Is it possible

[Dan1raysouth]

Is there anyway to check for compression while engine is out of vehicle. I have a 1998 Yukon 5.7 vortec L31. And looking to purchase a used engine because I’m running low on money.

 

[b454rat]

Hook up cables to starter, should crank it over fast enough to build compression on a gauge.

 

[Schurkey]

^^^ Yup. I've done that. Be sure there's oil in the pan, and the engine is upright.

Works good on "most" GMs; but engine families that have the starter bolted to the bellhousing instead of the engine (Ford, Chrysler) will require the bellhousing to be attached, complicating things.

 

[1998_K1500_Sub]

You could certainly do a leakdown test on it w/o concern for a starter & battery.

Reference:

Compression Testing vs Leak-Down Testing | Pegasus Auto Racing Supplies

Looking for information on Compression Testing vs Leak-Down Testing? Then come read about it at Pegasus Auto Racing Supplies!

www.pegasusautoracing.com

Others here may offer valuable comments in this regard.

 

[theunderlord]

^^^^yup. ye old leak down test would be easier.