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Old 08-21-2019, 11:23 AM   #1
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New vibration

Good morning. We experienced a new vibration yesterday. My question is can out of adjustment valves cause extreme vibration at higher rpms? Have never adjusted the valves but runs fine. It sounded like chain sliding in the locker but unfortunately wasn’t. It comes and goes but more at cruising rpm. Almost sounds like valves clattering? Is this a thing in the 120 Lehman? No changes in oil pressure or power. Kind of lost here. I’m gonna to do a thorough inspection today but in the water so can’t check outside prop or bearings. Any help appreciated. Terry
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Old 08-21-2019, 01:28 PM   #2
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If it's the valve adjustment, it's probably in 1 or 2 cylinders and would have to be way out of adjustment. Valves need to be routinely checked and adjusted because the valve stem and the rocker pressing against it wear. When the clearance gets too big, they wear faster, eventually damaging the parts beyond repair. It can damage anything in the valve train, even the cam or the gear driving it. Out of adjustment valve clearances make a louder ticking noise.

You should check the motor mounts with the engine running, in gear, for any movement. Or with the engine off, use a long pry bar try to move the engine and mounts. Inspect the shaft, coupler and any bearings for movement. Make sure the coupler bolts are tight. Turn the propeller shaft by hand and feel for any tight spots in a 360į rotation.
Often a sudden addition of vibration is something on the prop. Usually a line, but even something organic like kelp can hold on a long time.
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Old 08-21-2019, 02:54 PM   #3
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Something that causes all kinds of racket and symptoms is a failing dampner plate. When all else checks out....listen at the bellhousing, look for rust bits of metal under it, you can pull the starter and try to look for metal in the housing, even drill a small hole and use a boroscope to inspect.
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Old 08-21-2019, 03:26 PM   #4
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This comes and goes so probably not valve train? Maybe picked something up outside. Boats in n the water for now. It’s very loud when it comes on and then it’s gone. Weird. Thanks I appreciate your input
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Old 08-21-2019, 03:46 PM   #5
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Same thing with my dampner plate....on and off for a couple days with hellacious racket. then nothing for 500 Mile's, then totally locked up the engine.
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Old 08-21-2019, 04:33 PM   #6
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We were in the TSW a few years ago. Went through a small lake with heavy weeds. I backed down several times and still had a vibration. When we went over the Big Chute railway the lockmaster went under the boat and pulled a bunch or weeds off the prop shaft. Vibration solved.
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Old 08-22-2019, 08:23 AM   #7
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Damper plates do come in many grades OEM is usually not the finest.
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Old 08-22-2019, 09:09 AM   #8
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If it's a loud noise, then not the valve train. I also think damper.

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Old 08-22-2019, 09:20 AM   #9
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Thanks

On my way today or tomorrow but certainly appreciate each of you sharing with me.
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Old 08-22-2019, 09:31 AM   #10
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Quote:
Originally Posted by psneeld View Post
Something that causes all kinds of racket and symptoms is a failing dampner plate. When all else checks out....listen at the bellhousing, look for rust bits of metal under it, you can pull the starter and try to look for metal in the housing, even drill a small hole and use a boroscope to inspect.
What he said plus the dampener plate is a maintenance item. I don’t remember the hours that it should be changed but if it fails, you are dead in the water. It took about 6 man hours to change ours.
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Old 08-22-2019, 08:04 PM   #11
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So pull the boat then the shaft,transmission and then the plate rite? Thanks for responding.
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Old 08-22-2019, 08:15 PM   #12
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So pull the boat then the shaft,transmission and then the plate rite? Thanks for responding.
You can do it in the water as long as you can push the shaft rearward enough for the transmissions to pull out. You have to clear the hole in the dampener plate with the transmissions splined shaft.

You may have to rig something to support the engine if the rear motor mounts are on the transmission.
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Old 08-22-2019, 10:58 PM   #13
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Thanks a bunch. Thatís gonna save a load and f money.
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Old 08-22-2019, 11:01 PM   #14
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Unreliable memory says damper plates last about 2500 hours before needing replacement.
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Old 08-23-2019, 12:30 AM   #15
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Unreliable memory says damper plates last about 2500 hours before needing replacement.
LOL
They last as long as they last.
Mine are now at 7000 hrs roughly. and still going strong.
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