Head bolts
 

Blowen head gasket, replacing it , what would be some good head bolts to put in and that torque should they be at to hopefully prevent this fromt happe ing again .

ARP head STUDS

thats the only way to go. ARP studs are good up to 100ftp thats what i'll be running on mine or close to it.

Supra_87_mk3 - the edit button is your friend, lol

ARP studs. I took mine up to 85 flbs. In 5 settings instead of 3.

have you found any problems with putting so much torque on the block, the fac specs say liek 55 pounds or 65 pounds some thing like that. since you put the new studs in have you had any head gasket problems

g-string....., What up?

Do the studs. Some of these guys actually know what they are talking about and they aren't here to hold your hand.

I went with the studs. I torqued them in five stages. I threw a few 5lb passes in there mixed with 10 lb passes.

I went to 85ftlbs. You are not going to hurt the steel, that is your block.
Make sure you atleast lap your block. Machining the head is a must.

IMO, studs are superior to arp bolts. But that is only an opinion.

Get the tsrm for your car. There is an online tsrm that may be of use to you.
I have the book so I don't know the link but someone does.

here is a tsrm website.
h:tp://www.cygnusx1.net/Supra/Library/TSRM/MK3/default.aspx

Arp studs and headbolts are the two most popular choices. The problem with the MKIII's head gasket wasn't due to anything wrong with the OEM head bolts or the OEM head gasket... it was the low torque rating. The OEM head gasket can take quite a beating when properly torqued.

I'm running ARP head bolts at 75ft lbs (the OEM head bolts will work fine at this level too, but I'd recommend new ones over reusing the 20 year old ones in your car now).

Yes, ARP studs are superior to ARP bolts but the difference between any ARP hardware and stock hardware is far greater than any difference between ARP studs and ARP bolts.

The block is iron, not steel, and is about the strongest material you can thread a bolt or stud into. But it does have its limits. In my opinion anyone that goes higher than 80 ft/lbs is crazy and just asking for trouble (in the form of stripped block threads). Titanmotorsports says use 75ft/lbs for high boost applications. I believe Toyota reissued a torque spec of 72ft/lbs for stock head bolts, and thats with using 30wt motor oil for lubricant on the threads like the TSRM says. That is the biggest factor when torqueing head bolts, what kind of lubricant you use. ARP comes with moly lube that is the slickest lubricant you can buy, far superior to motor oil. It says right on the package that 85% of torque applied to any dry, unplated fastener is lost due to friction between the male and female threads. With motor oil the loss is lower and with ARP moly lube its far lower than with motor oil. Just to put it in perspective, for a 12mm stud (7M's are 10mm thread size studs) ARP recommends 86ft/lbs with ARP moly, and with the same stud with 30wt oil you would need to torque that stud to 109ft/lbs to get the same clamping force. Thats a big difference. ARP doesn't list a torque value for 10mm thread sized 190,000psi tensile strength bolts (the bolts I used) so I just went with 70ft/lbs. For 10mm studs, ARP recommends 60ft/lbs with moly and 70ft/lbs for 30 wt oil.

Factory spec for the headbolts is 58ft lbs with motor oil. http://www.cygnusx1.net/Supra/Librar...ion=EM&Page=55

I SAID they reissued a new torque value and what I meant by "like the TSRM says" is to use motor oil.

I own the TSRM thank you very much. I'm talking about advanced mechanical dynamics here, obviously far beyond your scope of stock head bolt torque. The fact is that 72ft/lbs with motor oil would equal less with ARP moly lube. Thats what I was trying to tell you and I get, "the factory torque spec is 58ft/lbs". We all know that the factory 58ft/lbs is wrong, we don't need a link to the TSRM. I have connections with Toyota dealerships, I get 20% off anything I want along with factory trained technicians to tell me things any other mechanic wouldn't know about, like the reissued torque value.

I think its funny how all these people (sorry supramacist) with non turbo motors are replacing head gaskets with ARP hardware. Those cars should be in the scrapyard. The cost of repairing a head gasket on a non turbo supra far exceeds the value of the vehicle. Shit, even on a turbo motor you are closing in on the vehicles value. Besides, I don't know what you are trying to prove, a stock turbo supra is at best sub par so a non turbo supra is a joke. What a waste of time and money.....

EDIT: Cleaned up and removed most of the negative commentary. My apologies for lashing out.


Yep, full of all kinds of useful info. My car's market value has absolutely nothing to do with it's worth to ME.

EDIT2: I should rephrase this. The Toyota Service Tech's that I know couldn't find any update concerning the torque spec of the head bolts. This isn't just one dealership either, there are three where I've inquired about this. The only reason I give a rat's ass about this is because people taking their car to a Toyota service center for a headgasket may just assume this known issue is being taken into account, when it may very well not be.

Further more, the 7M block has plenty of potential. The only reason half of those that I've seen would classify as "junk" is because people keep cheeping out on them. I don't own a MKIII because I expect it to be fast or cheap. I own this car because I like it. If I want to "dump" a ton of cash into my car I will.

Advice is just like old cars, they are only worth what *you* get out of them.

If you're just getting defensive because I posted a TSRM link well I'm sorry, it wasn't just posted for your benefit.

well heres the thing.. if you mean me saying they can be torced to 100 you would be wrong for doubting me. i do have alot to learn but this is a Quote from the ARP Staff member that wrote me back when i asked if you could torc them to 100ft pounds


HELLO,

THE RECOMMENDED TORQUE IS 75 FT LBS WITH ARP MOLY LUBE, OR 115 W/ 30 WT
OIL. IF THIS TORQUE IS EXCEDED IT COULD DAMAGE THE STUD AND WILL VOID
ANY WARRENTY WITH THE STUD.

PAUL S.

-----Original Message-----
From: Erica Martinez
Sent: Monday, May 21, 2007 11:08 AM
To: pauls@arpfasteners.com
Subject: FW: Website Submitted Question from nick seery


but the edit button is my friend b/c i can't spell so im always changing stuff lol. i wasnt trying to be mean just saying it could be done. the only way i knew this was my buddy works on DSM's and said thats what he does... but you never know we could be wrong... wouldnt be the first time or the last time.

Sorry i didn't read you post in time IHATEHACKS.. you just said that.. but at least that also proves my point that it can be done.. but after reading all of this stuff 80-85ft pound will be just fine for me.

What happened? We all had a bad day yesterday? I cleaned it up a little.

its all good... well this topics dead , i would like some help if you want to comment on my new topic Nos and HeadWork.