New to Supra's had a few Q's

[cre]

The problem really never was the head gasket; Yes, it has changed... the rings and jackets are all about 1mm beefier and I'm sure the materials have advanced as well.... But if you really think about it the average MKIII HG lasted 15+ years.

Sure, on a clean engine with a perfect deck and head the composite could take more than that. It's a matter of longevity though. Everything breaks, some things sooner than others. I wouldn't really go more than 12psi on a daily basis for the sake of the HG either. Whether it MIGHT hold up better than a lot of other people have experienced isn't something I like to bet my own engine on; I've been bit in the ass that way a few too many times in the past.

On a related note, when prepping for a composite head gasket you do not want a "smooth as glass" surface. Unlike the MLS HG the composite does better if it has the additional surface area and 'bite'.

[My88isGREAT]

Yes CRE, right again, the head bolts were not torqued good enough causing the head gasket to blow... All I know is I was told that the new OEM head gasket are much better then the original ones and there should be no problem if your not trying to boost the heck out of it. Also with ARP bolts torqued to 115 foot lbs, that bitch is not going anywhere.

[cre]

Originally Posted by My88isGREAT

Also with ARP bolts torqued to 115 foot lbs, that bitch is not going anywhere.

Except that that's miles beyond ARP's rating and most likely beyond their yield capacity... No, stretched out head bolts aren't going to do anything except possibly warp the head (which isn't very beefy, I'm pretty sure I've posted pictures of a cross cut head before). You've got a load of reading and studying to do.

For the record, the torque for head bolts (ARP orToyota) should not exceed 75ft lbs (when properly lubricated with a good moly grease and the threads in the block properly chased) and studs no more than 95ft lbs. At this level there is still elasticity in the fastener and there will naturally be a small safety margin (both of which I suspect you're past)... They're made this way for a reason.

[My88isGREAT]

OK, check this out dude the head is plenty beefy. But you call this number right here 805-339-2200 and ask them what their head BOLT torque specks are for 7mgte. I even called to double check to make sure the paper was right. http://www.toymods.org.au/forums/sho...s-Torque-Specs
or
http://www.supraforums.com/forum/sho...torque-on-them
Tell me what they said. What car do you have and what are you running in it? Did you do all the work yourself of did you pay someone else to do it for you??

[cre]

I don't need to call them....

From your own link:
80 ft/lb with moly <---- holy crap! Even other people know!
120 with 30 weight oil.

That post is still high, but barely so. The ARP come with moly grease so unless you're using used fasteners and too cheap to get good lube you'll be using moly.. and thus... 75ft lbs. That also happens to be the approximate ISO specification for the fastener type and size.

[Looking at the wrong spec, I'll see if I can dig up the instruction sheet from a set] Actually, if you look at their website ARP specifies 50ft lbs (a revision which I'm surprised to see... I can probably dig up a couple old install sheets if I haven't thrown them out when I last cleaned): http://www.arp-bolts.com/instructions/203-6004.pdf [<--Spec for the rod bolts; See edit below.] US ISO for that fastener dimension is 72ft lbs.

I already said that I think I've posted a picture or two of a dissected 7M head, unless you've done the same don't go on about how "beefy" it is.

I haven't paid another mechanic to work on a car of mine in decades... I generally get paid for fixing other people's cars.... any other questions? Here's a hint, say no, I'm ready to make you the second person I've ever banned from this site.... you're really pissing me off.


EDIT: Scratch that on the spec sheet... just realized that was their rod fasteners... I thought that was weird. I'll dig up the head bolt specs in a bit.

EDIT2: There isn't an online guide for ARP 203-3902, but it you just Google "7M-GTE torque spec" you'll get a few THOUSAND hits (many of those from people who catually bought the hardware and READ the instructions stating between 70 and 80... I'm pretty sure it was 72 or 75 but it sure as shit isn't 115+, not on a new install and not using professional assembly lubricants.

If you're retorquing, the fasteners are unlubricated at all really and any torque reading you see is not to be trusted at all; They will generally be significantly higher than actual.

[907mge]

I belive when I put in my in my arp head studs the spec was 90ftlbs, and the studs have a higher spec than the bolts do.

[cre]

Originally Posted by 907mge

I belive when I put in my in my arp head studs the spec was 90ftlbs, and the studs have a higher spec than the bolts do.

Yeah, I thought studs were 90 too... I'll look for another instal sheet for studs, this one was posted by another MKIII owner and he says it's from his kit.

[cre]

That measurement at the site you linked to is FOR STUDS (which have a much higher torque than bolts):

80ft lbs with moly, 120ft lbs with regular 30wt oil. Here's a scan:



I'll look to see if I have one for bolts lying around when I have the time and think on it.

Now if you're saying 115ft lbs when using oil you need to specify; ARP bolts come with much better lube and as such if someone doesn't understand and torques to that level they will destroy the fasteners and risk damaging the head.