I'll just add this:
You can send an email
, or call Yanmar
, and ask them about your compression
. They are sometimes a bit slow about getting back to you (so send the email
now), but they have always answered every question I've had for them. Also, if you're near a city of size there should be a Yanmar service
shop in town that you can ask.
I checked my service
manual (for a 4JH2), and it says that all the cylinders should be within 75% of eachother, from the highest to the lowest. 410/500 is 82%, so if 500 is on the high side, the others are as well, because the range is fine.
But according to the 4JH2 manual, your readings aren't too off as far as ranges go. However, it's giving me example readings of 115psi and 120psi, but that could very well be because of engine
There are some people on here a lot more knowledgeable than myself about diesels, but that's what I can gather from my manual for you :-)