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standard motor co. diesel 1951

2

250don

New User
what should my 1951 standard motor co. diesel have for compression one hole has around 80 lbs and the other 3 not quit 60 lbs
 
Will a diesel actually start and run with such low compression :?
Most likely it does need a rebuild but I would be suspecting a faulty compression tester.
 
Ya i can't see it even starting that low honestly. Out of curiosity is the valve train really noisy? Or not holding the valves closed all the way etc..

60psi is roughly 4:1 and 80psi is roughly 5.5:1 ratios.
A gas engine will run that low but have no power at all and be not happy. Diesel needs at an absolute bare minimum 5:1 for self ignition and might idle and that's it.

Healthy gas engines run in the 7-9:1 range while average diesel runs in the 18-19:1 range. Just depends on manufacturer and application.
 
I used 2 different testers and both came up the same but it will not start at all with this compression. So I got the head off last night and yep the rings are all broken and one hole a piece of the ring came up and chipped the piston. looks like who ever had it last tried to start it on starter fluid maybe that's what did the rings in there is no scratches in the walls just the one hole that the ring got the piston. Thanks for the help everyone!
 
No your right it will not start at all. I pulled the head last night the valves look great but all the rings are broken. Its the old saying it was running when he parked it, but that's ok. I bought it for a project and to have it around the ranch. I'll learn all about it now doing a rebuild on it.
 
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