coolant leak (pics)

[87supraturbo19]

I cannot find exactly were this leak is coming from. Its not coming from water pump or the thermostat. Its coming from right behind the thermostat. Its not the turbo lines either. here are two pics of the lines I took,and the last ones what kept me from working any further.:aigo:

 

[jdub]

That 90 deg rubber hose in the 2nd pic looks buldged...it connects the hard line around the block to the water neck. It might have a pin hole leak on the bottom side. In any case, I would replace it...it doesn't look good and if it goes, you will lose all your coolant in short order.

 

[87supraturbo19]

Ya it is bulged. I am going to replace it. I am pretty sure its not the culprit. Is there another back there to check. never leaked before just one those things that popped up during the summer time heat.

 

[WhtMa71]

If you dont think thats the culprit, go to an autoparts store and rent a coolant system pressure tester. You can pressurize to system to the right pressure(per rad. cap) and check for leaks without the engine running. That would be the easiest thing to do.

 

[jetjock]

Must be a hell of a leak to cause those clouds

I don't see the heat shield for that hose btw. Bad news if it's missing.

 

[jdub]

- The hard line attaches to the water pump housing (gasket)
- The two turbo coolant lines to the water neck and water pump union (copper crush washers).
- Water neck sensors
- Where the water neck bolts to the head (gasket)
- Long shot - there's a freeze plug above the oil pressure sensor (I actually blew this one)

As posted above, a pressure test should reveal the leak.

 

[87supraturbo19]

explains the bulging

 

[87supraturbo19]

I bought the car without the heat sheild pic please?

 

[jetjock]

http://tinyurl.com/3soarg

See the hose, 16283? Look to the right beyond the clamp. It's that flat piece. Part of the water piping. I think I see the remains of it in your first photo. Fab something up to replace it.

 

[87supraturbo19]

I bet its leaking where the water housing connects to the block. Not that i can see up there anyways. It has to be. It a pretty good leak. it leaks without the car running.

 

[87supraturbo19]

hey guys i have isolated were the leak is. I have added the red arrow. Its behind that coolant attachment, but it is not leaking from it.

I have coolant pressure tester. when I pressurize the system and stick my finger back there I can feel it squirting but there is no way to see exactly were its coming from. It doesnt feel like its coming from where the thermostat housing neck connects to the block. Could the back of the water pump be cracked. Is there any thing else back their?

 

[87supraturbo19]

Does anyone know if the water pump housing, not the pully part of it, but the part that bolts too. Is cast into the block or bolts on?

 

[jdub]

It's a cast piece that bolts on to the front of the block...the front plate that has to be machined when you deck the block for a MHG prep. You would have to take everything off the front of the motor and remove the head to get to it.

 

[87supraturbo19]

Wow that freakin sucks.

 

[87supraturbo19]

I am trying to buy another 7m, but its a very slow process. I know the majority will scald me, but what about a temperary sealant until I get it? Opinions?

 

[87CandyBlueT]

I have had this leak before and it was the water neck gasket. I bought a pressure tester to find this leak, it was a lot slower of a leak than yours appears to be though.

 

[87supraturbo19]

I have a pressure tester. I dont THINK it is the water neck, but it is extremely hard to see where is leaking. I took the cps out and every thing else that wasnt a big deal. Spent an hour half looking with a flashlight and an inspection mirror.
Is there way to tighten the water pump housing with out taking the head off?

 

[87supraturbo19]

here is a pic i found. How do you get those studs loose? I guess I am having a brain fart? This gives me a pretty good idea where the leak is.

 

[jdub]

That's not a 7M water pump housing.

This diagram shows the front plate with the water pump housing on the left:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=EM&P=63

 

[87supraturbo19]

So I would like to try and tighten where the timing belt case is leaking (right behind the water pump housing. I would like to avoid taking the waterpump off just to find I didnt need too.

Are the bolts covered by the water pump or do the water pump bolts go all the way threw to the block(threw the housing also)?