Compression Ignition Addict
Join Date: Dec 2008
Location: port arthur texas
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There are a number of tests but none are 100% accurate.
You can remove a glow plug at a time and screw in a compression tester adapter. Check which cylinder builds compression and then drops off or is slow to build compression.
Visually check for a broken spring or other obvious damage.
You can install a dial indicator and check the valve travel on each cylinder as you rotate the motor by hand.
All are subjective tho to the experience level of the tester. What a really experienced tester may see, hear and feel will be different than what a novice will see, hear and feel.
Lord I shall lead them to the water but I will not try to make them drink