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Username Post: Head Bolts Advice        (Topic#363059)
Posts: 2

Reg: 10-25-20
10-25-20 07:10 PM - Post#2806199    


Car is 2006 Chevy Malibu with a 3.5 V6. According to Wikipedia it's 3.5 L High Value LX9 V6.

I've read a lot of advice about putting Permatex (80019) for example around the threads of my head bolts, but I have a couple of concerns. The first, is that the bolts that I took out, had nothing, even thread lock on them. The second concern is that I used a toothpick and a flashlight to feel out each bolt hole, and they all seemed to bottom out within metal - it didn't seem like water was ever going to touch this bolt. I've already torqued them down.

First question is, did I miss something? The Haynes manual does say to use thread lock, but does not mention "pipe sealer" the way it does for the Intake.

Second question is, if I take them back out, do I now need to replace the head bolts?

Third question is, I think I over-torqued them anyway - I have a huge torque wrench, and the Haynes manual says 22 Ft Lbs, then 150 degrees. So I did that, but with that huge wrench, was still only able to get about 95-115 degrees out of it, after the click. And I pulled really hard - I've learned my lesson in the past, with pulling too hard with a big wrench! Same question as above, did I miss something? and should I take them back out anyway and replace the headbolts and gasket *again* while I still have the engine apart, maybe with a manual torque wrench (the needle kind) this time?

If I decide to loosen the bolts to check or re-do any of this, am I doomed to replace the head bolts?

Thank you very much,
Dan Chase

Edited by dannychase2004 on 10-25-20 07:17 PM. Reason for edit: No reason given.


Member #271 Senior Chevytalk Moderator
Posts: 25313
Loc: Austin, TX 78748
Reg: 05-09-00
11-04-20 08:19 AM - Post#2806971    
    In response to dannychase2004

I would replace any removed head bolt. The thread lock is probably recommended because the block is aluminum.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
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Frequent Contributor
Posts: 2196

Loc: Lake George, NY
Reg: 11-11-15
11-04-20 02:40 PM - Post#2806988    
    In response to dannychase2004

These are "torque to yield" bolts, one time use only.


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