any engine problems

[f5fstop]

Yes, we issued a bulletin months ago.
Valve guide wear is the problem. New cylinder head the dealer will install will have hardened valve guides to prevent this from happening again.

How many miles on your vehicle?

[DURAMAX TIM]

A guy I work w/ just had #3 piston sieze up @ 12,000 miles.
I haven't talked to him personally but mutual friend said it's getting a new motor.

[f5fstop]

Originally Posted by DURAMAX TIM

A guy I work w/ just had #3 piston sieze up @ 12,000 miles.
I haven't talked to him personally but mutual friend said it's getting a new motor.

Different problem. Sounds like one of those, "it happens" type repairs. Nothing on the horizon for siezing pistons, but "sh*t happens." Not the cylinder head issue that the bulletin was issued for.

[cestwick]

Originally Posted by f5fstop

Yes, we issued a bulletin months ago.
Valve guide wear is the problem. New cylinder head the dealer will install will have hardened valve guides to prevent this from happening again.

How many miles on your vehicle?

Mine just started getting the p0300 codes in the last 2 weeks. 4600 miles.
Not looking forward to doing this job.

[HummBebe]

Originally Posted by cestwick

Mine just started getting the p0300 codes in the last 2 weeks. 4600 miles.
Not looking forward to doing this job.

Heh, does that mean you have do your own warranty repairs

[cestwick]

Originally Posted by HummBebe

Heh, does that mean you have do your own warranty repairs

Yes I usually do my own Warranty repairs.

Originally Posted by [B

f5fstop] [/b]Not bad with the new repair procedure, using the special tool, and not having to remove the oil pan to remove the front cover.
I've done it three times and each time a little faster...got it down to about eight hours, but that included a few breaks and one long lunch.

Bad part about the tool room at our dealership is actually finding a tool in there. I read through the procedure and it doesn't look to bad but I am the main "suspention/alignment" guy at our store and usually get interrupted several times on bigger jobs to do alignments and "set toe" jobs.

[f5fstop]

Originally Posted by cestwick

Yes I usually do my own Warranty repairs.



Bad part about the tool room at our dealership is actually finding a tool in there. I read through the procedure and it doesn't look to bad but I am the main "suspention/alignment" guy at our store and usually get interrupted several times on bigger jobs to do alignments and "set toe" jobs.

The tool to hold the chain in place is new, so they probably haven't had the time to lose it...yet. The valve spring compressor tool, that's been around a while so it might have magically disapeared.
I hear that is the biggest problem for many techs...special tools. Good luck...

[montanah3]

f5fstop
Does this bulletin apply to #3 only, or do I have to worry about having problems with the others. I doubt my local GM has the new tools for a "quick fix", they said to expect 2/3 day repair. Oh well--one of the drawbacks for living in a small population area.

[f5fstop]

Originally Posted by montanah3

f5fstop
Does this bulletin apply to #3 only, or do I have to worry about having problems with the others. I doubt my local GM has the new tools for a "quick fix", they said to expect 2/3 day repair. Oh well--one of the drawbacks for living in a small population area.

Applies to all on that same engine family, including the 4.2L I-6 and the truck I-4; irregardless of what vehicle it is installed in. As with most OHC engines, the front cover must be removed to removed the cylinder head and to re-install the timing chain. However, on these engines, to remove the front cover, the oil pan had to be removed, as well as all the suspension, drive axles that are under the oil pan. Added about 6 hours to the job.
The new tool allows the tech to retain the chain inside the front cover, thus allowing the cylinder head to be removed a lot faster.
Three days is about the right time. Chances are a smaller dealer does not keep the new cylinder head in stock, plus they have to switch the valves/springs, etc,; from the old head to the new head.
So, a lot of that 3-day time might be waiting for parts; which I believe are readily available from GM service parts.

[f5fstop]

Originally Posted by cestwick

Mine just started getting the p0300 codes in the last 2 weeks. 4600 miles.
Not looking forward to doing this job.

Not bad with the new repair procedure, using the special tool, and not having to remove the oil pan to remove the front cover.
I've done it three times and each time a little faster...got it down to about eight hours, but that included a few breaks and one long lunch.

[montanah3]

8600 miles, but started getting the light at about 6000. Brought it to several GM dealers for code. They said it was a misfire, but didn't seem to care about doing anything. Fortunately found a local dealer who will work with my Hummer dealer (across the state) on getting all done under the warranty.

[wpage]

Non Hummer type?