A few days ago I had to replace the front crankshaft seal on my 89 pickup 22r engine with carb, because it was slinging oil. I took the radiator out and the fan off to get to the pulley. I remved the pulley, replaced the seal put it all back together. Drove it around the block and it wasent slinging oil. I filled the radiator back up with coolant. Drove it again and the idle was really high, after driving about a mile it started to overheat get in the red, I managed to get it back home, got a thermostat put it in and it is still over heating takes about 5-10 minutes to get in the red. It has never overheated before the replacement of the seal. Im thinking maybe I blew the head gasket but nothing sounds different and the oil looks and feels fine. Maybe its the high idle thats causing it to overheat. I tryed to time it with the distributor but that doesent help the idle. Where do I go from here?

 

Sounds like you got air bubble in coolant system. Its called air locked. Remove radiator cap. Let engine warm up to let thermostat open. The cooling system will be at full flow allowing full circulation of coolant. This should work out any air trapped in the system.

 

Thanks for the reply. Air bubble was the problem. I left the radiator cap off while I let it idle for a while, till I seen that the engine had started to warm up and the coolant was circulating in the radiator. Continued to let it idle for a few minutes and the temperature gauge never moved passed half way. Running cool now. Still having trouble with the idle though, but I always have, its either to high or to low never where it needs to be. Think its time to rebuild the carb.

 

glad to hear its not overheating anymore. And good luck with the idle. Seems like every yota i owned never idled perfect. Might be just a yota thing like the "tick", who knows?

 

If air lock is really bad you can take the cap off and hold the rpms at 3-4k, makes a huge mess but it gets that tricky air pocket out if doing at normal idle doesn't.

I had to do this on my tracker twice because it just wouldn't come out, even if I inclined the car so the radiator sat higher.