Did I perform my compression test correctly?

[early99powerstroke]

I brought my 7.3 powerstroke up to operating temp. removed the valve covers and unplug the injectors and glow plugs. I then removed the glow plugs. I cranked the motor over 10 times to evacuate any oil that could have fallen into the cylinders. I then hooked up my compression gauge up to each cylinder cranking the motor over ten times for every cylinder. Did I do this correctly? my readings were between 350psi - 380psi.

 

[CSIPSD]

Sounds about right... A little over done. The numbers should have stopped moving at about 3-5 rev but...

 

[JAP]

I thought it was recommended to do them cold?

 

[Aaron S]

I agree with that method. Ive been told to perform the test warm aswell. I wonder if anyone has had enough patience to do it both ways and see if there is any difference?

 

[JAP]

I think the idea behind doing it cold is because that tests worst case scenario.

 

[Aaron S]

Makes sense. Low compression seems to cause the biggest issues with cold starting and excessive smoke when cold.

 

[early99powerstroke]

What i'm worried about though is the little amount of oil that could have gotten into my cylinders when i pulled the glow plugs cuz i didn't have an air nozzle and air compressor to remove the excess oil. So i cranked the motor over 10 times before hooking up my compressio gauge. Would that remove all the oil so it wouldn't mess up my readings? Thanks!!