Hi Guys, I am doin a head gasket on my sons FZJ80, what is correct torque, my book says 3 steps, 29 ft lbs 1st, then qtr turn, then another qtr turn??????
Head gasket Torque (1 Viewer)
- Thread starter cvdesertrat
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Yep, that is the process. No torque value per se other than step 1. I remember reading why it is done this way but have long since forgotton.
the quarter turns are because the bolts are torque to yield, the turns stretch the bolt to increase the clamping force of the fastener. if possible you should measure the head bolts to see if they are stretched beyond their service limit
^^^x2
Mark bolt heads with a white welders pen so you know how many quarter turns you have done and on which bolt. When I did mine, I marked all bolts with a dot facing the radiator. I knew I was done when the dots faced the firewall. Follow FSM to a tee. Works like a charm. Clean your block threads, make sure you have fluid or debris in the bolt holes. Oil the bolts so you get consistent torque. Use one smooth motion to hit torque value. HTH.
Mark bolt heads with a white welders pen so you know how many quarter turns you have done and on which bolt. When I did mine, I marked all bolts with a dot facing the radiator. I knew I was done when the dots faced the firewall. Follow FSM to a tee. Works like a charm. Clean your block threads, make sure you have fluid or debris in the bolt holes. Oil the bolts so you get consistent torque. Use one smooth motion to hit torque value. HTH.
Meant to say removed debris and fluid from bolt holes.
A light coating if motor oil on th bolts is recommended and so is following the Toyota factory service manual where all pertinent information on head gasket replacement can be found.
Hit the nail on the head there. The FSM won't steer you wrong just follow it to the T and call it good.
Just an FYI- there is an edit button on your own posts so you can fix them, might prevent confusion in the future. Not a big deal, just me being overly helpful.
- Thread starter
- #9
thanks guys, I don't have the FSM for a 80 series, only my 60 series, using a Haynes shop manual, bought new head bolts from Toyota, turned one of the old ones into a thread chaser to clean threads, blew out the holes after chaseing, and put a light coat of oil on threads
ppc
M Go Blue
Download yourself a copy of the FSM and make your life easier.
For Sale - 40, 50, 60, and 80 series FSM for a hell of a price.
I did this a few days ago and had one bolt go bad when torquing down. If you are reusing the head bolts pay attention to how the bolts feel as they go in, if one fails it will be way easier to turn than any of the good bolts are and if you turn it far enough it will stretch out to the point of deformity or I assume break off in place.
Malleus
Far west of Siegen
Reusing torque to turn bolts is its own reward.
