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Originally Posted by Brian Carlton
.......no kidding.........learn something new every day.........and you can do it on gas as well??..........shut the fuel on the one cylinder??
What's the difference in readings as compared to crank speed..........I'm quite curious on that.........if you've ever done it.........
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Detroit Diesel prefers running (Dynamic) compression insted of a traditional static compression test.
On gassers, use a test sparkplug (A sparkplug with a clip welded on it to attach on a ground) while testing compression so you don't fry the coil. You can't stop fuel on carburator engines.
On mechanical diesels (Like ours with external injectors and injection pump), remove the injection line and injector. Cover the IP port with a rag so fuel is not spit everywhere. DO NOT use the glowplug type adaptor and run the engine with a normal 0-500 or 0-1000psi testor. Running the engine with that and a working injector will pop the line/gauge.
HERE is a good page on g@sser testing.