Another 1kz-te head

[sourdawg Lurker Find all posts View Profile Close sourdawg]

Hey huts
My 90 series has been struggling a bit with the heat, needle was creeping up a bit, replaced fan, thermostat, flushed cooling system.

Had been behaving but recently after driving for only around 15 minutes, towing a light camper trailer the needle shot right up. Pulled over and the overflow reservoir was completely full and the overflow hose was still pushing air out. Let the pressure die off and put the hot coolant back in the rad, turned around and limped home. Borrowed a friend's car for the camping trip then came home and drove around another couple of weeks with no dramas.

Next time I went out on the open road, this time with no trailer the same thing happened.

Read a lot about there being two different heads so pulled the old one off to see which I had. It has the recesses for the valves so will order the appropriate head. I'd like to get a genuine gasket (mine has 4 holes) however amayama states that part number 11115-67040-05 is discontinued and 11115-67050-05 MAY fit. Should I order this part or use aftermarket?
Cheers

[SamSta Member Find all posts View Profile Close SamSta]

It's possible you just had a leaking gasket allowing combustion gases into the water jacket this pressurizing your cooling system. This happened to me at the end of last year. One of the middle two cylinders was the culprit. According to an engine rebuilder, this commonly occurs when someone replaces the head (at some point), uses sandpaper to clean the block and rubs unevenly in one point using there thumb and sandpaper (not using a flat sanding block of sorts). While you've got the head off, maybe check with the edge of a metal ruler for uneven surfaces on the deck. I sat a torch on the other side of the ruler so I could see any light shining through between the block surface and the ruler if that makes sense?