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.

avalonandl

Full Access Member
Joined
Apr 6, 2019
Posts
2,200
Reaction score
2,635
Location
Troy, MICH & Naples, FL
Replaced the valve cover gasket on driver's side this weekend. Easy job. Nasty smelling burnt oil on the inside of valve cover. I ripped 1 of my new cover bolt grommet however by seating the grommet in the valve cover first then trying to push the bolt through, so have to order a new set (only 8 in the package, Mahle brand ones) in order to do the passenger side. I had better success by putting the grommet on the bolt first and then pushing the entire assembly through into the valve cover. Ribbed-side of the new GM OEM gasket goes into the valve cover groove. Also be weary of all the brittle plastic wire loom so that it doesn't fall into your valvetrain while removing and re-installing the valve cover : )

Valve cover bolts torque to 106-inch lbs.

View attachment 418370

View attachment 418371

View attachment 418372
Nasty looking
 

blackelky

Full Access Member
Joined
Oct 15, 2023
Posts
582
Reaction score
763
Replaced the valve cover gasket on driver's side this weekend. Easy job. Nasty smelling burnt oil on the inside of valve cover. I ripped 1 of my new cover bolt grommet however by seating the grommet in the valve cover first then trying to push the bolt through, so have to order a new set (only 8 in the package, Mahle brand ones) in order to do the passenger side. I had better success by putting the grommet on the bolt first and then pushing the entire assembly through into the valve cover. Ribbed-side of the new GM OEM gasket goes into the valve cover groove. Also be weary of all the brittle plastic wire loom so that it doesn't fall into your valvetrain while removing and re-installing the valve cover : )

Valve cover bolts torque to 106-inch lbs.

View attachment 418370

View attachment 418371

View attachment 418372
Soapy water helps with the grommets. I need to this when it gets warmer out. They're not leaking but 103k miles probably will soon
 

Fless

Staff member
Super Moderator
Joined
Apr 2, 2017
Posts
11,634
Reaction score
23,609
Location
Elev 5,280
@iamdub posted what looks like a good way to install the grommets in this post:

 

Runfor5

Member
Joined
Jan 29, 2022
Posts
73
Reaction score
200
Location
Northern VA
@iamdub posted what looks like a good way to install the grommets in this post:

That's good! Nice write-up. I watched this video a couple times too beforehand, literally same exact steps on the 6.2:

 

Geotrash

Dave
Supporting Member
Joined
Feb 16, 2018
Posts
6,330
Reaction score
15,637
Location
Richmond, VA
Purchased a new set of GM oil cooler lines (part #84828848) this morning, mine are leaking at the rubber flex lines up front near the radiator. Not looking forward to doing the actual work though haha
When I did mine, I took the opportunity to replace the drivers side motor mount. Makes both jobs easier. I also took off the left front wheel and the fender liner.
 

Runfor5

Member
Joined
Jan 29, 2022
Posts
73
Reaction score
200
Location
Northern VA
When I did mine, I took the opportunity to replace the drivers side motor mount. Makes both jobs easier. I also took off the left front wheel and the fender liner.
Not a bad idea on the motor mount. Did you also have to unbolt the front driveshaft for access, if you recall?
 

Forum statistics

Threads
131,814
Posts
1,857,413
Members
96,123
Latest member
jchavez95

Latest posts

Top