D4 block heater

Most of em used an external circulating type.
Try Googling the "Watlow" brand......if I got the name right😊

Cowboy, MB. Cat hooks up the heaters as shown in the two photos linked below. I plan on doing the same to my D47U when I can get to it.

Looks like a pretty easy installation except for drilling and tapping the head of the pony 1/2" NPT. The other end attaches to the lower radiator supply at the tapped hole that is already there.

These are John's (MB. Cat) photos.

http://img217.imageshack.us/my.php?image=d2heater01wn5.jpg

http://img217.imageshack.us/my.php?image=d2heater02yp7.jpg

I have several Kats that seem to work OK.

http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200339137_200339137

On the "U" models it's more common to run a circulation circuit from the flange on the side of the thermostat housing to the pipe plug fitting on the lower radiator pipe.....no taping required.

OM, That looks like it would be even simpler. I was wondering if that would work. Looks like all one would have to do is drill a hole in the flange cover plate and weld a coupling to the plate or even a short nipple for that matter.

On my 7U I ran a hose from the plug on the lower radiator hose to the drain vent on the top of the starting engine. The water circulates nicely through both engines.

That will work to.....but be sure to check either approach to see that the pony cylinder area is getting heat and not plugged up with the usual sediment😊 😊

Thanks for the info. I would like to find an element to screw into the lower pipe. Dont know if anyone makes one.I have two of the tank type on other equipment.

The last 7U that I bought has an inline heater plumbed from the lower pipe to the left side of the block, right behind the governor.