Low compression

Shakinboxcarjoe · Post by **Shakinboxcarjoe** » Wed Dec 24, 2014 10:25 am

Finally wired up motor to crank it over. Checked compression between 40-60 in all cylinders. Do you guys find a valve lapping and honing, new rings usually do the trick? Also this is a 51 m38 but I suspect it's a civvy motor. It's 24 volts but it came withe civvy carb and fuel pump...how can I confirm? Thanks

buzzk · Post by **buzzk** » Wed Dec 24, 2014 1:22 pm

I think it should say on top of water pump the block boss there is a serial # starting w/ MC 123456 etc the motor mount supports are opposite one facing forward and one backwards buzzzzz

Post by **wesk** » Wed Dec 24, 2014 9:17 pm

The only way to ascertain for certain what chassis Willys originally installed an engine in is the serial number prefix stamped on the boss above the water pump.

MB = Willys MB
V = CJV35
MC or RMC + Willys M38
CJ2A or J = CJ2A
3A = CJ3A & DJ3A
P = Pickup
U = Utility