Quote:
Originally Posted by asphaltgambler
I work with these engines everyday. In order to do compression test or leak down you'll need to remove the valve covers, remove 1 glow plug, use an adaptor to thread into that hole with a diesel compression gauge. On the 7.3's most people would like to see at or near 400 psi cranking compression for a healthy status.
But - that's only part of the truth. While it is a very good, robust set up, injector failure, glow plug failure, weak high pressure oil pumps are very common. The real test is when you fire it, monitor if any cylinders are laboring when cold and how much blow by is occouring. Feel free to PM me with any questions.
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Thanks. I work on them a little too, I've even rebuilt one about 10 years ago. I have a diesel compression tester w the correct glow plug adaptor for the 7.3. I remove all GPs when I compression test in order for it to spin more easily.
Glow plug failure is no big deal, normal maintenance item. The problems come when people use aftermarket GPs and the ends swell and break upon removal. That's a bad day when that happens. Motorcraft/Beru ONLY!!
There is massive ignorance and stupidity surrounding maintaining these engines and diesels in general. That's why I have about 4 of them sitting in my shop w low compression that should be like new considering the mileage, (if maintained properly). The culprit in each case was improper air filtration, usually due to a K&N or similar junk "performance intake".
I agree w you about 400 lbs. of compression being good though I've heard that they have even more when new.
