no compression

[ncbrew]

I am also going to torque the injector hold down nuts.

[ncbrew]

Originally Posted by skipperpete

Well done, thanks for the update. You must have had some compression if she fired up. This probably doesn’t concern what you’re doing with a valve adjustment but Yanmar numbers the GM cylinders from the flywheel, this is only relevant if you’re doing the injection timing. The rough running might be due to air in the fuel system, that makes the engine clatter a bit more than usual but there’s also the possibility that the precom lower chamber is mis aligned. This can only happen if the little dowel pin is missing but it’s worth a mention since the precombustion chambers were out at some point.

I did not move the lower pre-combuston chamber. I put in new upper pre-combustion chamber
I assume i would have to take of the head to remove the lower pre-combustion chamber.

[sinnerman]

"A hard knock" would have me worried.

BTW I hope you used a torque wrench when reinstalling the parts...

My two cents