Yanmar 3GM

[ramblinrod]

Originally Posted by pacerow

I have a 3GM aboard my Morgan 323. I have the hand crank to start it manually. I move the two decompression levers back, but I still have a compression that I can't pull the crank through. I assume that the engine should free-wheel until I activate the decompression levers. Am I doing something wrong, or is this 70 something body showing it's age?

A 3GM should have 3 decompression levers. I am installing on in my boat right now (3GMF) and it definitely has 3 levers.

[roverhi]

I've got a 3GM30F. It has three compression release levers. Had to reinstall the drive belt for the salt water pump this past week. Activating all three compression release levers made it easy to turn the engine over. Didn't fully activate one of the levers at first and couldn't turn the engine over once that cylinder came up on the compression stroke. Fully engaging all the levers cured the problem.

[pacerow]

Want to thank all of you for response. Back lever was removed and round head bolt put in. Thought it was part of valve cover. Happy voting. Pacerow