7MGTE compression

[blackmk3]

hi i just bought a ma70 mk3 checked compression and lowest was 120psi highest 138psi....i retourqued the head to 75ftlbs, that compression is normal isnt it? it seems to be but i thaught id ask sum people that know....

[Malcolm]

Most engines have around 160-180psi, I would definitely be worried if your compression is that low. Being a 7MGTE, I'd say you have a blown headgasket.
Coincidentally I have a complete, brand new genuine Toyota 7MGTE headgasket set here (heaps of gaskets including manifold gaskets, head gasket itself, valve stem seals etc) that I'm selling for $200 if you want it

[Silent Knight]

http://supra.co.nz/87tsrm/index.htm

You should find all of the answers you need in there.

[blackmk3]

hmmm ok cheers 4 that :S it is blowing bubbles thru the radiator but my mecanic friend said because of the thermostat being siesed open the water would airiate around the system and bubble......im ordering a new thermostat tomorrow, is ur gasget a standard replacement? or a metal 1 or sumthing.....

oh and cheers 4 the link

[Lloyd]

it is blowing bubbles thru the radiator but my mecanic friend said because of the thermostat being siesed open the water would airiate around the system and bubble

Might be time for a new mechanic too

[blackmk3]

hey ALL FOURS are u selling any parts from ur GA70? what colour? ther very similar to ma70s arnt they..

[deaf_rattle]

ga70s are the 2l version
ma70 3l
jza70 2.5l

you have a bhg

[blackmk3]

ahh right i c, hmmm dam that sucks about the gasget ive just bought it from a lady that usted to daily drive it to work without maitiance u shd c the radiator! do the internals usually rust out.....?im just thinkn if i wip the top off to find everythink nasty looking inside...

[Lloyd]

You're usually right just to flush the cooling system out completely and just get the head resurfaced with a new gasket. They're well known for doing the headgaskets so it might pay to invest in a TRD one or something?

[blackmk3]

yeah that mite be a idea a...any idea on cost? im guessing uve been thru all this before..

[Lloyd]

Not personally, ust speaking in general. Anyone know of any other way to prevent the headgasket issue?

[Malcolm]

it's a stock Toyota replacement gasket set. If properly torqued down (atleast 70ft-lbs) it should be plenty reliable unless you're looking at running high boost (16psi+). That's assuming the head isn't stuffed. Pays to get the head hardness checked as if it's been overheated the alloy will have softened and it may be too soft

I'm not selling parts from my GA70, I have some 7MGTE engine parts (no block, head, or turbo) for sale, aswell as an R154 gearbox w/ 1JZ bellhousing, and a rolling manual GA70 with no engine or gearbox.

[blackmk3]

yeah the cars dead stock at the moment so i cant run that kinda boost anyway so i wouldnt think id need a flash as gasget! ill get back to you on buying ur gasget kit.... u bought it and had no need for it or sumthing?

i dont think its been overheated its been supeer nannaed (imported 1996 and shes owned it eva since!) but ill sure get it checked out

i am after sum 7mgte coil packs tho...if u wer advertising sum on trademe i think i txt u...

[Malcolm]

I bought the head gasket set when I was going to rebuild my 7MGTE. Then I took the head in to be planed and they tested it for harness and they said it was way too soft to reuse. So I started looking for another head, when a 1JZ came up, and I bought that instead. Then I ended up buying an SC AW11 and deciding I had far too many cars for a uni student so I'm trying to sell the GA70 and all associated bits.
I bought the gasket set from Mr Revhead and it cost $200, it was the last in the country so to get another would cost a lot more than the $200 I'm trying to sell it for.

I saw your thing about the coils, and responded.
Ring or text me on 027 664 7293 if you want to look at or buy.

[deaf_rattle]

it was not the last in the country.

and 75ft-lbs at least is recommended

i torqued mine down to 82ft-lbs with the arps as per arp instructions

[Malcolm]

really? well that's what Warwick told me at the time.

[deaf_rattle]

i got one not so long afterwards
im sure toyota would have a whole warehouse just to stock 7mgte head gaskets.

[blackmk3]

kan the old head studs b reused or is it not worth it?

[Malcolm]

it's not recommended to reuse them. You can get ARP head studs or bolts through 935motorsports.com for less than $100US (last time I checked anyway).
Give me a call on 027 664 7293 if you want the coils and/or the head gasket set

[blackmk3]

whats best studs or bolts? and whats the diffrence?


ill get back to u all fours about the coils and gasgets im just gna geta co2 test done and everythink cheers