QUOTE(Hammy @ Oct 2 2007, 10:23 PM)
I have an engine I need to do a compression check on... The engine is about 2 feet off the ground, each side of the engine mount bar is supported on blocks and there are two jack stands under the rear of the case. I have a spare tranny and starter to use...
Anyways, will this be safe? Or not a good idea?
Hell, I would do it in a heart beat..... Just stick sumpin under the tranny tail. And have at it.
I usually do this with the engine and tranny on the concrete. The HEs hold it up.
The engine won't torque hardly at all. Have no worrys.
Make sure ALL 4 plugs are out. Throttle is wide open. And have at it.
Be aware that your compression check is being done on a COLD engine. And the accuracy of this won't be anywhere near perfect.
Yet it will tell you if you have a bad cylinder or cylinders. And that would result from valve issues or ring issues. or both...........
It will also tell you how close the cylinders are in compression.
If you get a low cylinder. Toss a couple squirts of oil into that one cylinder and see if the compression comes up. If it does. Thats a ring issue.
Might also be a good time to do a leak down test. Which is MUCH better than a compression test. If'n you have one.
Cheers,
Clayton
UUhhhh...... How long has this engine been sitting???? And is it a known engine?