Valve cover grommets Q

[icey756]

Well i think its overdue that i get my own torque wrench anyway so I'll do some more research. When I got the studs thats what they said to torque to i think. Maybe it is a typo but i would have to double check. Pretty sure i made 3 passes of 30, 60 and then 90

[cre]

Originally Posted by icey756

When I got the studs thats what they said to torque to i think. Maybe it is a typo but i would have to double check. Pretty sure i made 3 passes of 30, 60 and then 90

We've covered this. There IS a difference depending on whether you installed studs or bolts just as the type of lube makes a difference. If you installed studs and used the supplied moly grease then you've done well and need not worry... Bolts on the other hand you would only torque to 90 if you used motor oil in lieu of a good moly lube. Follow?

[icey756]

yes i follow. And sorry i mean i have bolts not studs. We just used the stuff they gave us and torqued them to 90. No oil involved. Why is that a big deal?

[cre]

Google fasteners and yield strength. The head isn't designed for that level of torque (hell, your rims aren't and they have a beefier cross section) and the fasteners are designed to remain within a certain margin to maintain a specific level of elasticity.... Who told you to just "go ahead"? If it was in a thread on here let me know so I can remove it. If Toyota designed for using torque to yield fasteners (aka TTY) you'd be in real deep shit.


EDIT: On second thought don't Google it, you'll find all the bad info first. Go buy some mechanical engineering texts and start studying.... or read the directions next time (they're not included because the manufacturer is bored).

I posted a little more on this here: http://www.toyota-supra.info/forums/...ad-gasket.html ...and a lot more on the subject in the past.

[icey756]

what do u suggest i do then? Loosen them or what?

[cre]

Either way it's a gamble now. Compromised head or compromised HG either way if it fails you're going to have to redo the job. I'd also be disinclined to reuse those bolts in the future whether they measure to spec or not. Loosening the fasteners that much is sure to compromise the HG's seal.

Myself, I'd redo the job but then I can get through it quickly. You can try and just ride it out a few people have done so without issue... and some have the head crack on them the head. Your odds are still better than those who toss a MHG on an unmachined block (although that's not saying much as that fails 90% of the time and you've probably got better than a 50/50 shot of things working out fine). You're not going to lose much if you try to ride it out and you can get a replacement head from a GE for little money; You'll need to re-shim the lifters when you swap over the intake cam but you should do those on both sides anyway.

Did you use moly when installing the bolts? Did you chase the threads in the block as directed? If you answer no to either of these well you may be in good shape but in bad shape for another reason.

Why don't people read the manual? These aren't made of Legos and nothing close to as simple as hanging drywall.

[cre]

I'm not trying to present an overly grim picture for you... but I'm definitely not going to portray it as something which is just fine and dandy... it's not and something may go wrong and cost you a good amount of time and money (and no one but you will be the least bit surprised).