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The mkiv Supra Owners Club

Over Heat -> No start -> No Compression -> Help


Spyda

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Hey,

 

I'm in the lucky forest at the moment!

On the way up the M20 on Friday evening, do about 70 ish not pushing the car very hard. Suddenly the temp gauge shoots up as far as it'll go, followed by steam pouring up over the bonnet. I promptly pulled over onto the hard shoulder. Where the car immediately stalled once stationary.

 

I called the breakdown peeps, (which I'd luckly signed up for a few days before!) they didn't even open the bonnet, just put me on the flat bed and dropped me at my destination.

 

Anyway my plan for Saturday morning was to put some water in, start her up and see if/where it was leaking from.

Well that was wishfull thinking as it wont start. It turns over, but just wont fire up.

The next guess was that there's something up with the head gasket. I did a compression test which gave me the following results.

 

Cyl #1: 70psi

Cyl #2: 10psi

Cyl #3: 50psi

Cyl #4: 50psi

Cyl #5: 40psi

Cyl #6: 45psi

 

Would you consider this to be conclusive proof that the head gasket is knackered?

If so what's do I plan to do next?

 

It would have to happen when I wsa thinking of selling it anyway, just what I need! More expence when buying a house!

 

Any help/advice would be appreciated,

 

Cheers,

 

Adam.

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You need to get the head off and see what the damage is. It's not a pleasant job though, especially if you still have the stock twin turbos.

 

Was the bottom end sounding OK before it stalled? Over-heating that badly my have ruined the bottom end too :(

 

Good luck

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Classic case of a real serious overheating, I'd bet the piston rings have lost their tension. I had this on a Skyline engine, 18 months ago, the lad overheated it, but carried on driving until there was smoke entering the car via the heater. Stopped, let it cool, added coolant and it would then only start with a tow. Low compressions on all cylinders, and a strip down showed glazed bores and that all the piston rings had relaxed. Needed a rebore and new pistons and rings to sort properly. Runs fine now, it didn't blow the head gasket, nor did it warp the head, to my amazement.

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