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Test For Coolant System Additives To Stop Leaks

Nismo 3.2ish

By Nismo 3.2ish,
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Nismo 3.2ish Grand Master

Nismo 3.2ish

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So you bought everything except the coolant hoses and manifold. Is that right? And the turbo was selected for your 26 and I assume it has a .84 rear, is that correct?

Yes , paid for the Nitto Stroker, Coppermix clutch, Quaife front diff and most of the other before the build was started and added a couple of things like flex fuel sensor, but had all of the quotes before the build started.

The turbo had the .84 added at build time

I listened to like minded blokes on the SAU, asked questions, went surfing the web and got what I thought would do what I wanted.

I was going to leave the Turbo on until after the build to see how it went. It goes OK, so it stays.

After the build , the manifold was changed because it was full of cracks and holes. Had the fuel line updated and a flex tune, the results were good.

Just back to the water problem and now we will see how it goes, I think it is going through the motor some how and it will have to be pulled down before it has major damage done.

Should know tomorrow :/

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GTofuS-T
GTofuS-T

I'll be back in 100 pages...

Duncan
Duncan

well.... any of those things leave an obvious white residue when dry in either the top of the radiator or overflow bottle. I don't know of a test for the coolant either. But more importantly, you ca

tridentt150v
tridentt150v

Not yet, still waiting on a price for the Skyline.....thanks for asking though..............lmao!!! And yeah interested to know as well.

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Nismo 3.2ish Grand Master

Nismo 3.2ish

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Simple solution here...........sell it to me!!! Of cause I will be broken hearted about the leak but I've live through it :rofl2:

Seriously, stick at it, its only one small nagging problem.........12 months from now you won't even remember it [well maybe a little bit].

You bad :rolleyes:

I never give up, sometimes that can be very expensive, but life is too short not to get somethings done that you want,lol

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Check the head studs and try re-torquing them, I suspect one or two may have stretched as they did in the car I have here. It won't fix the problem though, if it's leaking the gasket will need to be changed anyway.

Why can't I find L19's or 625+ head bolts for the RB's? I can get both for the VQ and I suspect they are very similar anyway... Same thread M11.

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GTRNUR Grand Master

GTRNUR

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Posted

This can only be 2 things.

1. Crack in block (very unlikely though).

2. Head gasket seal issue, allowing water to leak into oil when water temp is nominal.

I recall reading your normal engine temp was 70-72 degrees. This tells me a few things. You have a Nismo thermostat, and your lower than normal engine temps are keeping your cooling system pressures down, which makes the leak less apparent.

When in fact at all times, the head gasket was leaking between layers between water and oil. When oil was up to temp, it would slowly evaporate the water away which would end up in your catch can and then vented to atmosphere as steam, or consumed by your engine via a breather system.

The head gasket leak issue was caused by the embossing in the gasket not properly compressing around the water galleries to seal. This could have been a machining issue from when the block and head were surfaced, or also could be an issue to do with material deformation caused by those heavy head studs. If properly installed, the head stud thread inserts should be recessed about 5mm from the top of the block, such that when torqued up the deck of the block does not deform. I have seen these installed level with the top of the block, by some machinists.

Only investigation will tell this tale.

My recommendation is to replace the head gasket with a stock one, o-ring the block and have a matching receiver cut into the head. Use a smear of threebond ultra viscous silicon around the water and oil galleries on the gasket, or hylomar spray it both sides. A stock gasket will accept more material deformation than a metal shim one.

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Nismo 3.2ish Grand Master

Nismo 3.2ish

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Very disappointing.

I wonder what crd is thinking now.

They think it is a seperate problem to the one that has been there since the build.

I drive the car and think it is exactly the same as it has been for months, but???

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Nismo 3.2ish Grand Master

Nismo 3.2ish

Posted
  • Author
Posted

This can only be 2 things.

1. Crack in block (very unlikely though).

2. Head gasket seal issue, allowing water to leak into oil when water temp is nominal.

I recall reading your normal engine temp was 70-72 degrees. This tells me a few things. You have a Nismo thermostat, and your lower than normal engine temps are keeping your cooling system pressures down, which makes the leak less apparent.

When in fact at all times, the head gasket was leaking between layers between water and oil. When oil was up to temp, it would slowly evaporate the water away which would end up in your catch can and then vented to atmosphere as steam, or consumed by your engine via a breather system.

The head gasket leak issue was caused by the embossing in the gasket not properly compressing around the water galleries to seal. This could have been a machining issue from when the block and head were surfaced, or also could be an issue to do with material deformation caused by those heavy head studs. If properly installed, the head stud thread inserts should be recessed about 5mm from the top of the block, such that when torqued up the deck of the block does not deform. I have seen these installed level with the top of the block, by some machinists.

Only investigation will tell this tale.

My recommendation is to replace the head gasket with a stock one, o-ring the block and have a matching receiver cut into the head. Use a smear of threebond ultra viscous silicon around the water and oil galleries on the gasket, or hylomar spray it both sides. A stock gasket will accept more material deformation than a metal shim one.

Thanks for the info, it all helps

If I could pick, i'll take the #2 please, lol

Now it is a waiting game , AGAIN :angry:

Nismo 3.2ish Grand Master

Nismo 3.2ish

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I am the same, so Fn pathetic . Got a 14 year old still at home and the car, how sad, haha

I have no info to offer and I need to know what has happened before I shoot my mouth off, guessing is not fair on anyone.

All I know is, it is back to exactly how it was after the build, the difference is now I know where the water is going and the car has not moved since. Just sitting there like a bird with a broken wing, boohoo, poor me

Cars booked in for the 12th of October, once it is in , might have a few things tweaked, cams and CR to see what happens ?

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