Engine is all stock. Just wondering how much torque I should torque it down with. Let me know. Thanks!
How much torque should I torque a 2mm HKS headgasket?
- Thread starter idoke
- Start date
Stock bolts or ARP? Need to know previous torque value if stock bolts are re-used and studs or bolts if ARP is used.
You do know the head/block decks have a specific RA (smoothness) spec when using a metal HG? This requires machine work. The HKS requires the lowest value (most smooth) of the MHG's I know about.
You do know the head/block decks have a specific RA (smoothness) spec when using a metal HG? This requires machine work. The HKS requires the lowest value (most smooth) of the MHG's I know about.
Aprox 72 ft/lbs with stock, unused head bolts using moly lube.
80 ft/lbs with ARP studs using moly lube after 5 initial retorques (this means tightening down in sequence per the TSRM instructions, in 5-3 increments, until final torque specs are achieved, loosen in order, start again. Do this about 5 times.)
ARP bolts... Don't know that one, John does though
.
The torque specs are same regardless of the thickness of the head gasket you use.
80 ft/lbs with ARP studs using moly lube after 5 initial retorques (this means tightening down in sequence per the TSRM instructions, in 5-3 increments, until final torque specs are achieved, loosen in order, start again. Do this about 5 times.)
ARP bolts... Don't know that one, John does though
.The torque specs are same regardless of the thickness of the head gasket you use
.
LOL! I was gonna do ARP but decided to go stock bolts. (0>$$$) My budget is a little tight. My mechanic says the stock bolts and studs are fine but he does not know how much he should torque it down with the 2mm gasket. Thanks you guys! Gonna have it done this sunday! My poor baby boo...... i'm gonna fix you right up.....along with everyone here that contributed. I'll use that duct tape that IJ recommended! LOL!
I'll use that duct tape that IJ recommended! LOL!
Get the ARP's! I would not recommend re-using your old bolts. Not saying it won't work, but if you spent the money for MHG and proper machining(?) on the block and head why would would you cut a corner here???
idoke said:LOL! I was gonna do ARP but decided to go stock bolts. (0>$$$) My budget is a little tight. My mechanic says the stock bolts and studs are fine but he does not know how much he should torque it down with the 2mm gasket. Thanks you guys! Gonna have it done this sunday! My poor baby boo...... i'm gonna fix you right up.....along with everyone here that contributed.
This statement alone would make me nervous in taking advice from this mechanic. I agree with Techno Supra, no reason to cut a corner here, unless you bought new OEM headbolts, those could be okay.
You never mentioned it but did you take the head and block to the machine shop to get decked? Without proper machine work for a metal headgasket, youre wasting your time and money.
Hey I keep seeing the "ARP hardware comes with torque specs" but my set of ARP bolts only came with the chart that is printed on the back of the box of the ARP bolts. And that chart does not include M12X1.25 (size of block threads, correct?) so, in theory mine did not come with torque specs.
Edit: just pryed the old box out and it doesn't list ANY 12mm bolt thread size. I distinctly remember running a 12mm bottom tap through the block threads, I just can remember what it was exactly. Maybe the engine internal expert can verify the size of the block threads.
Edit: just pryed the old box out and it doesn't list ANY 12mm bolt thread size. I distinctly remember running a 12mm bottom tap through the block threads, I just can remember what it was exactly. Maybe the engine internal expert can verify the size of the block threads.
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Frank - the head bolt threads are indeed M12x1.25...I just measured one to be certain.
If your bolts did not come with a spec sheet, it was an oversight...ARP usually includes a spec sheet with their hardware. Here is the latest one for the bolts...look at Note B for aluminum heads, it limits torque to 75 ft/lbs w/ moly lube. Studs do not have this limitation.
If your bolts did not come with a spec sheet, it was an oversight...ARP usually includes a spec sheet with their hardware. Here is the latest one for the bolts...look at Note B for aluminum heads, it limits torque to 75 ft/lbs w/ moly lube. Studs do not have this limitation.
Thanks jdub!
I knew I had a photographic memory.
Looks like I'm nice and safe with 70ft/lbs. The funny thing is I stopped because I thought it "felt" right and any more torque would cause harm. And all this time the max is 75.
Thanks again.
I knew I had a photographic memory.
Looks like I'm nice and safe with 70ft/lbs. The funny thing is I stopped because I thought it "felt" right and any more torque would cause harm. And all this time the max is 75.
Thanks again.
My mechanic has his shop by his house. He knows about it and knows that the head and block must be resurfaced before doing anything else. He is a certifield toyota mechanic. He knows the OEM manufactured torque but to a 2mm metal headgasket, that's a whole different headgasket to him. It's much MUCH thicker than the stock one which concerned him to how much torque it should be torqued. I'm using new OEM bolts and studs. Thanks for contributing everyone!
Hey you keep saying OEM bolts and studs. Well you either have bolts or studs, not both. OEM is bolts. ARP make a kit with bolts and a kit with studs/nuts.
It's my understanding that the thickness of the head gasket has no effect on torque values, but has all of its effect on cylinder compression. For example, you would torque ARP BOLTS to 75ft/lbs no matter what kind of head gasket you use, 1mm, 1.2mm, 2mm, etc. Same with studs.
The fasteners determine the torque value to be applied. Not the size or material of the head gasket. The condition of your sealing surfaces determine what material you use for a head gasket. And the amount milled off your head and block determine the thickness of your head gasket.
It's my understanding that the thickness of the head gasket has no effect on torque values, but has all of its effect on cylinder compression. For example, you would torque ARP BOLTS to 75ft/lbs no matter what kind of head gasket you use, 1mm, 1.2mm, 2mm, etc. Same with studs.
The fasteners determine the torque value to be applied. Not the size or material of the head gasket. The condition of your sealing surfaces determine what material you use for a head gasket. And the amount milled off your head and block determine the thickness of your head gasket.
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Actually Chris was correct above...80 ft/lbs w/ moly for studs.
The most recent ARP stud spec sheet:
starscream5000 said:Aprox 72 ft/lbs with stock, unused head bolts using moly lube.
80 ft/lbs with ARP studs using moly lube after 5 initial retorques (this means tightening down in sequence per the TSRM instructions, in 5-3 increments, until final torque specs are achieved, loosen in order, start again. Do this about 5 times.)
ARP bolts... Don't know that one, John does though
The torque specs are same regardless of the thickness of the head gasket you use
The most recent ARP stud spec sheet: