[Dave73TA]

I have a 73 400. New rebuild. Been running hot 235.Changed t stat 180 and drilled little hole in it.When gets to 180 seems to be ok goes down a little then justs starts getting hot.Put a new pump from napa on it. same thing. Bottom radiator hose cool when others are hot.Top of radiator hot bottom cool.After running there is pressure when remove cap.There is a high loop in one of the heater core hoses.Doesn t come from by plugs very back of head on the inside by intake.And the coolant doesn t seem to be flowing good in the rad. Now something else wen t wrong.Seen white stuff come out of breather. Checked oil higher than normal and white. Drained it came out white and 2 quarts over. Coolant in oil. Maybe blew a head gasket or there s a crack now.Any suggestions?

[GT182]

Sounds like a headgasket. That's one main reason for coolant in the oil pan. I'd pull the heads and check both first.

Sounds like the radiator is plugged. Have it boiled out first or recore it.

[77 Canamman]

Have you verified that the front cover does not have any corrosion holes? This can cause coolant to enter the oil on a Pontiac..

[Dave73TA]

Originally Posted by GT182

Sounds like a headgasket. That's one main reason for coolant in the oil pan. I'd pull the heads and check both first.

Sounds like the radiator is plugged. Have it boiled out first or recore it.

It s a new radiator.4 row.Pulled thermostat out and coolant flows . Thermostat does open in boiling water but when put in car doesn t seem to flow .I did wash my engine bay out the other day I think water got in the oil somehow from that.Changed the oil added comp cam additive seems ok for now will drain and replace with new oil.I will keep a look out on the radiator though. Maybe my water pump isn t good. Been reading about that. Had a 1/4 inch gap bought from napa.Thanks for the reply ! I ll see how it goes and keep a look out.

[Dave73TA]

Originally Posted by 77 Canamman

Have you verified that the front cover does not have any corrosion holes? This can cause coolant to enter the oil on a Pontiac..

What cover. The valley pan?I think it entered while I was washing the engine bay.I ll have to take it for a ride. I changed the oil seems ok. But after a test drive I ll know for sure Pullked t stat and coolant flows through radiator now. New pump and rad. But with t stat doesn t flow. Thanks for the reply !Second tstat so far have one more.160 Mr Gasket one. But for now no t stat.

[GT182]

Dave, even new thermostats can be bad right out of the box. I've had 2 like that in the last couple of years. Tho seeing you drilled a hole in it you might not be able to return it.

Test the next one before you install it.

[Dave73TA]

Originally Posted by GT182

Dave, even new thermostats can be bad right out of the box. I've had 2 like that in the last couple of years. Tho seeing you drilled a hole in it you might not be able to return it.

Test the next one before you install it.

I tested both of the ones I have now . They open at 180.Maybe it s the thing where the pump has to be a cardone or one from py. And bend in the devider plate so isn t a 1/4 inch gap . Thanks for the reply !

[sts]

The description I hear is a half gallon of cooolant in the crank case. The sounds I hear are a replacment pump. The only quesion left is did it pump a half gallon of coolant into the engine before or after the pump was replaced. I would say that it wasn't pumping a half gallon of coolant into the crank before the pump was replaced.

Golly gee! What would be my next step? I think I'd check the air in the tires.

[Dave73TA]

Originally Posted by sts

The description I hear is a half gallon of cooolant in the crank case. The sounds I hear are a replacment pump. The only quesion left is did it pump a half gallon of coolant into the engine before or after the pump was replaced. I would say that it wasn't pumping a half gallon of coolant into the crank before the pump was replaced.

Golly gee! What would be my next step? I think I'd check the air in the tires.

Jerk !

[77 Canamman]

Originally Posted by Dave73TA

What cover. The valley pan?I think it entered while I was washing the engine bay.

\

The aluminum front engine cover that the water pump bolts to.....

[Dave73TA]

Originally Posted by 77 Canamman

\

The aluminum front engine cover that the water pump bolts to.....

I ll check it out.Still don t know how it got in the oil. The person who rebuilt it is going to do a leak down test.Thanks Canamman !

[Dave73TA]

Originally Posted by Dave73TA

I ll check it out.Still don t know how it got in the oil. The person who rebuilt it is going to do a leak down test.Thanks Canamman !

Water in oil again.

[rad400]

Would a cracked block do this?

[Dave73TA]

Originally Posted by rad400

Would a cracked block do this?

Possible I got some investigating to do.Pressure test, heads check,Gaskets, block .

[GT182]

Has to be some kind of an answer for coolant in the oil pan Dave.

Retorq the intake bolts just for giggles and grins. I lost 3/4th of my coolant because they loosened up. Not likely seeing it's a fresh rebuild, but stranger things have happened.

[Dave73TA]

Originally Posted by GT182

Has to be some kind of an answer for coolant in the oil pan Dave.

Retorq the intake bolts just for giggles and grins. I lost 3/4th of my coolant because they loosened up. Not likely seeing it's a fresh rebuild, but stranger things have happened.

It s in the shop. The person who rebuilt it is going to take it apart. Thinks it a head Gasket.Thanks for the reply s and help !

[Dave73TA]

Originally Posted by 77 Canamman

Have you verified that the front cover does not have any corrosion holes? This can cause coolant to enter the oil on a Pontiac..

We took engine apart took oil drain out. Let eveything leak out .Checked heads and gaskets nothing wrong. Put together put fluid in no oil. next day took oil drain plug out and coolant came out. Leaked into block overnight. Changing timing cover. Thanks 77 . We think this is it .

[Dave73TA]

Originally Posted by 77 Canamman

\

The aluminum front engine cover that the water pump bolts to.....

Changed the timing cover . That is what it was . We had engine apart no oil drain plug out . Checked heads and gaskets nothing wrong . So put back together . put coolant in but no oil . did put drain plug in . next day took drain plug out coolant came out . Leaked in overnight .Took a scope in the fuel pump opening and saw coolant in timing cover area .Where it s not suppose to be !Got a timing cover and no coolant in oil anymore .Thanks Again Canamman 77 !Been driving it does run hot 200-215 but it is hot out and it s a rebuilt motor .Also digital gauges .