tuktukmike, on 2005-01-15 01:05:41, said:
The car does have the 7m engine and you seem to know your stuff about this car, the head gasket has long been a problem with these cars due to the air con rad being right in front of the water rad.
This causes the Supras to overheat, i have solved this by fitting an electric fan in front coupled to a relay to the air con switch, works a treat.
<{POST_SNAPBACK}>
Hi Mike,
The reason for the long standing head gasket problem on the 7M engine is not due to the location of the air/water rads. It is due to Toyota not fastening the heads down tight enough onto the block in the factory !
Toyota used a torque setting of 78 N-m on the head bolts. This is insufficient for the pressures created by this engine, especially the 7M-GTE (turbocharged, which I would guess your car is), although Toyota have never admitted this problem. All the BHG problems can be avoided by a re-torque on the head bolts to 97 N-m (78 ft-lb). Also the OEM head bolts are of questionable quality, replacing them with high quality aftermarket ones, such as ARP is money well spent, as is using an all-metal gasket such as HKS.
I was going to suggest you should use some kind of additional electric fan for cooling, but you've done that already. I would also consider bypassing the heater matrix and fitting a larger radiator. Your biggest problem with running this car here is going to be cooling, especially when the car is stationary. Also you will have the air-con is running full belt most of the time, creating more heat and putting more strain on the engine. For the first weeks keep a close eye on the temperature gauge and more so the coolant levels, this will give you some idea of how your car is handling the heat, and what steps (if any) you need to take.
I cannot emphasise enough the importance of checking the head bolts, and re-checking them every year.
Cheers,
INTJ
This post has been edited by INTJ: 2005-01-15 08:50

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