Oil Cooler

[YLD-CHLD]

Just wondering if anyone has experienced an oil cooler getting an internal leak & letting oil into the coolant circuit?

I suspect thats were mine has gone.

Forgot to mention that it had a rebuild 15,000k's ago & had a Tomei head gasket installed,compression check came up good & all the studs are still at the torque setting they were initially set at.

And that there is no trace of water in the oil i dumped from the sump.

Only found approx 2-3 teaspoons in the top of the overflow bottle & under radiator cap.

Car was running faultlessly it was just that each & every time i take it out i check the oil,water ,brake & clutch fluid ,& this time found a nasty.

will have the cooler plate made up tomorrow & pressure test it again then & post the results here.

Well low & behold the oil cooler has a crack or pin hole inside & when under 50psi of pressure & at temp of approx 85c the cooler would produce a minute bubble every 15-30 seconds,but would not do this when at room temperature.

Edited September 21, 2006 by YLD-CHLD

[T04GTR]

nup. thats an odd one. the cooler itself is stainless steel so it wouldnt be corosion

id be looking at a posible head gasket problem

[YLD-CHLD]

And Nissan Australia are asking $480 for a new cooler.

Might just go aftermarket.

Does anyone no

1.Approx wat pressure drop in oil pressure do you get when adding an external cooler e.g ARC Oil Cooler?

2.Does the cooler-adapter plate bolt up in place of the stock cooler or does it use a sandwich plate arrangement?

[T04GTR]

did you read what i wrote?

[Duncan]

2. no it is totally different bolt up. You need to stock cooler or a custom fitting.

[Abo Bob]

I didn't realise you were talking about the stock oil cooler down where the oil filter connects.

I bet you there are bunches of them in peoples garages from dead engines etc. What about people who went RB30 bottom end and have their RB25 bottom end sitting around gathering dust?

[Beer Baron]

plus you want the stock oil cooler as it helps get some temp into things quickly by exchanging heat between the oil and coolant.

i have experienced bugger all pressure drop with my greddy oil cooler.

[YLD-CHLD]

Thanks ,yeh it sure was that oil-cooler letting the oil into the radiator.

Know to get a new cooler & an aftermarket one for those track days,if i ever get to go!

Anyone got contacts in japan to get the oil cooler direct from Nissan over there?

Can't believe my luck with this ,but keep thinking how lucky i was not to loose the engine altogether.

Edited September 22, 2006 by YLD-CHLD

[Abo Bob]

Put a wanted thread in that section and maybe even in NSW headed something like

Have you got a dead RB lying around?

I need the stock oil cooler from the block.

[Duncan]

no! don't do it!

those coolers are impossible to clean out properly, if you have one from a motor with a spun bearing or other crap in the oil toss it out....other wise you are just putting bits into your nice new motor.

They are about 400 brand new from nissan

[shanef]

but it would be possible to flush them though wouldnt it?

[YLD-CHLD]

nah as stated u run the risk of contaminating the new engine for $475 for a new one i dont think it's worth risking it.

Have tried cleaning oil coolers before & u never seem to be able to stop getting little bits of shit coming out of them.

[Adriano]

For $475, i would be getting a nice new remote oil cooler with oil filter relocator from one of the traders

[Duncan]

You need the standard oil cooler on the block to bolt the filter/relocator too Or machine up some sort of adapter

[shanef]

and there is a difference in the mounts between the RB30 & RB26. Left one is RB30, right is the RB26

[Duncan]

25 is also different to 26, and it looks like it might be different to 30 as well.....thanks Mr Nissan