head retorque questions
- Thread starter Boosted516
- Start date
CajunKenny;1301708 said:
im guessing oem but i have the reciepts the guy gave me ill check them tomoro
I hate to say it bro; but, there is a LOT of guess work going on here. That could end in disaster!
CajunKenny;1302547 said:
with bolts or the hg? if i have to ill just buy arp bolts because id rather spend some money then get a bhg and have to pay more
rayall01;1301662 said:
Somehow I doubt it....
You got the run of the mill intermediate tap. Those are a dime a dozen.
BOTTOMING taps on the other hand. I had to special order this type of tap from fastenal. NO ONE ever carries these are they are only used by specialized machine shops. Throw in that this particular taps is HSS and the price goes up even more. Right tool for the right job!
http://en.wikipedia.org/wiki/Taps_and_dies
bottoming tap not to be confused with the run of the mill Intermediate taps sold by Sears, Home Depot, Ace Hardware, Northern Hydraulics etc.
I really wouldn't ever under any circumstance try swapping bolts without pulling the head. I'd be constantly worried one of the new ones had too much gunk built up to be properly torqued. It doesn't take that long to do, if you're gonna bother do it right. Retorque it as is and leave it be. If it blows, do it right. Don't half ass it now, you'll end up redoing it later anyway...
figgie;1302711 said:
Well, it's a bottoming tap that matches what I was taught about bottoming taps, and it's worked well in the past. I'm sure yours is better, but a lot of people don't have 65.00 to spend on a tap. I'll have to stick with mine I guess.
Hey figgie, I just looked at your wiki link, and see that mine is a plug tap. I'm thinking a judicious use of grinding, and I could get my tap to approximate what you have.
Boosted516;1299450 said:
I retorqued my bolts on the 7mgte and have not had a problem but... the stock bolts are torque to yield bolts and i'm told they don't do too much more than their stock spec. Instead they stretch because apparently that's what they are designed to do.
supramang;1302798 said:
Bzzzzz...WRONG!
Stock head bolts are not torque to yield. If you look in the TSRM, they are not marked for replacement when removed. They have been tested by Reg Reimer for torque at 68-72 ft/lbs. The 7M bolts are identical material to the 2JZ head bolts and have a yield strength of 147,000 psi. For comparision, ARP 7M head bolts have a rated yield strength of 200,000 psi.
Next time you post in the Tech section get your facts straight before you post. "I heard" or "I'm told" does not cut it.
rayall01;1302793 said:
ummmm
I would be careful! taps usually don't grind well. they shatter very good though.
Ryan
i am not sure if i told you they were torque to yeild because I don't recall but they are not. basically TqTY, use once. throw away. Can not be reused, need very special equipment etc.
i am not sure if i told you they were torque to yeild because I don't recall but they are not. basically TqTY, use once. throw away. Can not be reused, need very special equipment etc.
jdub;1302826 said:
Sorry Man! I just happened to have this conversation with a mechanic at toyota a few days ago who owns a supra and that's the info he gave me. No need for the battle ax
supramang;1303030 said:
I am coming over an pimp slapping ya with some talc on my hand...
Dunno why the dork would say that.. anyway, Why where YOU at the toyota stealership????
Boosted516;1302703 said:
Both!
You're talking about the weakest link in the 7M here! It's not a matter of if you'll get a BHG...it's a matter of when! Knowing all you can know about the rebuild is the key. ESPECIALLY, when it comes to the Head Bolts and Head Gasket.
If the rebuild was done right with the right parts, you may just very well dodge that BHG bullet.
CajunKenny;1303090 said:
i know the head was rebuilt and resurfaced, and the hg was replaced. it may already be torqued down to 72ft lbs, but im not sure and want to be safe. what else can i do here other than pulling the motor apart, getting a metal hg and studs?
jdub;1303223 said:
ok looks like im just gonna do a retorque. thanks again jdub. in the cygnus write up it says to replace valve cover gaskets. im just wondering what kind, cause theres ebay ones for like $10 and felpros for $18 or is there a better brand i should look for?
The Felpros are good...I got my replacements at NAPA. Came with the hold down grommets too. Hasn't leaked in 2 1/2 years.