Compression Test

[early99powerstroke]

I was hoping someone could chime in to tell me if I did this right? I was told to use an air nozzle to blow the oil away from the glow plugs because some oil could get into the cylinders and mess up the compressio readings. I don't have an air nozzle for my air compressor so I cranked the motor ten times after pulling the glow plugs hoping that would evacuate any oil that may have fell into the cylinders(was that a good idea)? I also did my compression testing after getting the motor up to operating temperature. My reading were around 380,380,380,350,350,365,365,365. Do you think my motor is any good? Thanks!!

 

[CSIPSD]

Motor sounds fine for a 200k truck... I wish my motor had that good of compression numbers.

420 or so is new

300 or below is considered a dead hole.

Mine seems to run fine at 330-320 range...