7mge BHG

[supra_cam]

My mate and I are going to replace my MA70's blown head gasket and I was wondering if there are any good threads here or any other websites with good information about this? I have tried searching here and was suprised not to find anything on this common bastardly occurance! cheers

[ma61turbo]

What do you need to know? How to do it? The TSRM might be useful to you:

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/

[NoRecall]

What he said ^^
Plus where in tassie are u?
Limmy one of my mates replaced his not to long ago in his MZ20, PM him and he'll have some info for ya.

[supra_cam]

in Richmond mate, that supra site's pretty awesome ma61turbo cheers. Was wondering how tight the head bolts should be?, I heard that toyota didn't set them tight enough in the factory.

[NoRecall]

You have heard correctly!
Im up Devonport. GL, as said befor, PM Limmy and he can tell you what he set his to.

[ma61turbo]

in Richmond mate, that supra site's pretty awesome ma61turbo cheers. Was wondering how tight the head bolts should be?, I heard that toyota didn't set them tight enough in the factory.

I hope you will be using brand new bolts...I'd set them to around 65ft/lb. That should be plenty tight for the 7m-ge.

[Negative Boost]

I think my head bolts on my 7MGTE are set to 69ft/lbs.

[supra_cam]

i've heard of people using ARP head bolts, is it better to buy a good brand like ARP or would any brand do?

[ma61turbo]

They'd be useful on a 7m-gte if you want to torque them up past 75ft/lb but they aren't worth it on the 7m-ge. FWIW I'm running stock Toyota headbolts on my 7m-gte at 72ft/lb with no issues.

[TheStitt]

72ft pound on the factory 7M bolts

[doobs]

My ARP head studs are torqued to 80ft/lbs as stated in the ARP instructions, on my 7M-GTE and I'm running 12psi, all good so far.
I had the head skimmed too, which I highly recommend you have done... Make sure you use lube when you install the new bolts, and follow the correct torque pattern, all SHOULD be fine and dandy...

[limmy]

yeah i wasnt sure if it was 72 or 72 but yeah mine are tourqed to 72ft/lbs just one precuation when i got this soarer even b4 it was really properly on the road was to give them head bolts a nice tightening. bloody 7m powa

[supra_cam]

started work on it today, took the head off, it looks pretty clean and in good condition but going to take it to Gorringes tomorrow and get it checked, they can skim it if it needs to be done. My mate reckons its been skimmed before as the compression is quiet high, 150 for the 1st cylinder, 190 for 2-5 and 175 for number 6. The supra TSRM says it would only be 156! We also noticed many bolts were not very tight.

[Screamn_Sleeka]

Well, it was toyota that left them not very tight so im told, dont know the truth behind it though.
My stock 4M gets 180psi on every cyl, 156 can not be stock 7M-GE, maybe 7M-GTE with the turbo unplugged.

Does anyone know how much the head can be skimmed before the pistons start mashing the valves up? (For supra 9.2:1 pistons)