Looking for help on running down a small coolant leak. Leak is a drip behind the crank pully. I had the leak before I replaced the water pump. Leak occurs after have mixed driving in warm weather with the engine off. I have looked all around the thermostat housing and all is dry. Any ideas? White residue is not helping me track it down.

 

Try checking out the tube on the front cover that the heater hose hooks onto. It can run down the back of the tube and worm it's way down. It has an o-ring to seal it. Or it could be the front cover worm gasket, I would be praying it's the tube. A lot less work to fix.

 

I had a brand new water pump leak at a factory installed plug that gets installed in those pumps. It wasn't much, but changing water pumps the second time fixed it. The leak was so slow, I was temped to see if it would eventually fix itself.


I think I still have a small leak coming from the outside of my heads. Its not coming from the head gaskets. From a boroscope, it appears to be coming from the front freeze plug on the passenger side head. Once I new it wasn't a head gasket (I'm no original head bolts) I decided it didn't annoy me enough to try and fix it.

 

The big o-ring between the front cover and the intake manifold?

 

read it wrong...

 

Could be the large oring on the intake for the water passage.

 

BTW if it is that big Donut O-ring you can get it in the
EGR cooler instal kit or at IH by it's self for a lot less.
The EGR kit is also less at IH.

Then there is the small O-ring that is on the heater core feed where
is comes out near the glow plug module and goes into the front cover
just below the alternator.

Sean

 

Had this happen on an '05 I was working on...

We got the truck back together after replacing the oil cooler and road testing it twice to be on the safe side. Just after the second road test, coolant started leaking at a reasonable pace from area around the water pump. As it turns out, the issue was the clamp and the fact that the upper radiator hose wasn't fully seated. After fully seating the hose and tightening down the clamp, the leak was gone.