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Old 01-09-2009, 07:24 AM
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Angry Dealership just called

Well, after a flurry of problems, having to have the dealership replace the IPR and ICP, they held the truck to do a compression test because they said there was a slight miss. All the cylinders are good (400-450psi) except for #7. that one was in the 300 psi range. They said my option is to replace the motor with a new or rebuilt. that was right before i dropped the phone. they want to charge me 10 grand because they can't find the problem in one cylinder???

the only real problem is the truck smokes at startup (when cold) and i mean it smokes like a CAT motor on a cold morning.

I had the oil tested, they said it was great, no contaminants, and the #7 injector was just replaced a couple weeks ago. (by a reputable garage)

I'm goin to get the truck tonight, but does anyone have any ideas on what it could be???
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Old 01-09-2009, 07:32 AM
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Could be a bad valve seat or a head gasket.
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Old 01-09-2009, 07:33 AM
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just a FYI-

i had an injector replaced...and died probably a month later...by a good shop so. who knows. Certainly not saying its your problem, but its not out of the realm of possibilities for a new part to die almost immediately....haha, I mean, look at the CPSs on the 7.3s


GL on the fix..
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Old 01-09-2009, 07:34 AM
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no oil is on or around the head gasket, so i'm kind of ruling that out. explain a bad valve seat, is that something that can be fixed easily, or is it a matter of a new cylinder head?
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Old 01-09-2009, 07:36 AM
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not necessarily new, could be a machining repair, but head would have to come off
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Old 01-09-2009, 07:41 AM
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Quote:
Originally Posted by Hawker View Post
no oil is on or around the head gasket, so I'm kind of ruling that out. explain a bad valve seat, is that something that can be fixed easily, or is it a matter of a new cylinder head?
You wont see oil around head on all head gasket problems. The valve seat requires the removal of the head and re seating the valve buy using a valve grinder and seat tool. I don't know how common it is on a diesel.
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Old 01-09-2009, 07:43 AM
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i'm just trying to narrow the possibilities. i mean, the cylinder isn't totally dead, it still holds 300psi. where else might there be a loss in compression besides the piston rings?

could it be a glow plug?

and if the rings were bad, wouldn't that show up on the oil report?
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Old 01-09-2009, 07:45 AM
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300psi range? If there isn't any damage to the valve train, sounds like you have a dusted cylinder or cracked/suck ring or rings.
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Old 01-09-2009, 07:47 AM
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How did they do the complression test? did they add oil after the initial finding??

Recommending to replace a motor just because you don't know what the problem is, quite frankly is a crock of SHAT! What a bunch of
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Old 01-09-2009, 07:48 AM
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Quote:
Originally Posted by Dirk View Post
300psi range? If there isn't any damage to the valve train, sounds like you have a dusted cylinder or cracked/suck ring or rings.

fill me in on that a little more. i've heard the term before, just don't know what it all means.

is it possible to still run the truck with a dusted cylinder, and bad rings?

can the rings be replaced without pulling the ENTIRE motor out of the truck? like pulling the oil pan, and cylinder head and doing it that way?
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