Gmt900 Afm Tsb
Feb 24, 2008 | 10:30 AM
#11
TECH Apprentice
Joined: Mar 2007
Posts: 390
Likes: 3
From: Alberta
Yea i agree 100%. Most customers dosent change their oil when they should. let alone check for any strange noises. Dod be ok i think if they could do some more work on it and get it staying in longer on highway. I contacted GM before my cam swap to see what the specs were on the 8 DOD lifters and they wouldnt acknowledge anything on them and said they do not reccomend and performance upgrades on their motors. But It would have probally been smart of me to go ahead and replace the lifters. One thing i have had on my mind...My truck has the all aluminum block, would aluminum dissipate noises better then the steel block?.....
One more thing i wish they would replace the seats in my truck...they collect lint and look awfull. I have the black cloth seats.
One more thing i wish they would replace the seats in my truck...they collect lint and look awfull. I have the black cloth seats.
Aluminum doesn't hide noise as much as cast iron would (if going from iron to aluminum intake often you would hear more valvetrain noise, etc) but not sure about blocks themselves...would guess they would transfer noise more easily but it depends on the material used, design, etc.
There was a TSB about the lint on the seats. They are working on a replacement material I beleive, I'll see if I can find it for you.
Feb 24, 2008 | 10:47 AM
#12
TECH Apprentice
Joined: Mar 2007
Posts: 390
Likes: 3
From: Alberta
Here it is, I never saved first version as it dealt with black cloth seats only (my interior is titanium) and it referenced changing out the seat covers, but this is the latest one...looks like they are still working on a fix of some sort.
Feb 24, 2008 | 01:02 PM
#13
Thread Starter
On The Tree
Joined: Jul 2007
Posts: 113
Likes: 0
My 07 nnbs Has bes getting a tick at start up, but as far as getting worse it isnt. When the truck is cold idiling there is a tick, You can rev it to about 3000rpms and it will go away. oil pressure is good at high rpms and cold idiling. I kinna think its something to do with the aluminum block in the 5.3's but if the 6.0's are doing it to then its probally a defect in the lifters.
FYI, The 6.0's in the 1/2 ton GMT900's (L76) are all aluminum too.
Mine only does it on really cold starts and it goes away within a minute. Unless it gets worse, I am not going to worry about it.
Feb 24, 2008 | 02:35 PM
#14
Thats me, I think it has alot to do with the weather, It gets real noticable when i start it up in the mornings if i dive it to work, Coldest it has been here is about 15deg F. I should be able to tell more about it when warm weather hit. If i leave it in my heated garage, on startup you will heard about 1 or 2 ticks and all is fine after that. Truck has 12,5xx miles on it now. By the way nice truck... mine is a white Crew Cab Z71
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