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The mkiv Supra Owners Club

2JZ GE Overheating


Josh42

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Almost certainly will not be the actual pump. It will be a £1 core plug that sits in the back of the rear housing. Such a common problem and I have never understood why only that core plug fails so often and if you pop any of the others out, they will most likely appear mint. I have a brand new one in my toolbox if you want it.

 

C.W. explained that it corrodes there due to cavitation.

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Yeah, it's toward the centre of the car, in a small cylindrical piece of casting on the back of the pump... Ill get a photo later on if I can mate and that would be awesome!

 

Yep, that would be the core plug. Pretty sure that this is the one you need, I have a few rogue ones in the toolbox left over from various adventures, but sure this is the one. Last time I bought 2, 1 as a spare as it was the second time it had happened, but then I sold the NA.

 

image

 

Yes David is right, here's the thread. http://www.mkivsupra.net/vbb/showthread.php?270206-Core-Plugs&highlight=chris+wilson+core+plug

Edited by Shane (see edit history)
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Do you have to yank the engine to replace the plug?

 

No, Crank pulley off, timing cover and belt off to get to the water pump bolts, water pump and rear housing comes off in one complete with the curved bypass alloy tube affair that sits on an O ring if I recall correctly. Once out, the dead plug can be pulled out with ease, new plug in and then re-assemble. Fiddly, but not a difficult job at all. You may find the hardest bit of the whole job is getting the crank pulley bolt undone. If you PM me your address I will pop this plug in the post to you tomorrow.

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Fit a new o ring on the by pass pipe ;)

 

Have to admit I didn't replace the O ring on mine as I didn't have one to hand the exact size, however I did put the thinnest smear of liquid gasket on one of the faces before re-assembling. As said by PM Josh, take the rad, cowl and fan off first before you tackle the job and if yours is an auto then make sure you plug the transmission coolant hoses as soon as you take them off the cooler on the bottom of the rad.

 

One last thing, try and remember what bolt comes out of what hole, suggest using a bit of masking tape and a pen for this. There are quite a few and several different lengths. Dont do what I did and wind the wrong length bolt that clamps the bypass hose into the head which is a blind hole and snap the bolt off in the head...eeekkk. Simple but very avoidable mistake if you take just a few seconds to mark the bolts up as you take them out.

 

Will post the plug out to you tomorrow and good luck. If you are lucky you may just get away with getting the pump gasket off in one, but if you can try and get one in before you start, if not a tube of liquid gasket will be your friend. You can buy gasket paper on ebay, but its quite a curvy gasket with lots of holes so I would go for a replacement or liquid gasket. Its really not a difficult job, just leave yourself plenty of time and be thorough. If you can afford it, take the opportunity to replace the cam belt and tensioner too while its all in pieces..

 

Good luck and let us know how you get on.

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