What did you do to your NNBS GMT900 Tahoe/Yukon Today?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

07Burb

GM fan for life
Staff member
Administrator
Supporting Member
Joined
Jan 3, 2011
Posts
49,908
Reaction score
15,449
So over the last week I am getting large puffs of blue smoke out the tailpipe at start (mostly in the morning after sitting all night). Looking like I may be due for some valve seals :(
So thinking more on this...can someone confirm for me that the part number for the upgraded valve cover design is 12570427? I’m wondering if they PCV system is possibly clogged and causing my smoking problem. I’m getting almost no oil in my catch can :hmm:
 

swathdiver

Full Access Member
Joined
May 18, 2017
Posts
19,104
Reaction score
25,036
Location
Treasure Coast, Florida
So thinking more on this...can someone confirm for me that the part number for the upgraded valve cover design is 12570427? I’m wondering if they PCV system is possibly clogged and causing my smoking problem. I’m getting almost no oil in my catch can :hmm:

Don't know if its new but that is what the catalog shows at GMPartsGiant.
 

07Burb

GM fan for life
Staff member
Administrator
Supporting Member
Joined
Jan 3, 2011
Posts
49,908
Reaction score
15,449
Is there just one updated valve cover, I could have swore I read somewhere there was two updates.
I thought one but I could be wrong. It’s why I asked. I know I’ve seen it posted and I think it was in this thread :hmm: I thought it might have been @iamdub who posted about it :think:
 

CHOO CHOO

BackPagePhil
Joined
Feb 21, 2011
Posts
12,787
Reaction score
5,032
Location
Manheim, Pa
So I just watched a video for the updated valve cover and it looked waaay to easy. Is there anything I'm missing that I would need to do besides just pop the cover off and place the updated one back on? Or am I overthinking it. Would I need to clean anything, oil, new seals, etc? It just looked super simple.
 

wjburken

Supporting Member
Joined
Dec 26, 2017
Posts
9,709
Reaction score
26,308
Location
Eastern Iowa
So I just watched a video for the updated valve cover and it looked waaay to easy. Is there anything I'm missing that I would need to do besides just pop the cover off and place the updated one back on? Or am I overthinking it. Would I need to clean anything, oil, new seals, etc? It just looked super simple.

It’s that easy.
upload_2019-11-20_22-59-36.jpeg
I’d replace the valve cover gasket
 

swathdiver

Full Access Member
Joined
May 18, 2017
Posts
19,104
Reaction score
25,036
Location
Treasure Coast, Florida
Is there just one updated valve cover, I could have swore I read somewhere there was two updates.

Well, there are two and it depends on the size of the hose fitting which I think one design is for the 2007-2008 engines and the other is for the 2009+. But, don't you have a 2013? I thought you did and if so, should already have it as the update was done around April 2011.

Mine took the updated one with PN# 12642655.
 

CHOO CHOO

BackPagePhil
Joined
Feb 21, 2011
Posts
12,787
Reaction score
5,032
Location
Manheim, Pa
Well, there are two and it depends on the size of the hose fitting which I think one design is for the 2007-2008 engines and the other is for the 2009+. But, don't you have a 2013? I thought you did and if so, should already have it as the update was done around April 2011.

Mine took the updated one with PN# 12642655.
Mines an old pos 2007. I'd take a 13' though!
 
Top