Performing Compression Tests

[EuropeanAM]

When performing compression tests, it's imperitive that the tests be done with:

-A fully charged and PROPERLY RATED cranking battery
-Engine warmed up to Operating Temperature
-Kill switch OFF
-All Spark Plugs Removed
-Plug wires on Spark Tester (or grounded with jumper leads- an added precaution)
-Throttle plate at the WOT Position
-Water supplied to the engine while cranking!

Insert compression tester into #1 spark plug opening, and crank the engine until the reading no longer rises. Record reading. DO NOT spin/crank for longer than 10 seconds at a time.

Repeat above step for each cylinder.

(This post is being added to the Commonly Asked- Commonly Used Sticky for future time-saving reference).