Oa331 compression test

[mthullm54a2]

I am going through my 51 REO with a gas engine and gave it a compression test all cylinders are around 90 psi it seams kind of low but I don't know much about these engines it dose not burn oil but when we first started it up it was sitting for a couple years and had water in the oil and I was getting some bubbling out of the radiator after an oil change and water just to drive it home now oil in water but brought a gasket set to replace the head gasket just to be safe but my question is is that an ok compression for the engine 90 psi

 

[texas30cal]

I'm not familiar with that particular engine, but the rule of thumb for gas engines is 90 psi minimum to run, it may be hard to start (esp a 2 stroke) and probably won't run very well .

 

[NDT]

That engine has wet sleeves, meaning there are O-rings between the cylinder and block. The water can be coming from there as well.

 

[Mackafd]

I have a few military reo 331 engines and a few of the civil. ones and the books all say 140 psi. but every one of my engines that are in running truck are all around 80-100

 

[mthullm54a2]

I have a few military reo 331 engines and a few of the civil. ones and the books all say 140 psi. but every one of my engines that are in running truck are all around 80-100

Ok i will not mess with it then and call it good for now thank you