Draining a D4 7U for the winter.

It's been a while since I have drained out a 7U, there is a plug to remove on the left side of the diesel engine block close to the injector pump area. It is by itself on the side of the block.

The got ya on these and the d2 can be sludge and gunge blocks the water narrow passage under the pony so some water stays in it causing frost damage , if there is any doubt I would pull the pony heads and if there is gunk poke some wire thru it and then flush by filling the radiator....

I am a firm believer in keeping the cooling system full with an antifreeze mixture to eliminate freezing and also to prevent oxidation and corrosion of the system

Absolutely! Expensive the first time but I never change it regardless of the manufacturers advice. Just add additive every Fall.

Here are pictures from Operator and Maintenance Instructions, form 12244-7.

There is a vent on the top of the starting engine that needs to be open when refilling to insure that water jacket on the starting engine is filled.

I completely missed the block drain. I was looking for a valve or something that looked like one. I thought that "bolt" held something in the engine. With the water pump leaking, I didn't want to put 50/50 in the radiator and have it leak out. I suppose I could fill it, run it, and drain it into a container to be returned when the water pump is fixed. Or pour straight anti-freeze into the vent on top of the pony. I have a manual #104 and a parts book UEO32523, but none of them showed the location of the drain. I guess I'll have to get 12244-7 to get the full picture. Thanks for the information.

I got many gallons of used antifreeze from my auto mechanic for free as he always had to pay to get rid of it.Try some mechanics in your area and Pour that in the block and if it leaks out no loss! I filled my tractor tires for free that way.

I got many gallons of used antifreeze from my auto mechanic for free as he always had to pay to get rid of it.Try some mechanics in your area and Pour that in the block and if it leaks out no loss! I filled my tractor tires for free that way.

That is a great idea, recycling !