D7e 47a water pump seal problem

48A6393-up also shows a nut holding the impeller on the tapered shaft. There is a bolt on the other end holding the bearing and gear on.

It's possible that someone fixed a shaft with a stripped thread by boring and threading it.

The seal should not be affected by the rough shaft surface as long as the ceramic??? seat is attached to the impeller rear face like it is supposed to be. I have reattached the seat when it had come loose and gotten good service out of it. I have also seen impellers with the seat missing and the carbon seal running directly on the cast iron impeller. With the missing thickness of the seat, the seal couldn't last as long as normal since the spring and bellows assembly has only a limited travel.

What do the failed seals look like? I remember one on a 9U tractor that had apparently stuck and cracked the carbon ring when the engine was started up after an extended period of storage (sitting in field).

48A6393-up also shows a nut holding the impeller on the tapered shaft. There is a bolt on the other end holding the bearing and gear on.

It's possible that someone fixed a shaft with a stripped thread by boring and threading it.

The seal should not be affected by the rough shaft surface as long as the ceramic??? seat is attached to the impeller rear face like it is supposed to be. I have reattached the seat when it had come loose and gotten good service out of it. I have also seen impellers with the seat missing and the carbon seal running directly on the cast iron impeller. With the missing thickness of the seat, the seal couldn't last as long as normal since the spring and bellows assembly has only a limited travel.

What do the failed seals look like? I remember one on a 9U tractor that had apparently stuck and cracked the carbon ring when the engine was started up after an extended period of storage (sitting in field).

Is your cooling system being pressurized by gases coming by the pre combustion chambers ? Have had this with a 9u pushing water by the water pump seal because the over flow is rusted up and not letting the pressure escape.
Ray

You probably have a comtiminated cooling system .I saw that problem yrs ago .Tractors working in dusty conditions drew dirt into the system at the relief valve on top of the raditor . there,s a 1/4 " hole at the relief valve and dirt builds up in the hole as the tractor cools down in the evening. The water in the cooling system contracts ,the relief valve opens drawing in air and a small amout of dirt lodged in the hole day after day same thing happens adding dirt to the system .
Check the valve and you will find fine dirt in the relief valve hole and in the releif valve itself . I used to drill out and tap the hole to 1/4 pt thread ,and install a 90 degree elblow ,and a plastic filter that was used on the rear case as a vent for the steering clutches

I'll have a look at the relief valve today. There might be something in that. I have bars leaks in the system as the bottom of the radiator is rusting out, but i've had that stuff in for years. The seal this time looked ok. good enough to seal anyway. The last two times there was a chunk taken out of the smaller black ring & last time a big scratch mark on it. Not letting out pressure might be forcing gunk between the seal.

The water becomes very rusty and dirty almost straight away. I've often thought about a flush out. What sort of acid mix did you clean it out with? Is the water in your radiator clear now?