Headbolts Torque 6A13TT

[LS-Custom]

hi there
i need help with the head gasket,
is there somebody who can tell me the torque for the headbolts for
the engine 6A13TT
or give me a information about were i can get a manual for legnum VR4

greets lukas From Austria

[orionn2o]

Well the JPNZ manual says 20Nm 120 degrees +120 degrees.

Not that I really understand what that means?

Welcome to ClubVR4

[steelie600]

in english that means

tighten to 20 newton metres

then turn through 120 degrees

and then another 120 degrees.

does it mention anywhere about a rest period between actions??

if not i would allow 3-5 minutes between each action for the gasket to settle

oh and to add if the head tighteneing sequence involves angles this is usually an indication that the bolts are stretch bolts and MUST be replaced.

[elnevio]

Yes, I'd tighten them all to 20Nm (in the correct order), rest a few mins, then tighten them all by 120 degrees, another rest, then tighten them all the final 120 degrees. Been a while since I've done a head gasket on anything though - but I assume you can apply the same 'order' to it: start at the centre bolt, working steadily outwards on each side alternately? Or is there a special sequence with these?

[Goku]

^^ You have it right, work from the centre out, though watching the mechanics at my old man's work do the head bolts on a few of these engines, I haven't seen any of them stop for a few minutes inbetween the 120 degree turns. I would imagine it would be better to do so though.

[elnevio]

I'd rest because I'm unfit!

Glad I remembered something right - that head gasket was 15 years ago!

[orionn2o]

in english that means

tighten to 20 newton metres

then turn through 120 degrees

and then another 120 degrees.

does it mention anywhere about a rest period between actions??

if not i would allow 3-5 minutes between each action for the gasket to settle

oh and to add if the head tighteneing sequence involves angles this is usually an indication that the bolts are stretch bolts and MUST be replaced.

Ahh got ya. I hadn't really thought about stretch bolts. I was thinking why not just tighten to 20Nm + 240 degrees!

[Sagnhev]

Why new bolts? Is it gonna make that much difference? Gotta do gaskets this weekend already waited 3 weeks for gaskets from Japan, don't wanna wait another 3 weeks! Tell me it won't matter!

[scott.mohekey]

Will it matter if one lets go and you get a blown head gasket?

[elnevio]

They've already been stretched during the installation. They are not designed to be tightened to 20Nm with two lots of further tightening again.

[elnevio]

They've already been stretched during the installation. They are not designed to be tightened to 20Nm with two lots of further tightening again.

Having said that, I see they CAN be reused if within spec. Given the costs involved, I would prefer the peace of mind of using new bolts. Plus you don't know if your existing bolts are within spec until they're out, and then you're in the middle of the job!