Outer Limits 4x4 Board

hey guys i have a mate with a tb 42 strait gas turbo and blew a head gasket strait away. i have heard about copper head gaskets for these and just wandering where i could get one from in melbourne and roughly how much they are cheers kyal

KYSI wrote:hey guys i have a mate with a tb 42 strait gas turbo and blew a head gasket strait away. i have heard about copper head gaskets for these and just wandering where i could get one from in melbourne and roughly how much they are cheers kyal

How much boost etc.

I blew one on my patrol too when i went from 8psi to 12psi and replced it with a genuine nissan head gasket and replaced the head bolts and havent had a problem since, touch wood...

it was on 12 psi, we think it already mite of had a blown head gasket before the first drive, he is doing all the work himself so if he can get a copper one he will most likely wanna just use it

hey kyal they seem ok. go a cometic head gasket of some sort though acl gaskets make one

with a copper gasket youd really wanna o-ring the block.
a metal headgasket or just a standard replacement would likely hold it if its tuned well.

cheers, andrew

Don't go copper, composite head gaskets will hold 18-20psi if, the head is not soft, the bolts are not stretched, the deck and head faces are dead flat. If any of these things aren't right you will have problems regardless of the gasket types you use. It is common for the heads to go soft with age, when its off get a rockwell hardness test, if its below 85 rockwell throw it away.

Joel

Thanks for your help guys,

Joel where would i be able to get the gasket you are talking about, Also is mine most likely gonna blow a head gasket with the setup u sold me? if so should i just change the head gasket when fitting mine up??

Cometic MLS gaskets are very good and can be bought from a few places, if you dont have a trade account you can google and find heaps online, theres plenty of others too, genuine nissan ones on RB30's for example are known to hold 20 PSI+. I been using a graphite one in mine (japanese made around $90 at trade price) for 18 months 9.2 static comp plus boost up to 14psi and not a prob.

KYSI wrote:Thanks for your help guys,

Joel where would i be able to get the gasket you are talking about, Also is mine most likely gonna blow a head gasket with the setup u sold me? if so should i just change the head gasket when fitting mine up??

We have a number running around on 300k klm stock motors at 10-12 psi, if it ain't broke don't fix it. I would personally retension the head, I have done this on all the ones I have fitted, just retension to standard specification. I usually mark the bolt and the head with a texta to I can see the amount of extra rotation on the bolt and do one bolt at a time starting from the middle in the normal tension pattern.
If you are unlucky and it does then the reality is probably the head is soft and will need a new core.
If I'm building a 20 psi + engine I get the deck and head surface ground on a special machine that gives a dead flat surface unlike decking with a fly cutter that tends to leave a shallow depression in the middle of the head and deck running front to back.

Joel

cheers joel very helpful info there, my patrol will be ready to come to you guys in mid september to have the tune up and oil lines fitted, is this any drama with how busy you are? let me know

cheers Kyal

Just give us a couple of days to a weeks notice and we'll be fine.

Cheers

Joel