Compression testing

[2000Durahoe]

If valves are set way to tight or loose, will that show on a cylinder compression check?

 

[GrandmaLS]

I'd imagine if you're valves were super loose it would show but not if they were super tight. What'd you fuck up this time?

 

[dave89iroc]

extremely tight valve lash would show as low compression, as the valves would be hanging open

 

[Ponyryd]

^Yep, it should show low compression, but just cuz' the comp. is low doesn't mean it's the valves.

 

[dave89iroc]

^Yep, it should show low compression, but just cuz' the comp. is low doesn't mean it's the valves.

correct, just one of many reasons

 

[Sean]

Do a wet dry test. Test all cylinder dry and then add oil to each cylinder and retest. If its rings the compression will come up. If it doesn't its valve train. If it takes more then 2-3 stroke to build full compression you have cylinder wear issues.