Head bolt torque

kjhsupra · 03-23-2006, 11:05 PM

I have an 86 1/2 NA 5sp with another blown head gasket. I have heard that people are using head bolt torque setting of 68-70 lb-ft instead of the factory 58 lb-ft, is this a good setting? I checked with Toyota and they did not have any service bulletin for this new torque setting. Also for head bolts are most people cleaning and re-using, replacing or going to the expensive ARP stud kits?

mrnickleye · 03-28-2006, 04:54 AM

Always use new bolts ($40 from Toyota) when the head is going back on. Use motor oil on the bolt threads.

72 lb ft of torque seems to be the 'universal' setting these days. It's enough to work good (eliminate BHGs), and not too much to cause any damage, or break a bolt.

Or you can spring for some after market studs. Just do a search here and you'll find a few threads on this. Use their lube on the threads, and torque th their specs.

Benesesso · 04-06-2006, 03:54 AM

Why do you advocate using motor oil on the threads? A good moly lube with a high % of moly has a LOT less friction under the very high contact stress of the threads and under-head areas. Less friction means higher preload and less preload scatter. ARP supplies a good moly lube with their bolts for good reason.

You have a lot of Supra knowledge, so I'm curious about the oil reco.

suprra_girl · 04-06-2006, 09:19 AM

i believe its because different companies moly lube applies different torque to each bolt

i don't know the fancy words for it but i think that's it?
anyone else? lol

03-23-2006, 11:05 PM	#1
kjhsupra Stock Join Date: Mar 2006 Location: St. Louis, MO Posts: 1	Head bolt torque I have an 86 1/2 NA 5sp with another blown head gasket. I have heard that people are using head bolt torque setting of 68-70 lb-ft instead of the factory 58 lb-ft, is this a good setting? I checked with Toyota and they did not have any service bulletin for this new torque setting. Also for head bolts are most people cleaning and re-using, replacing or going to the expensive ARP stud kits?

03-28-2006, 04:54 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Always use new bolts ($40 from Toyota) when the head is going back on. Use motor oil on the bolt threads. 72 lb ft of torque seems to be the 'universal' setting these days. It's enough to work good (eliminate BHGs), and not too much to cause any damage, or break a bolt. Or you can spring for some after market studs. Just do a search here and you'll find a few threads on this. Use their lube on the threads, and torque th their specs. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

04-06-2006, 03:54 AM	#3
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	Why do you advocate using motor oil on the threads? A good moly lube with a high % of moly has a LOT less friction under the very high contact stress of the threads and under-head areas. Less friction means higher preload and less preload scatter. ARP supplies a good moly lube with their bolts for good reason. You have a lot of Supra knowledge, so I'm curious about the oil reco. __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

04-06-2006, 09:19 AM	#4
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	i believe its because different companies moly lube applies different torque to each bolt i don't know the fancy words for it but i think that's it? anyone else? lol __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

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