'03 bad compression cylinder 8 - Ford Powerstroke Diesel Forum
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Old 04-29-2011, 08:55 AM
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'03 bad compression cylinder 8

I brought my F350 to an independant Ford shop to diagnose it as I have been throwing parts at it (injectors, ICP sensor, cvam sensor, etc.) and was informed that compression on cylinder 8 was bad (in the 150 range IIRC).
They quoted me $11000 for a reman installed, so I said thanks but I'll have to consider my choices.

I'm going to be pulling the head myself to see what's what and if it can be repaired without going the whole engine route.
Anything I should be aware of specifically?
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Old 06-13-2011, 09:23 AM
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Hhmm, 93 views and no replies. I guess no one is interested in what I found, then.
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Old 06-13-2011, 09:26 AM
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I will bite, what did u find?
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Old 06-13-2011, 09:54 AM
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My guess would be UCVH or a CPS issue.
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Old 06-13-2011, 10:03 AM
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Nope.
Severe cylinder wall wear just below the ridge.
I pulled the engine and removed the pistons, #8 had crown damage and the top compression ring land was toast. You could see where the piston crown was hitting the cylinder wall.
Guessing #8 injector misfiring or not injecting enough fuel and caused a lean condition that overheated the pison enough to distort and damage the cylinder wall. All other pistons and cylinders were fine. Still have the cross hatch pattern, even.
Block is at the machine shop getting #8 sleeved and then all punched out.20 over.
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Old 06-13-2011, 10:30 AM
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What is your total cost?
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Old 06-13-2011, 10:46 AM
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Total for the machine shop is about $550. I won't know the total cost for the rebuild until I'm putting the engine back in the truck.
I'll have to get pistons and rings and all the gaskets/seals and various sealants, etc.
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Old 06-18-2011, 03:32 PM
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Hmmm Deja vu! I'm jus finishing up the same problem total cost Inc injectors 3700.00.
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Old 06-18-2011, 06:17 PM
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you can't run a diesel lean and cause damage like a gas engine. overfueling is what causes excessive heat and piston damage

too lean on a diesel means no combustion
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Old 06-20-2011, 09:43 AM
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Well, that was the machinists theory.
From my understanding, #8 is usually the problem injector/cylinder. When I took it apart, I could definetely see where the piston crown was hitting the cylinder wall, as well as the ring land wear. All other pistons and cylinders looked good.
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