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Old 13-07-2021, 13:58   #16
Marine Service Provider

Join Date: Sep 2014
Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
Posts: 2,416
Re: Yanmar 2gm Fuel Injection Adjustment Screw broken off / missing - Low compression

I wouldnt necessarily panic about the valve hitting the piston. If you have a mark on the top of the piston it isnt the end of the world.
This is not to say that letting the carbon buildup get that bad isnt a bad thing but just to say that the piston hitting the valve should crush the carbon I would guess before it does other damage.
I would check that pushrod for straightness as well.
Be interesting to hear MikeHonchos reasoning. I'm not looking for an argument but he may know something or have experienced it differently.
Compass790 is offline   Reply With Quote

2gm, compression, fuel, yanmar

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