Cylinder heads - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

 
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post #1 of 2 (permalink) Old 06-20-2019, 12:36 AM Thread Starter
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Cylinder heads

Does anyone have a source for rebuilt heads? I am having a bad miss in one of my cylinders, causing a loss of power and for it to run like crap. it makes a puffing sound out the exhaust. I cracked the injectors, and adjusted the pump to no avail. I feel like the next step is to do a compression test, and see if its a bad head, and replace it.
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post #2 of 2 (permalink) Old 06-20-2019, 02:27 AM
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It may not be the head that's the problem, maybe just a burnt valve, which a valve job should take care of. Any reputable machine shop should be able to recondition your head.

A compression test will tell you the overall condition of each cylinder but won't tell you much about the cause of low compression in any particular cylinder. What you need to do is a leakdown test, applying compressed air to each cylinder when it's at TDC of the compression stroke and listen for where the leakage is coming from, intake, exhaust or crankcase.

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