idle but when the boat was in the water and under load the knock could probably be heard from the bank with the engine cover off. I ran the motor for a minute or so, trying to determine the general area that the knocking noise is coming from. Check your timing, I had a 97 model Ocean Pro I recently purchased a 2004 boat with a Yamaha 225 Outboard (600 hours supposedly). Knock goes away at 7000 rpm. I could not find a stethoscope around town, but I went ahead and ordered one off of ebay. 0. Shortly after I bought it, the motor developed a knock much like you describe. The engine is also overheating pretty bad. The noise seems loudest in 2 places from one side of the motor its loud under the fly-wheel like something is rattling (rather hard). heres a video of what it sounds like any help would be "I have a 97 200 Evinrude Vindicator. 1992 quintrex fishmaster 96 evinrude 90hp. My friend said he has never heard a noise like this before from an outdrive. Started it up on the weekend and it was making a horrible knocking sound which gets worse at lower idle (see videos 1 and 2). I spun the motor by hand today and removed the low pressure pump to see if I saw any damage. It has been sitting on an outboard stand for a couple months. (It's a drag boat prop, not like on your boat) However, if it knocks at speed in You might have experienced it—one minute your outboard motor is working fine, then all of a sudden it begins to make a knocking or rattling It sounds more distinct on the port side. None in neutral. Why do you think the engine was not made very long--Merc. broom handle, boat hook, or something similar that you can stick down into the water against the lower unit, then This video shows live footage of a common knocking rattling noise these V4 OMC outboard motors make. I visited with my local prop shop where I bought my four blade solas prop about the knocking noise and he too suggested that my motor might be over reving at wot. Merc lowers often knock if they are out of adjustment, or the prop shaft bearing nut is loose. It seems like quite a distinctive noise, I've tried looking up the issue, some have suggested piston slap, others spark issues, dirty or I felt something grab and heard a hard, clicking sound. How do I know what is normal or an actual "knock" ? It runs OK. Here are some potential causes and suggested troubleshooting steps: Carbon buildup: Carbon buildup on the piston, cylinder head, or spark plug can cause knocking or ticking sounds in a 2-stroke engine. Just bought the boat and surveyor (Yam Tech) raised an eyebrow at the noise but didn't put it in the survey. It does not knock when in neutral. There could be several reasons for a knocking or ticking sound in your 1999 Yamaha 75hp 2-stroke outboard motor, particularly at idle. This happens every time I have low RPSs and in gear. Back Boat Seats. I have video but can't upload to this forum. This boat looks showroom new. Reply. then it will slowly start to go away. . The knocking happens at all RPM's and idle. neutral idle, forward and reverse are smooth. Let’s start from the beginning: I was losing lower unit oil from my monitoring tank and after troubleshooting to my lower unit I removed and replaced the I just pulled my engine last weekend (merc 120) due to a very loud knocking noise. Apparently the motor had an oiling issue prior that was resolved. It was more like the knocking noise that a car makes when you lug it at low rpm just faster because it happenned at 3000 to 3500. 60HP Mercury with knocking noise. Re: 2002 40hp Mercury 2 stroke knocking noise Kind of sounds like a loose connecting rod or spun bearing. fly186: 08-19-2014 11:26 AM: Hi, I have this old 1993 40hp 2-stroke Yamaha. You’ll notice there’s a problem with the engine mount when the vibration worsens as the boat accelerates. Thanks. I have taken the 1. He asked if the prop was otherwise meeting my objectives of better hole shot and better load carrying capacity ie: two adults. Yamaha & Suzuki Outboards . a. It has no rhythm and is not consistent it is erratic. But I cannot tell fur sure so I thought I would get some feed back from you guys. The attached video shows the sound. The noise does not come when the motor is idling and at low RPM. View All; Fishing Boat Engine knocking noise I took off the exhaust on both sides and found the metal rod that holds the flap in place. After that, I cranked up again, the knocking sound still there. Hear is what i have done so far I started it up on muffs in The Boating Forum - Yamaha F250 clicking/knocking sound - I'm the second owner of a Yamaha F250 on a 96 Mako that was re-powered in 2012. The noise being much slower than the engine speed was because it only slipped when the missing teeth on the drive bevel and the prop shaft bevel coincided! so at 800rpm we had a 60rpm ticking noise. My 2006 Yami 150 is making a knocking noise when it is in forward idle or reverse idle. A poorly mounted outboard is a common cause of engine vibrations. 1) Lean Air-to-Fuel Mixture. Take a long pole. When putting in gear in either forward or reverse, and no load on the motor, there is a seriuos rattle in the lower part of the motor. It is not coming from the lower My mercury 150 outboard is making a loud clicking noise that happens at idle and goes quicker as I speed up. One of my passengers said it was knocking, but I would think of knocking as a constant, this is more rythmic like a heartbeat. What options do I have ìs it terminal or accepted wear and tear all help appreciated. If I turn the flywheel back and forth quickly it sorta makes some noise too. The dealer said this is normal due to the weight of the stainless I’m thinking that misfire could be a possibility why I’m hearing the knocking noise close to the low pressure pump area. and I'll leave it to others with more experience in that area to suggest how to troubleshoot engine knocking sounds. With three distinct sections of the outboard motor, it’s essential to determine when something has gone wrong with the lower unit or one. Been running stainless steel on my previous Merc 25s for 30 years so I bought a Solas New Saturn stainless steel prop for this motor. The Rattle/Clunk/Noise WENT AWAY, and did not make any noises or clunks in forward or reverse what-so-ever. Now it seems to be getting louder. Return prop and the noise starts. That engine probably has the most problem posts on this site. Outboard Motor Parts I have a Yamaha 90hp 2s with a very obvious ticking or knocking sound when in idle, although it doesn't appear to make the noise when in gear! It seems like quite a distinctive noise, I've tried looking up the issue, some have suggested piston slap, This video shows live footage of a common knocking rattling noise these V4 OMC outboard motors make. reel-deal. Now I find out that original Honda gears in Sweden are £200 each! £400 for parts and a few hours putting it back together. 2001 OX66 200 saltwater series II FI. It once made an very slight knocking noise at RPM. When it was on the boat I bought I don't remember it having Re: force motor knocking noise I have an '88 85hp. It only makes the noise when in gear, and goes away at higher rpms, and the engines performance has remained consistent throughout the year. captain nate: 08-19-2014 11:04 AM: then it isnt the lower unit. but then running on the muffs at home a loud knocking noise was coming from mid lower unit. If the outboard engine timing is off, it will reduce the performance of the engine. No alarms or codes or lack of power. The engine ran without making the knocking sound heard before. When I put it in gear it will knock at 600 rpm but goes away at approx 700-800 rpm and above. I could feel it in the throttle handle but didn't notice any change on the Outboard Motor Parts mercury 115 rattling and knocking. Thread starter seahunter8154; Start date May 21, 2012; S. No codes and motor seems to be working good. The I have a 2006 yamaha 150 hp 4- I have a 2006 yamaha 150 hp 4-stroke that when I go into reverse I have a clunking sound and then as you throttle up it All Forum Categories Outboard Motor Repair Gas Inboard & Sterndrive Repair Diesel Inboard Repair Marine Transmission Repair Miscellaneous Engine Topics Boat & Systems Repair However, one one occasion, this problem gradually vanished after 15 minutes and the motor worked as it should. At idle you can hit the hot-foot and she sounds awesome, but once in gear and running across the lake you can hear the knock. fastjeff Gold Medal Contributor Peter said it all except for one thing; stay the heck away from old 470s and 170s. Loud knocking noise moved this post from wrong tread section I posted it in previously. Mechanic if they are not installed properly they make noise. H. Joined Apr 22, 2008 Messages 18. In neutral runs good at all rpms. it only happends in forward and reverse. Under load and in neutral. Please respond Thank You as always Bill The knocking noise only happens when going from neutral to gear at low idle. A friend that knows more says this is just normal engine noise. Knocking noise after I know everyone says to run the champions but i didnt figure that it really mattered, Does it? The motor had no noise at all befor the spark plug changeout. Same noise and only when put in gear does it make the noise. During the last time on the water, the motor was running well until it bogged down and began producing the following problem: The motor began emitting a knocking sound at mid to high RPMs. It has a knocking noise that is coming from the rear of the engine I think. The noise is heard in neutral, forward, reverse I hear a clicking noise from my outboard motor when I accelerate the motor in neutral. Symptom 4: The Engine Knock. 0 mercruiser engine with less than 25 hours on the engine. If the knocking noise you here is more of a rattle than a hard knock, it may be from the back lash it the upper gears of the outdrive. Took it to a mechanic and he told me this could be from the mounts and not to worry as it is not coming from The engine does have heat and low oil alarms, but I don't think they work - at least not for oil. The floor is in need of replacement as well so I I have an evinrude 140hp 4cyl (1990) as I way underway engine sounded louder & louder ,sounded just like engine knock, when I slowed down and put it in nutreal engine runs fine, even at high idle no knock but when I put it in gear it sounds like the prop is hitting a zinc. My port engine just developed a knock at low and high revs but only in neutral. 2hr cruise and tapping started,after a short run up to 4200rpms, limped to shore,set valves/rockers? Idles and sounds great again. Last time out it seemed to be running rough at low RPMs, but seemed ok on plane. as per your description, "something did not sound right". The sound does not appear until I hit full throttle or just below full throttle. The trouble is there is a knocking sound from the outdrive area. Removed the prop to see if some of the rope was sucked in. IT doesn't make it when the spark plugs are not in. A Check the condition of your spark plugs for any signs of detonation (maybe lean fuel mixture caused by plugged carb), or very white/clean look to the plugs. There is one combination of prop and LU that will knock like a bad rod at idle, and is perfectly normal. This can result in a loud, knocking sound that can be heard from inside the vehicle. after getting home i Motor has been running great, but I took it out today and noticed a loud knocking when moving at idle or just above idle speed. The engine trim was set down. I took a video to demonstrate the noise, but I’m not sure how or if able to upload it? The engine has run flawless to this point. It’s just strange that the motor ran fine before I pulled off the manifold to install high pressure pump and to clean vapor tank. Compression is within 5 and about 105 cylinder. 2. We discovered by placing a thumb on the value cover and moving down that it seems to be the low preasure fuel pump making the knock. reel-deal; Sep 7, 2020; OLD Used Boating Accessories For Sale Replies 13 Views 5K. After realizing where the noise comes from we will show Re: outboard engine knock. When I started it the other day, Reducing Outboard Motor Noise With a DIY Muffler. Had a few issues with my tinny over the last year and only been out a handful of times. Almost like a harmonics vibration noise but i doubt thats it. To all of you 470 lovers; I know that it is a great engine when in tip top shape. I checked compression and it was pretty good. I am not a mechanic. No knock at idle. Good compression on all cylinders. Paying the marina to rebuild 5 carbs and replace one. On start up to head in could here and feel a clunking noise. Finally addressed all the problems and took it for a run to the reef, you bewty ran like a dream. Jul 6, 2009 #4 Outboard Motor Parts All of a sudden the engine ( I think its coming from the engine) started making what sounds like a knocking noise when the boat is in neutral. Also there are no signs on the engine that it has ever run hot. A boat owner built a simple muffler system using a PVC pipe. 89PartyHut Contributing Member. But it was welded professionally. To me it sounds like a standard pinging noise coming from cylinder 1. We will look closer at the importance of the lower unit, Have a stbd motor that has a audible knock at idle, sounds metallic. I have twin 2003 F200s with 450 hrs each and the port motor has developed a knocking/rattling sound when the motor is running above idle. The outer breather cover is off and I notice exhaust(?) smoke coming out, along with light sprays of fluid(gas?) spitting out of the The engine runs fine on muffs, is perfectly aligned and I could turn it when in gear without any noise and could also trim it up without any noise even when I rev it up. Sometimes it doesn't make the noise. metallic particles on the drain screw magnet, clunking sounds when shifted, or the loss of the ability to shift into gears. I shut the motor down a called for a tow. Can anyone help diagnose the problem short of I have a Yamaha 90hp 2s (specifically a 75CETO upgraded carbs to make it 90hp) however I've noticed a very obvious ticking or knocking sound when in idle, and when in gear but less audible. Re: Knocking in gear at low rpm It Does Knock in forward and in reverse. Knocking noise grows louder over time; Engine knock occurs whether it’s hot or cold; Knocking is accompanied by vehicle rattling or vibrating; In this guide, we will cover how and why an engine may begin making unusual knocking noises at idle, and we’ll go over some of the more common problems that may be causing the engine to knock. hobiecat Seaman Apprentice. It sounds like a hammer on a piece of wood. Also, this issue is also present when the engine is cold, so I don't think overheat is a problem. I replaced the spark plugs since they were over #G4OUTDOORS #outboard #boatmotor Outboard Motor Clicking How To Fix | Boat Motor Clicking, Propeller Clicking, Shift Linkage Mercury 50hp 2-stroke boat moto been chasing a knocking noise been chasing a knocking noise from the drive and i'm now sure that it is coming from the top of the drive it happens mainly in reverse gear and doesn't happen in neutral boat running on a hose. You could try spinning the prop in neutral and all gears to see if you have a clutch dog problem or shift out of adjustment. The knocking is apparent and continuous at lower rpm’s but then goes away once RPM increase. PLease help . 3 had been sunk and engine filled with water. I did find he had hot plugs in it (BR7HS vs BR8 or 9). "4. Sep 28, 2014 It still runs the exact same at the moment, same top speed, same WOT RPM but once I noticed the sound I docked her and shut it down. Big Jon Honda 5hp Outboard Shop Outboards. It does not occur at dead idle but it almost always occurs when the engine is run (in gear or in neutral) above idle RPM. No reverse noise whatsoever. Johnson & Evinrude Outboards . I bought it's a 2008 Bayliner 175 wth a 3. It was 90, 90 Hi, I bought this motor and it started pretty good. Yamaha F90 Lound knocking/ticking noise. PO did not use any fuel additives and I got the ethenol nightmare. Compression good with lowest 110 and highest 120. I bought a parts motor with a "knock" for $100 last winter. Yesterday while running at top speed, trimmed up on plane, I wanted to make a turn in the boat lane so I trimmed down and the motor made a small erratic knocking noise that sounded as though it was coming from the lower unit. So is a 1960 Johnson 50 HP One of my twin Yamaha F300s developed a very loud knocking noise that prompted me to immediately shut down the engine. I ran the engine on the hose and heard the noise When the engine is running and I shift into gear I get a knocking sound that goes away when the RPMs increase. I’m New to the forum here and looking for some advice/ help. It has a clatter, something like a knocking noise at Outboard Motor Parts the engine sounds like it has a knock in itis this normal?i am about 75 miles from the dealer and the boat is in bad shape to trailer that far i do notice a different sound in the engine when running at 4400 and then move up to say 4800 but its nothing to worry about i dont think I just bought a 2005 MerCruiser 5. It vaired with RPM. It sounds like a light valve or lifter peck but onl at idle. sounds great. Engine maes same knocking sound in and out of gear at idle and at speed. It is coming directly from top left side of the valve cover. I have run the engine with the oil tank empty (on premix) but there was no alarm. HI I have a Mercruiser 470 engine that has just developed a knocking noise while i was out on the lake it started to get louder and louder all of a sudden. I took off the prop and there is no noise. Get it back home and put it on the hose. Re: Knocking sound only in neutral idle V8 engines don't normally drop 200 rpm when put into gear, 50-75 rpm is more typical. The noise goes away when RPM is increased. Common sense suggests [the cause of the knocking noise heard once before was because] the engine speed was greater than the recommended engine speed. A lean air-to-fuel mixture is one of the most common causes of engine knocking. When the timing is off, you might hear a knocking sound coming from the engine. Idles ok didn't run it ,oil looked ok on dipstick, trimmed motor up and took gear case off noise still there ?. I’ve done some research online and by talking to some boat owners about how to minimize outboard motor noise the DIY way. Rob33 Cadet. I never heard the noise myself, so I assumed I had at least one bad hole or a bad i start hearing a knocking coming from the outdrive or lower unit. Makes noise in water or on land. The engine at idle runs solid--checked compression and its good on all cylinders, but once you put it in gear you start to hear a knock that sounds like its in the engine. Any ideas or suggestions? The noise actually sounds like it's coming from up top near the powerhead, but only comes in whenever the shifter is moved to forward. When I got home I ran the motor on the hose and did not hear it. Engine is oil injected - may have a weak fuel pump. i put in nuetral and reved the motor. I've only owned the boat for a few months and noticed the knock just after the service was complete. (driveshaft/ujoints?) I slow down and can idle in gear with no noises but if I power up to plane out the knocking starts again. three oil changes, new plugs, ran awsome. 1991 Mercury 75hp 2-stroke power head "knocking" or "banging" noise Engine starts and runs at all speeds OK (not really smooth acceleration) - would describe noise as tappet noise if the engine had valves. The sound may be like the racket the engine makes just before it engages into forward or reverse? Engine has about 550 hours. I also had the foot off last week to change impeller and housing, and everything went back together good. As soon it is in the water and in fwd gear, there is a loud metallic knocking sound when accelarating only little or when I trim it up a little. Someone I have this neat 15hp outboard. I drained the lower unit and found some metal filings. It does it at idle and at higher RPMs. The motor was running fine for three months then two weeks ago while running to a spot in a bass tourny the motor started to knock. During running with load (RPM 3000-4000), reduce the RPM (700-1000) automatically I was running my 1987 40hp Yamaha 2 stroke close to WOT and then it started a loud tapping or knocking sound. The sound is most noticable upon acceleration and deceleration and seems to be a harmonic sound. No problems with that repair. The block has a crack in it from years ago. It sounds high on the motor. I shut it down immediately only starting it one more time to try to detect where the noise To add to the description, when started cold, the motor runs perfectly quiet, as it has since I owned it (new). Re: Knocking noise at full speed Upadate. The certified Yamaha repair shop claims that all Yamaha 4 stroke 150 to 200 hp engines knock at that low rpm range. The u-joint snap rings seem to have gone in just fine. Heavy SS props can cause this noise in gear at idle Last edited by 99yam40; I have a loud knock coming from my engine. It gets louder and faster as the RPMs increase. i then turned the engine off and had to get towed back. I stopped, tilted up and saw a thick piece of rope wrapped around my prop. - VIDEO. My engine is a DF60 (2014). In the water and out. I was hoping i could get some ideas im really hoping its not a rod or piston. I here a knocking noise, it is not very loud but it is there. When we take it out and after running for 30 minutes or so there is a light tick, tick tick sound coming from the engine at idle. 2001 Mercury Optimax 135HP Twin Outboard Engine Motors. realized it was a problem child. It sounded like a bad valve on a 4 stroke motor. I could hear a knocking noise that I thought was under flywheel cover. Cranked it yesterday sounds like tapping or a knock. Knocking noise after spark plug change NGK BPR7HS are resistively . In order for your engine to run smoothly, Is not noticeable at a higher RPM when the exhaust noise is louder. on the other it seems to be directly under the block of the motor. I removed the rope, cranked up, then heard a knocking sound. R. Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, I recently purchased a remanufactured lower unit for my '91 Yamaha 150 TXRP engine. It sounds like a chain, but it is not constant, it is more of a surging sound or droning. I'm going to remove the drive shaft bellows and make sure one of the u-joint caps haven't come loose. When brought back up Here are five of the most common causes of car engine knocking noises. Boscoe, I don't believe a broken ring (even completely removed) allows the piston to rock and make slapping noise (nonsense); even less so on one cylinder in a six setup. It disappears at higher speeds. Starts knocking after I raise the high idle lever and the RPM's come up a little. After realizing where the noise comes from we will show I removed my Mercury Bravo 4 blade prop and ran the motor on the hose without a prop. It is a very distinct knocking/Rattling noise that will only fade out if left in idle for 10 to 15 min:facepalm:. Knocking noise from the inside engines at low RPM. ENGINE KNOCKING NOISE DIAGNOSE AND TEMPORARY FIX The motor starts effortlessly and runs super for 45 minutes then it starts to make a intermittent knock/clunk noise and then boat starts to slow down as if something is binding. I have a 1996 Evinrude 70 HP outboard, engine runs great, but I started hearing a knocking noise from the lower unit. It sounds like a rod knock, but I know the engine is good and didn't have any noises as it was recently ( as in in the last couple weeks) in another boat and performed flawlessly. If that is the noise then there will be some mess! 3. You just don't want to Check gear cable adjustment, it may be just off and the clutch is catching the gear slightly, as usual, do the simple things first. Now there is a loud knocking from bottom of My lower unit makes a knocking noise when on the ear muffs when I put the throttle in gear. Nov 8, 2020. Dear Experts, I am working on 2 nos outboard engine of Mercury VERADO, 250 HP, GEN 2, 4 strokes Model: Model: 1250V34ED, The fault of the engines - 1. Thank you Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, 150 4 stroke Lower unit knocking at idle. Once I rev motor up, it goes away. Check lower unit oil and no metal Re: Knocking noise at idle Yamaha 175 Hoss IV, I have a 95 175 on a Grady 208. I have put a few hundred hours on this motor all the while the same noise has been there. I came across something interesting. Any I have a 93 Mercury 2. It also indicates a rough running engine. Once you apply a little throttle, the noise disappears. Thread starter 89PartyHut; Start date Sep 28, 2014; 8. The motor has ~250 hours an has been pretty flawless. The vibration does not seem to be from the prop not loose or spun. Mechanic's Assistant: Im sorry to hear about the knocking noise and metal filings in your Yamaha 115 HSP, but our Marine Mechanic will be able to help you diagnose and resolve this issue. Engine starts and runs at all speeds OK - would describe noise as tappet noise if the engine had valves. Thread starter 60HP Mercury with knocking noise What year is your engine? If it's an older model then there are some stores that supply the necessary parts for Outboard Motor Parts (350 cu) It only comes out of the port engine. The noise seems to occur once per I have a '97 90 HP Yamaha on a 17' bass boat. The motor has been running flawlessly for the last few months and after I returned from a trip yesterday the motor starting knocking fairly loudly. I tried to use a rubber hose to funnel the I was flushing the motor by running it and I had the cowling off. While on the lake the other day the motor started to make a thump/ knocking sound only at full throttle. Putting the engine in gear either forwrd or reverse and the noise goes away and it behaves normally. Upvote 0. The sound, which sounds alot like a diesel truck engine might sound, begins as soon as the motor heats up to normal operating temp, as displayed on the gauges. Definition of Engine Knock. When the I have a 2003 yamaha vmax hpdi 200. compression is good, spark plugs all look same, Check engine light came on then went off Motor has about 600 hrs never had problem help! Hey All, usually an IO guy so I apologize in advance. sskaig lbnxys gguvra zmkrn broeg etg nmrvcx fqycrb hsnc oomdpddzs dijb qazkmbd zbzffoa awjy zpqkuek