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Old 04-27-2017, 10:51 AM   #1
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City: Madisonville
Country: USA
Vessel Name: Nirvana
Vessel Model: 41' Litton
Join Date: Feb 2011
Posts: 171
Valve, Rod, Head?

A friend in the slip next to me called this morning asking for help. He said, when he starts his engine (LF120 or 90) it has a loud knocking sound (he said clapping) and in just a few minutes the entire engine room is filled with smoke coming from the valve cover tube. That's about all the info I got at that time "it was early and I was still half asleep". We plan to have a look at it this weekend. Any ideas what is going on?

41' Litton
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Old 04-27-2017, 11:25 AM   #2
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City: Wilmington, NC
Country: USA
Vessel Name: Louisa
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Join Date: Jan 2014
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Post a video of it starting up with oil fill cap removed. Sounds bad, like piston failure.

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Old 04-27-2017, 11:28 AM   #3
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City: Miami Florida
Vessel Name: Possum
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I just want to follow this thread. My wild ass guess is a valve hitting a piston. I'll be interested to hear what the problem really is. It sounds expensive.
Parks Masterson
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Old 04-27-2017, 12:22 PM   #4
City: Westerly, RI
Country: USA
Vessel Name: Northstar
Vessel Model: Grand Banks 36 Classic
Join Date: May 2016
Posts: 11
While traveling the I CW I heard a noise which sounded like a one- lunger engine from a nearby dock. The noise abruptly stopped just as I realized that the noise was coming from on-board. A valve spring had broken, the valve punched thru the piston
and damaged the injector. The remaining 5 cylinders were enough to get to the dock.
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