Compression Testing 1963 75hp

[yorab]

Motor in signature. As part of troubleshooting for water intrusion into the port bank cylinders, I'd like to do a compression test. The Top Secret file says to warm up the engine first. However, I'd like to do this cold if possible. That's because if the water is coming from a leaking exhaust cover gasket, I don't want to shoot a fresh spray of water into the cylinders and internals during engine warm up.

​Will I get any useful information if I run the compression test on a cold engine?

 

[GA_Boater]

Do it cold and look for even numbers within 10%.

 

[racerone]

No need to warm up a motor to do a compression test.----Just not sure where those wild ideas come from !

 

[F_R]

Compression tests are usually done to evaluate the condition of a motor before doing repairs on it. So, how are you supposed to do it warmed-up if you haven't fixed it yet?

 

[yorab]

Ok. Maybe a moderator can remove that post about compression testing in the Top Secret File that says to warm up first. It may cause confusion (it certainly did for me).