head bolts
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YotaZach85
New member
A little oil never hurts when you're tourquing something that tight.
PitbullRescuer
New member
Never had the head bolts off one of these but plenty of other motors. Keep them slippery to get them in there cleanly.
Rockdawg84
New member
they say that the head bolts are reusable but for about 30 bucks from LC Eng. a new set of OEM head bolts seems like cheap insurance to me.
kball
New member
I was going to say you should look it up in the FSM because there is a difference between wet and dry torque. Friction uses a lot of the torque up so the engineers design and specify torque amounts depending on the situation. But I was bored so I did it for you... Get'em wet!
http://www.ncttora.com/fsm/1996/SIL...2rmsour/2002/024runne/em5vzfe/cylhea/inst.pdf
(a)Apply a light coat of engine oil on the threads and under
the heads of the cylinder head bolts.
http://www.ncttora.com/fsm/1996/SIL...2rmsour/2002/024runne/em5vzfe/cylhea/inst.pdf
(a)Apply a light coat of engine oil on the threads and under
the heads of the cylinder head bolts.
Last edited:
Nelsonmd
New member
x2.
Also be sure to review the torquing procedure and make sure that you are torquing correctly. It is a long process, but very necessary. Oil shouldn't be unnecessary. If the bolts don't go in smooth, then you need to clean out the threads.
Singtoe
New member
:iagree:
No sense in spending a couple hundred dollars on a head job to skimp out on the bolts.
Socco
New member
I always do it dry.:boink:. Remember that if you oil a fastener that you need to REDUCE your torque by 15%-30%. So, if your tightening a 3/4" Gr. 8 bolt to 380 ft. lbs. (Dry) you will have achieved that value at only 280 ft. lbs.
Baja Runner
Member
Get new bolts. They sell the Altrom bolts (OEM) at NAPA as well if you are interested.
brian2sun
Elite Member
You should never re-use any TTY (torque to yield) bolts (which is what the head bolts are on a 3.4). Once they are tightened down the 1st time, they will not go back to their original dimensions. They are weakened by the time you take them out and putting them back in is asking for HG issues later on.
cfranck1
New member
:iagree:
Never reuse a torque-to-yield bolt. Because the bolts are designed to stretch once, stretching them a second time may stretch them beyond their yield point causing the bolt to break. They are one-time use bolts, so throw the old bolts away and buy new ones.
TTY bolts are usually installed dry. Do not apply any oil, grease, assembly lube or sealer on the bolt threads. The reason why is because lubricants reduce friction when a bolt is tightened. This actually increases the torque load on the bolt, which may overload and stretch a TTY bolt too far, causing it to break.
Never reuse a torque-to-yield bolt. Because the bolts are designed to stretch once, stretching them a second time may stretch them beyond their yield point causing the bolt to break. They are one-time use bolts, so throw the old bolts away and buy new ones.
TTY bolts are usually installed dry. Do not apply any oil, grease, assembly lube or sealer on the bolt threads. The reason why is because lubricants reduce friction when a bolt is tightened. This actually increases the torque load on the bolt, which may overload and stretch a TTY bolt too far, causing it to break.
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Singtoe
New member
FSM says to apply a light coat of oil on the threads and washer surfaces.
Thanks for all the replies. Sorry I havent responded I've been busy in the garage. I did buy new bolts from Toyota. But I have to tear it apart AGAIN. Check it out
http://www.toyota-4runner.org/3rd-gen-t4rs/92025-reuse-gaskets.html#post806356
http://www.toyota-4runner.org/3rd-gen-t4rs/92025-reuse-gaskets.html#post806356
