2/3/5L oil cooler and oil pressure relief / release valve

[AE85.6]

Just checking if anyone has serviced or replaced these in their hilux / hiace ?

The 5L in my hilux has started to leak a bit of oil,
Has been quite hard to trace but after a lot of degreaser and rechecking I think it is coming from the either the upside bolt at the front end of the alloy oil cooler housing and/or the alloy cooler housing itself.

As far as I know the bolt holds in the oil pressure relief/release valve bits which is a washer, spring and lil piston setup which I have read can gunk up and stick in place causing the leak unless loose or washer fails. Also read if gunked up then clean everything to free it up and refit but good idea to replace spring if not the lot (think these are available new still as a kit ?).

I assume the length of bolt, spring, piston etc is to much to remove in place as its in a pretty awkward spot with not much room under, so guessing remove cooler housing from side of engine to do ? This means turbo and exhaust manifold off first. Also does the cooler itself has a rubber gasket etc or is this silconed on or ?

Any info is helpful.

[Dell'Orto]

If its the same as the 3S coolers and 4A oil filter pedestals, then theres an o-ring in behind it sealing it to the block which leaks, real common on both those motors.

[DFECTED]

they are different.

Best thing to do is remove the side cover from the engine as its common for them to leak and not the pressure relief bolt. Make sue you clean the gasket off thoroughly as they are really hard to get all the gasket off. Light coat of silicon both sides of the new gasket. The spring wont need replacing but make sure the pistons are free, some side covers have 2 relief valves

[AE85.6]

Asked Mark about few parts prices and being the champ he is had a link to a diagram: http://www.toyodiy.com/parts/p_G_1999_T ... _1502.html

Was not sure if the upside down bolt on its own at the opposite end from filter should have valve and spring also ? think this one is leaking on mine however if it does not have a valve why is it there or what does it do ?

DEFECTED:
Hard to get gasket off hmmm im assuming oil paper type then ?
I think mine has the two releif valves however hidden under filter, I was looking at the one only bolt at the wrong end I think.

[Mr Revhead]

If it's that plug I'd take it off and replace the washer. Try a copper one. GIve that a go before doing anything more as it will be a cheap easy fix.
It's not meant to have a spring etc. It's will be blanking off something thats possibly used on another model

[AE85.6]

I though that could be the case Mr Revhead as I could not really see much point, not much room under it so I thought it would maybe need an elbo fitting to have be a line to or from a proper lil radiator style cooler or something but obviously the other side should have the other line, then it maybe opened by temp or pressure before circling that cooler ?

If this or similar was never an option and only flows oil to the filter on the other end I don't really see the purpose for it, the valve would not change the flow to filter and the alloy casing does not have much path for the oil to travel through or like I had imagined it would so wouldn't think it would cool it much either ?

[AE85.6]

update time...

Bit of a mission so far but took out the piston and spring from the cooler plate which you can just get to if you take the oil filter off, was all free moving and clean etc but when replacing the bolt with new washer and barely nipping the bolt up the neck it threads into snapped off... F#$K, appears to have had a crack on the engine side which I could not see but would rather this happened in the drive way and not driving etc.

Cant not really shorten or weld back on as needs to be exact for piston inside I guess so I managed to get a new one from Mark at Toyota (legend man !). Have now removed exhaust, turbo, manifold etc to get to it, then removed the oil cooler part from the back of old cover and swapped onto new cover plate.

I did not realize this part was a heat exchanger type cooler and that it had coolant around it !? Hope it seals correctly as I don't want ay oil in water or vise versa.

Spent ages cleaning all the old gasket off which was a paper one and the new ones supplied with cover were steel ones so just ran a bead of master gasket around either side before installing. Also looked like old one was leaking along the bottom of cover plate too so I guess had to come off anyway.



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May look to getting the turbo reco'd before throwing back on but am hoping this sorts the prob.