Compression Test - Can you do with cold engine? - Ford Powerstroke Diesel Forum
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Old 06-25-2009, 06:01 AM
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Compression Test - Can you do with cold engine?

Can you do a compression test with a cold engine?

I know hot is the norm but roughly how much PSI difference?

I just need to find the problem cylinder, have suspect rockarm/pushrod issue. Not really that concerned with the exact pressure readings right now.

Since valve covers are already off, really can't warm it up. Also, would have to put back together to do Contribution Test, so trying to avoid that.

Truck is '00 7.3 F350.

Edit 6-29-09: You may need a Mityvac "Powerstroke glow plug adapter" MVA5605 to mate up to your compression test hose. If you have a cheaper diesel compression test kit, chances are there won't be a fitting with enough reach for the Powerstroke, this one is made for it.

Edit 7-6-09: Joke is on me, above adapter will only work with a Mityvac coupler, can't take it apart and refit it to work either...took back my Harbor Freight diesel compression test kit ($26) and getting Mityvac MV5534 ($76 + shipping) which is their diesel gage, hose and coupler only kit, without adapters. Bad thing is I bet the Mityvac is made in China too, plus I hate doing anything to add more $ to help Obama's joke economic "recovery" spending/debt plan.

Last edited by bob00stroke; 07-06-2009 at 06:24 AM. Reason: added info
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Old 06-25-2009, 06:43 AM
wriott
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you can do a test with a cold motor, PSI difference might be 2-3% form warm. you dont need to put the VC back on to do a contribution test, put injectors and GP in to get it running...
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Old 06-25-2009, 10:26 AM
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Thanks for the quick info.

That's a cool panel for gauges/switches you have in that Excursion pic.
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Old 06-25-2009, 11:30 AM
wriott
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its not mine its another members on here, cant remember who. i just ordered the panel and going to be customizing it sorta like that one
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