opfor2
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Is there any way to determine if my 2011 has the new improved valve cover per GM TSB# 10-06-01-008M without actually removing the cover?
Drivers side valve cover
- Thread starter opfor2
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@Doubeleive may know.
You might be able to tell by the pcv hole location, maybe..... You would have to compare a photo of them side by side and not sure if you can tell from the topside or not
swathdiver
Full Access Member
When was the truck built? If memory serves, the new valve cover design was introduced in March 2011. Search the forum or GM TSBs to be sure.
The part number for the new one is 12642655 for 2009+. The earlier years use a different diameter PCV and consequently a different part number.
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opfor2
Full Access Member
If I go by the emissions sticker that is located on the driver's side door it has a date of November 2010, so I think I'm in need of a new valve cover.
donjetman
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The TSB link I provided you has part #s and pictures of the original & updated valve covers.
Here's a pic of mine. Round hole bad, square hole good.
Here's the TSB again: https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf
swathdiver
Full Access Member
Yep, right in Don's post of the TSB, it says February 1st, 2011 for the valve cover and October 2010 for the AFM shield in the oil pan.
I have the new cover but not the shield in my pan.
That TSB is an interesting read. I was a little bit shocked to read that when addressing oil consumption issues, and when they replace pistons and rings they are stating it is not necessary to hone the cylinder walls. Then in the same section, it mentions it might take two or three thousand miles for the rings to seat.
(!!!) The stated reason for this is simply because if the is hone incorrectly, it can damage the rings for whatever, especially if the cylinders work cleaned properly afterwards. Are you kidding me? Is this how the dealerships work on engines? Very glad now I have never let a dealership into any engine I've had.
Also, I think the dates on the TSB are questionable. When I did the AFM delete on my wife's 2014 Escalade, there is no deflector on the oil pressure relief valve. Never had any oil consumption, so maybe they figured out it's not necessary? 168,000 mi now, AFM delete done at 142,000 mi, mobile one 5W-30 every 3500 to 4500 miles since new. It's had an oil bypass filter for almost 100,000 miles.
I firmly believe the oil consumption issues were directly tied to the PCV system and fixed with the updated valve cover. Our 2003 Hummer H2 with the lq4 engine, 118,000 miles, was using about a half a quarter of oil every 3,000 miles.... Until I updated the valve covers at 112,000 miles. Absolutely no oil consumption since then.
(!!!) The stated reason for this is simply because if the is hone incorrectly, it can damage the rings for whatever, especially if the cylinders work cleaned properly afterwards. Are you kidding me? Is this how the dealerships work on engines? Very glad now I have never let a dealership into any engine I've had.
Also, I think the dates on the TSB are questionable. When I did the AFM delete on my wife's 2014 Escalade, there is no deflector on the oil pressure relief valve. Never had any oil consumption, so maybe they figured out it's not necessary? 168,000 mi now, AFM delete done at 142,000 mi, mobile one 5W-30 every 3500 to 4500 miles since new. It's had an oil bypass filter for almost 100,000 miles.
I firmly believe the oil consumption issues were directly tied to the PCV system and fixed with the updated valve cover. Our 2003 Hummer H2 with the lq4 engine, 118,000 miles, was using about a half a quarter of oil every 3,000 miles.... Until I updated the valve covers at 112,000 miles. Absolutely no oil consumption since then.
I've pretty much always felt that way.... But after reading that TSB, that absolutely confirmed it. GM's logic is clearly messed up. It's like advising against having the cylinder head resurfaced in case the machine shop screws it up, and just go with what you have! Incredible to actually read such instructions on the cylinder prep...
