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General Auto Tech / Re: Bertha - 08 GMC Yukon XL Denali
« Last post by Steve Wood on December 01 2022, 02:16:22 PM »
My milkcrate skates around like it is on wheels, too
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General Auto Tech / Re: Bertha - 08 GMC Yukon XL Denali
« Last post by nocooler on December 01 2022, 01:06:29 PM »
Top side creeper is going to be a must if I do another one of these. Iím tired of the damn milk crate sliding around the under my feet.
Iím ready to be done looking at this thing, and my body is ready to be done wrenching on it.
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General Auto Tech / Re: Bertha - 08 GMC Yukon XL Denali
« Last post by Steve Wood on December 01 2022, 11:17:56 AM »
Sometimes you get lucky...me, mostly not.

I took much of the stuff off my Miata to make it easy when my son came up and we pulled the diff carrier out to install a rebuilt diff in it.  I figured it would take about three hours to install the new diff and put it back together.  It took us a couple of hours to finish getting the diff separated from the power plant frame that locks the diff carrier into place with regard to the transmission.

Installing the replacement diff into the carrier was easy and getting the assembly back into the car and locked down was not too bad/hard.

Getting the half shafts to pop all way into the diff turned out to be a two day process that I won't bore you with.  Hopefully it now works right.  I cannot find out because when I went to move the Challenger to get the Miata out, the MSD Ready to Fail distributor that had about three hours or so run time on it, blew out the 50 amp fuse in the hot wire and messed up the relay-was showing a dead short.  Seems they have a worse reputation than the rest of their chinese crap they sell.  I am still waiting on stuff to come in so I can install a new distributor and I still have not been able to remove the blown fuse that is now welded into the maxi fuse holder which I guess I have to replace as well.

But that is another story altogether...I was going to buy a top side creeper for working on trucks, but never did.  I cannot stand up under a truck to work on it because 30 seconds later my sciatica is killing me so it's either lay on the floor or sit up under the truck and my four post lift does not leave much room to get to a lot of stuff under the truck...   I think old age really likes to piss me off. :013:
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General Auto Tech / Re: Bertha - 08 GMC Yukon XL Denali
« Last post by nocooler on December 01 2022, 10:45:34 AM »
Here is a picture of the oil pressure relief valve that I removed and plugged.
Steve - I was baffled when I tore it apart and initially didn't find anything. I was expecting a glitter bomb, and all I found was some plastic from the tensioner.
David - Size has been a problem, the engine is so far down in this body style that it makes it a bitch. Hell by the time I get the thing high enough to get under it, I can't even reach what I needed to work on anymore. If I could get the a/c condenser out of the way it would open things up, as I could remove the core support.
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General Auto Tech / Re: Bertha - 08 GMC Yukon XL Denali
« Last post by Just a Six? on November 30 2022, 07:36:06 PM »
That's a big job & they're hard to work on with the truck so high up but looking good! More than I would want to tackle myself. Your buddy will have a great truck again.  :cheers:

I got my 04 off a long lease & now has just under 200k miles almost all hiway so it runs good but lots of salt abuse means lots of rust too. I did repairs around the wheels this summer & then sprayed a few rattle cans of assorted black & I ended up using the Rust Check Gloss Black & gave it a little buff. Looks decent enough for me.
   
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General Auto Tech / Re: Bertha - 08 GMC Yukon XL Denali
« Last post by Steve Wood on November 30 2022, 07:19:50 PM »
I had forgotten about this one.

It is amazing how frequently these things arise these days and one has to wonder if the shop was just smart enuf to know they did not know what they were doing, or if they just took the easy way out because they figured it was easier to replace the engine and make some serious money without perspiration.

He was lucky he knew you and it is getting fixed as well as being done correctly to head off future potential problems.  That is the second time in the last 15 years, that I have seen a stuck open bypass valve.

It's a lot of work to do some of this stuff but I find it way more satisfying to have figured it out.

good job! :cheers:
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General Buick Tech / Re: Update on future build
« Last post by Steve Wood on November 30 2022, 05:25:41 PM »
Another sorry to hear about that.  Hope it is a minor problem!
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General Auto Tech / Re: Bertha - 08 GMC Yukon XL Denali
« Last post by nocooler on November 30 2022, 01:52:00 PM »
Basically - I'm re-gasketing/sealing the engine. New oil pump, lifters, valve spring/seals, VVT cam phaser, timing chain, tensioner, and plugging the bypass in the oil pan.
Since I had it tore so far apart I decided to split the engine/trans and replace the rear main seal and the rear cover gasket just to make sure everything is fresh.
It's back together waiting for a valve spring tool to show up since the ls1 and ls3 style heads use different spacing for the rocker stands/valves.
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General Auto Tech / Re: Bertha - 08 GMC Yukon XL Denali
« Last post by nocooler on November 30 2022, 01:46:10 PM »
Although I was surprised that everything looked good - until I found this.
The 6.2 has VVT but not DoD/AFM so it uses this style tensioner - and it broke. Luckily he only put 20 miles on it like this. The low oil pressure problem was due to a stuck oil pressure relief valve in the oil pan.
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General Auto Tech / Bertha - 08 GMC Yukon XL Denali
« Last post by nocooler on November 30 2022, 01:42:56 PM »
So this is owned by a good friend of mine. It's had a low oil pressure at idle for quite some time and then started making some interesting noises. We both thought it had got a lifter and his normal mechanic shop said they'd change the engine for $6500 but other than that they wouldn't touch it.
The tear down went smooth - broke one exhaust manifold bolt off in the head and a manifold stud.
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