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Old 04-11-2012, 12:31 PM
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compression Test a 6oh

Hey guys...

Is there any way to run a compression check on an engine not in the truck (spare engine)???
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Old 04-11-2012, 12:56 PM
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Should be able to as long as you have a starter on it. You just have to jumper the starter to do it. Pull all your glow plugs out and crank it over a dozen times to clear any fuel or oil out of the cylinders. You will need a compression tester and adapter to fit the glow plug hole. With the adapter in place crank the engine over 5 revolutions (i think thats the correct number to get the most accurate reading). Make sure you crank the engine over the same amount of revolutions for each cylinder. You can make a mark on the harmonic balance so you can watch and count the revolutions. Good luck
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Old 04-11-2012, 02:55 PM
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I guess if you have a starter, a flex plate and rear cover(oh and a couple batteries). I would do a wet compression test on it since it's probably been sitting a while....and atleast clear the pan of any old oil and put some fresh stuff in it. you don't want the oil pump losing prime
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Old 04-11-2012, 03:40 PM
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Wow...that is what I mean when I tell people there are alot more smarter people on here then me



Sinner:
I understood the "starter, batteries, and adding oil"


could you please explain "flex plate, rear cover and wet compression"

in my language...(stupid)





Thanks man

here are some pics..


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Old 04-11-2012, 05:34 PM
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okay so the trans is still mated so your flexplate and rear cover are still on the engine.

wet compression would be just squirting a couple shots of engine oil into the cylinders to keep the walls lubricated while the engine is spinning. this will allow for slightly better compression readings due to the rings ability to seal with the added oil.

I would pull all of the glowplugs so you get true unbiased readings on each individual cylinder. make sure the intake manifold opening is unrestricted too


BTW when you remove the ficm harness connectors from the injectors you do not have to remove the metal clips, they will press straight downwards and release without being physically removed from the connector.
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Old 04-11-2012, 05:40 PM
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Ok thanks for that... that makes alot more sense now



Really... well I feel stupid lol.. when I took them out last night a couple sprung across the room lol...

Took a while to find them hehe

Sent from my DROIDX using AutoGuide.Com Free App
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Old 04-11-2012, 06:21 PM
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Don't because I did it too a long time ago. They are not magnetic either so don't drop them down under the intake manifold
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Old 04-11-2012, 06:49 PM
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thanks man!!!
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