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Old 03-12-2010, 04:10 PM   #1
fasteddy5000
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Default Head gasket replacement

I am a novice mechanic. Im thinking of changing my thermostat my self on my 1990 mk3. Is it possible to do it without taking apart all the cam assemblies and leaving everything intact and just change the head gasket. Does anyone have a step by step diagram on how to do it. Thanks, Ed
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Old 03-12-2010, 07:46 PM   #2
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Waite. you want to change your thermostat.. 1990, eh are they in a different spot?
am I missing something? has me really confused. what does a thermostat have to do with headgasket or cams.? im sure hes talking about something different.

try this on for size see if it helps.
http://www.cygnusx1.net/Supra/Librar...Section=CO&P=8

and this link has some pictures and descriptions of what is on the thermostat housing
http://www.supramania.com/forums/showthread.php?t=70459

be sure to drain the coolant first. at least almost empty if you don't mind having some antifreeze spill out the ground.
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Old 03-13-2010, 07:28 PM   #3
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did this help at all ? or whats up eddy
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Old 03-13-2010, 11:31 PM   #4
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Well this has me beat, changing the stat on a 7m couldnt be easier. If you dont mind losing the coolant and topping up with new you can just undo the 2 bolts and pull the housing back then do the swap. Theres no gasket just a rubber seal.

Tbh i think its a typo and youre asking if cams etc need to come out for a hg change. They dont have to, but it's advisable to remove everything from the head in case any machine work needs doing and also to lap in and gap the valves since you may as well do this while its apart rather than finding issues here after fitting the new hg.
To be honest theres little point trying to take shortcuts with this engine and rushing an hg can come back to bite your wallet HARD!
The tsrm is great for stripdown/test/repair procedures and always the first place i look now, just bear in mind its torque figures for the head are WRONG! Its 78 not 58 and to be honest tighter seems to be better (i went to 93)...
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Old 11-09-2010, 10:58 PM   #5
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i am trying to replace the head gasket on my 89 7mge does anyone have a step by step on how to do it?
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Old 11-10-2010, 12:43 AM   #6
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You can read this...

http://www.supras.com/06/techcenter/display.php?QID=8

and I wouldnt do it if I was a "novice" unless you have the tools and time. Even then I wouldn't do it because its something you dont want to get wrong.
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Old 11-10-2010, 06:58 PM   #7
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Haha this is how I buy most of my supras, a novice mechanic tries to do his own head gasket and I buy it for $500 in good shape just have to put the engine back together.
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Old 11-10-2010, 09:10 PM   #8
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my last supra with a bhg was free

but af for changing the themostat, be very carefull waking those 2 10mm bolts out, if they look rusted use penatrating oil and remove slowly, if they break, its a headache
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Old 11-11-2010, 05:02 AM   #9
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Thats how I got my 90.. lol
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Old 11-24-2010, 08:14 PM   #10
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whats the best head gasket out there for 7m i got 87 supra with a 91 jdm 7mge swap old engine was from a junk with unknown miles anyway before replacing engines i did the following

new
water pump
timing belt and tensioner
full gasket kit
hks 1.2 bead hg
thermostat
all the hoses coolant and vacuum
plugs
wires
cap and rotors
arp head studs
you know the basics of buying a used car
any ways 700 miles later she overheated heated and heard a knock i the lower half of the engine so i started to take it apart again took the head off to see the valve to see if i bent one and went to take the hg off and it fell apart in 3 pieces so now im going to do a full rebuild pistons valves bearings and a port and polish the block and head only have about 30k on if that

so basically whats the best head gasket out there need something thats going to take a hell of a beating

thanks guys


next summer 1uz tt build
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