A few weeks back we found coolant in the oil. Suspected bad head gasket. Pulled apart. Took the head to the shop for usual checks and work. Everything tested good. Installed a OEM Toyota head gasket kit. Didn’t see any signs of head gasket failure. So, replaced all seals and gaskets for oil cooler as well. Put it all back together, compression is good. Runs good. Took it for a 10 minute drive and found more coolant in the oil.
It’s a 1FZ-FE.
Is the oil cooler bad? Just some residual coolant in the system?
Did you (or the machine shop) check the head and block (deck) for flatness, cracks in the head??
Did you get any photos of the head or block (deck)?
How were the head bolts torqued down (new/reused?)?
Maybe drain the oil and change the filter (again) then recheck??
Oil cooler failure, you would have oil in the coolant, as oil pressure is much higher than cooling system pressure. If you pressure test cooling system, are you losing pressure? At any time was the cooling system Rusty? Did you also remove the timing cover? I have seen heavily pitted timing covers.
Did you (or the machine shop) check the head and block (deck) for flatness, cracks in the head??
Did you get any photos of the head or block (deck)?
How were the head bolts torqued down (new/reused?)?
Maybe drain the oil and change the filter (again) then recheck??
I had the head checked at the machine shop. All checks were good.
I did not get any pics. But the pistons and cylinders looked good.
Used new ARP studs and torqued to their spec. 80ft-lbs.
A few weeks back we found coolant in the oil. Suspected bad head gasket. Pulled apart. Took the head to the shop for usual checks and work. Everything tested good. Installed a OEM Toyota head gasket kit. Didn’t see any signs of head gasket failure. So, replaced all seals and gaskets for oil cooler as well. Put it all back together, compression is good. Runs good. Took it for a 10 minute drive and found more coolant in the oil.
It’s a 1FZ-FE.
Is the oil cooler bad? Just some residual coolant in the system?
Ok, so you ripped it apart before properly diagnosing it?
No compression tests
No leak down tests
No cooling system pressure tests?
Now you're questioning what failed.
Did you flush the cooling system?
Did you do an oil change after running for a few minutes?
Is this all residual oil and coolant that didn't get flushed?
Don't run it with any coolant in the oil or you'll be rebuilding the bottom end next.
Ok, so you ripped it apart before properly diagnosing it?
No compression tests
No leak down tests
No cooling system pressure tests?
Now you're questioning what failed.
Did you flush the cooling system?
Did you do an oil change after running for a few minutes?
Is this all residual oil and coolant that didn't get flushed?
Don't run it with any coolant in the oil or you'll be rebuilding the bottom end next.
What can I say, I like taking things apart. That was probably the easiest head gasket I have done.
I didn't pressure test the cooling system. We know it was leaking into the oil.
Cooling system flush was done.
Has had two oil changes shortly after getting it back together.
Still leaking coolant into the oil somewhere.
What can I say, I like taking things apart. That was probably the easiest head gasket I have done.
I didn't pressure test the cooling system. We know it was leaking into the oil.
Cooling system flush was done.
Has had two oil changes shortly after getting it back together.
Still leaking coolant into the oil somewhere.
Oil cooler failure, you would have oil in the coolant, as oil pressure is much higher than cooling system pressure. If you pressure test cooling system, are you losing pressure? At any time was the cooling system Rusty? Did you also remove the timing cover? I have seen heavily pitted timing covers.
My case was the opposite.
I had traces of coolant in the oil. Not visible but Blackstone detected.
Nothing in the coolant.
After much analysis/troubleshooting, I replaced the entire oil cooler and problem disappeared.
This was after a complete teardown and rebuild. Frustrating because I thought I might have done something incorrectly.
Oil cooler replacement isn't too terribly expensive and not difficult to replace.
Happy trails
My case was the opposite.
I had traces of coolant in the oil. Not visible but Blackstone detected.
Nothing in the coolant.
After much analysis/troubleshooting, I replaced the entire oil cooler and problem disappeared.
This was after a complete teardown and rebuild. Frustrating because I thought I might have done something incorrectly.
Oil cooler replacement isn't too terribly expensive and not difficult to replace.
Happy trails
