have ? about puting a CAM in my truck

[toyota35bogger]

hey guy i just got a crane cam for my 4runner and i was wondering if i have to change the head gasket when i put the cam in thanks

[reklund5]

Yes.

To remove the camshaft, you have to remove the rocker arm assembly, which is held down by the head bolts.  Loosening the head bolts will un-seat the headgasket, necessitating a new headgasket.

Ryan

[Zoomschwortz]

I read somewhere that if you drain the coolant, before removing the bolts, it will not unseat the head gasket. I HAVE NOT TRIED THIS SO IT COULD BE  :bull crap:

I guess you need to decide if is worth taking a chance. If it works you save yourself some work. If it doesn't work it will add a little more work for you since you will need to take all that stuff off again, but could go bad at the worst possible time.

If you don't change the gasket it might be worth using head studs instead of bolts. They clamp a lot better.

[toyota35bogger]

yea i read the same thing about draining the coolent i don't know might have to do it and see

[Marlin]

I have changed many camshafts and have never had a head gasket failure.

You must drain the coolant before you remove the head bolts.
Because eight of the ten head bolts have engine oil pumped to them thru the rocker arm assemble, the head bolt holes deep in the block must be sucked of oil when the bolts are removed, or the head bolts could hydraulic when torqued resulting in an under torqued head that will blow a gasket.

If you find a rusted head bolt, you will need a 12x1.25 mm tap to clean the block threads.

Re torque the head from the center out in three steps: 30 foot lbs, then 45, and final 57.
57 foot lbs cold, 63 lbs hot.

[84toyota]

the block must be sucked of oil when the bolts are removed, or the head bolts could hydraulic when torqued resulting in an under torqued head that will blow a gasket.

What is the best way to clean out the holes in the block once the bolts have been removed?  Cotton swab?  Air compressor?

Thanks,
Ken