Author Topic: engine shakes  (Read 1701 times)

chuck stas

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engine shakes
« on: June 09, 2022, 09:32:47 AM »
Good Morning, Does anyone have or had this problem ?
I have a 1983 P303 with a yamar 13hp diesel. When I start it [ Starts easy ] It run great. When I put it in gear the engine shakes a lot, than when I bring the RPM's up it stops. At 1st I through there was something stuck on the prop. When it stops I'm good to go went 14 hours with no problem.
Cutlass bearing was tight. When I checked it before it was put back in the water.
Any ideas of what I should look at.
Thanks for any help

Valor

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Re: engine shakes
« Reply #1 on: June 09, 2022, 11:42:15 PM »
Maybe a bad motor mount.?
Michael M

1978 Pearson 323 Hull #108.
Yanmar 3GM30F

chuck stas

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Re: engine shakes
« Reply #2 on: June 10, 2022, 11:42:07 AM »
I'll take a look,  not sure how old they are.
Whats the best way to check them ?

Last Resort

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Re: engine shakes
« Reply #3 on: June 10, 2022, 09:03:07 PM »
not sure how much shaking your talking about, but I've never been able to run my 2gm20 between 2200 and 2500 rpms without some vibration/shaking. Just seems that one spot that won't run smooth.

chuck stas

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Re: engine shakes
« Reply #4 on: June 11, 2022, 10:39:13 AM »
Thanks for the input. It shakes a lot. But then stops and runs smooth. I don't think its the engine that runs smooth. Can't figure why it just stops shaking than runs OK.
Wish I could help you with why yours is not behaving at 2000-2500 RPM. If I hear of something I'll let you know.

JustinAlenScott

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Re: engine shakes
« Reply #5 on: September 22, 2022, 01:17:51 PM »
I don't know much of anything about this engine, but is there a chance that when you throttle up high like that it's getting a lot more air until the fuel catches up and evens out the mixture?