Hello, my 1jz was mixing oil and coolant, so i figured it was the head gasket or the head cracked. I took the head off, the head and the gasket were fine. I sent the head out to be machined and put it back together with a new gasket. The oil and coolant are still mixing. Ive checked the oil cooler that is also working. Im kinda stumped. Can they mix in the turbos?
Oil and coolant mixing on 1jz
- Thread starter kuwugata
- Start date
I've wondered this about another engine. Does the block have cooiling ports in them? If so, if one was cracked, would the coolant get mixed in with the oil? I had a friend of mine whose car was in a head on collision. We put the motor in another car and the water and oil were mixing. It was a 2jz. I'm just wondering if something in the block was cracked letting the two mix. I checked the oil cooler lines and they aren't mixed with any other lines. I'm sure you've done the same. Hopefully someone will have a suggestion for you.
yea the block and head have water jackets, which when cracked mix. This motor was also in an accident. So coincidence? or just what happens to wrecked motors? lol fml
Do you guys see coolant in the oil pan , or oil in the rad? Or both?
I would pull the motor, pull the pan, and pressure test the cooling system. That way at-least you'll be able to get an idea of where its coming from (ie front of motor, rear, turbo drain, etc). I have never tried it, but it sounds like a good idea in my head.
I would pull the motor, pull the pan, and pressure test the cooling system. That way at-least you'll be able to get an idea of where its coming from (ie front of motor, rear, turbo drain, etc). I have never tried it, but it sounds like a good idea in my head.
The chances of this mixing in the turbos is essentially zero. In order for the two to mix inside the turbo, the turbo would be SO dead already, you'd know. They aren't separated by a seal or anything simple, it's an entirely different chamber in the CHRA.
Typically it's difficult to crack the block from the oil supply to the water jacket without having a far worse problem with the water jacket to cylinder.
Typically it's difficult to crack the block from the oil supply to the water jacket without having a far worse problem with the water jacket to cylinder.
Some oil in radiator. Some coolant in pan. I pressure and compression checked it before i changed the gasket everything was fine. That led me to believe it was mixing in the jackets(cracked block,head,head gasket) i ruled out the oil cooler mixing the fluids by running some water through it and it seemed good but now im thinking maybe not. I'm gonna bypass the oil cooler and see if that works.
---------- Post added at 08:36 PM ---------- Previous post was at 08:28 PM ----------
Yea, I figured it would have to be something catastrophic for them to get oil and coolant to mix. They spool fine and dont make abnormal sounds.
---------- Post added at 08:36 PM ---------- Previous post was at 08:28 PM ----------
GrimJack;1625525 said:
Yea, I figured it would have to be something catastrophic for them to get oil and coolant to mix. They spool fine and dont make abnormal sounds.
mkiiichip;1625533 said:
No, just that it's the *most* likely. It's possible to crack the block between the oil high pressure gallery and water jackets. However, I've never seen it - and I *have* seen many, many, popped head gaskets. I've also seen quite a few cracked blocks, but never one that didn't cause a massive failure in the cylinder to water jacket at the same time.
When my 2JZ failed-swap had a similar issue, I asked the same thing... that cooler can oxidize or open up in a way that lets them mix. I cracked the block/water jacket on my 2J and had to rebuild (using an N/A block now). Dunno what the options are for an aftermarket cooler, but good catch. Rebuilding after spinning bearings wet with coolant ain't no joke.
started the car for the first time yesterday and when i lifted my oil cap i found the milky oil on the under side. not sure if it is the same problem you had but it make me wonder. i guess the engine has been sitting for alot of years in japan and i just need to get the condensation out.
how did you find out it was mixxing, did you change the oil and then seen it or were you getting the millky crap to?
how did you find out it was mixxing, did you change the oil and then seen it or were you getting the millky crap to?
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I did a few oil changes and it was staying milky as hell. after i fixed the mixing it actually took me two oil changes to get most of the water out even after fixing the problem. So go buy some cheap ass oil. lol