It\'s a normal compression tester so not one that tests each face.
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Show posts MenuQuote from: Grant Monkhouse;857920Yes, crank the engine over by hand
Quote from: grinder;857902you can use a ATF trick if they are stuck ( auto trans fluid )
You can inject 5mm into each spark plug , leave it ( maybe overnight ) , the i think you have to start it .. it WILL produce clouds of smoke though
The ATF breaks down any carbon build up in the housings etc...