Updated the Update Over Heat***. Engine bay heat

[dannyvp]

That doesn't look like a Toyota thermostat to me. If it's not, replace it with the correct Toyota part

it’s an Aisian thermostat.
does it matter if I buy an 180 or 190 deg thermo?

 

[OSS]

Either one wouldn't cause it to overheat. When the coolant entering the thermostat housing is over about 200°, both the 180 and 190° thermostats are fully open. At that point, it doesn't matter what the temperature rating of the thermostat is.

 

[dannyvp]

Well head gasket doesn’t look like it’s in bad shape to me. Appears to be on correctly also.

 

[dannyvp]

spot on cyl 6. Piece missing it appears from gasket.

damaged ring on cyl 5.

head between 5 and 6

6,5, and 4

block at 6 and 5

 

[dannyvp]

Any ideas guys?
Opinions on next steps?

 

[BlackCat]

Any ideas guys?
Opinions on next steps?

Have the head thoroughly checked for cracks.
I think I can clearly see one right off the bat.

 

[dannyvp]

that made me run outside to check. That was just a little of the graphite gasket left over.

 

[g-man]

Just an idea, but since you have coolant getting into your exhaust manifold can you look inside the exhaust passages on the side of the head for cracks? Can they magnaflux those areas or only flat surfaces? I'm wondering if the crack is between the coolant passage and the exhaust. I'd be you have a cracked head but haven't found it.

 

[g-man]

Check to see if one or more of the exhaust ports in the head look to be steam cleaned from the coolant.

 

[dannyvp]

The block is flat, and the manifold is in spec for flatness.
Cylinders also appear to be in good shape.

 

[dannyvp]

Either one wouldn't cause it to overheat. When the coolant entering the thermostat housing is over about 200°, both the 180 and 190° thermostats are fully open. At that point, it doesn't matter what the temperature rating of the thermostat is.

anything else I should check? Items that may have caused this issue?
head is being checked.
OEM head gasket
New head bolts
New OEM thermostat

 

[OSS]

Chase all the head bolt threads in the block with a tap to clean out old carbon. The threads get carbon and rust in them. Either from the assembly oil burning up or moisture somehow getting down in there. Clean threads will ensure the correct clamping force when tightening new bolts. You'll be surprised how easy they turn compared to old dirty ones.

https://www.mscdirect.com/product/details/04996005?rItem=04996005

 

[NeverGiveUpYota]

@dannyvp, you could try asking Greg @gregnash if you can borrow his tap. I had it for awhile but he’s had it back for a bit now. Easy enough to use.

 

[gregnash]

@dannyvp, you could try asking Greg @gregnash if you can borrow his tap. I had it for awhile but he’s had it back for a bit now. Easy enough to use.

Hit me up via PM Danny if you need it. Happy to lend out.

 

[dannyvp]

I think I have that one in my kit, I’ll have to check. When I removed 2 of the back head bolts I noticed they they had gunk on the ends of them.(the very tip) I wondered if that caused me issues, or not. (I’m sure it was just another straw on the pile)

 

[NeverGiveUpYota]

@dannyvp you do need to check for flatness not just straight across. Check the fsm for the pattern.

 

[dannyvp]

I checked with a pattern. No light shown under the straight edge. My manual got its first smudge of grim on it today.

 

[dannyvp]

chasing the threads while I wait on the head.

 

[NeverGiveUpYota]

View attachment 2123502
chasing the threads while I wait on the head.

If you can, check the flatness along those holes... sometimes the bolts will pull the metal up. My shop chamfered the holes. You could do it yourself w/ a chamfering (might not be the correct term) bit. I saw some at Ace and had googled them before I got the block back and noticed they’d done it already.

 

[dannyvp]

If you can, check the flatness along those holes... sometimes the bolts will pull the metal up. My shop chamfered the holes. You could do it yourself w/ a chamfering (might not be the correct term) bit. I saw some at Ace and had googled them before I got the block back and noticed they’d done it already.

Huh, is that common todo? I have some of those bits.