Block Heater for cold weather starting

With the B7100 engine you might have to find an inline radiator hose heater unless Kubota sells a freeze plug style heater. A high wattage heat gun aimed into the intake would help also. Switching to say Amsoil 5-40 diesel rated oil will also help.

Here are 2 inline block heaters for the lower radiator hose. The first is for 1 inch ID hose and the second is for 1.5 inch ID hose. I don't know what the inside diameter of the B7100 lower hose is.
http://www.ebay.com/itm/ATV-Snowmob...SAL-/200798082430?hash=item2ec07f957e&vxp=mtr

http://www.ebay.com/itm/LOWER-COOLA...876?pt=LH_DefaultDomain_0&hash=item1c21ff4d44

I just found this one that is a direct fit for your D750 engine. Found it on Ebay
http://www.ebay.com/itm/Kubota-Trac...her_Vehicle_Parts&hash=item2a0b621d0f&vxp=mtr

From what I read in the ad on ebay it said:
"Please make sure your engine is equipped with the 3/4"NPT block heater port before ordering"
So look on the block of the engine or head and see if you see a 3/4 pipe thread plug. Look on the sides of the block and behind the starter. Usually the hardest part is removing the plug from the block if it is rusty. Use some penetrant and carefully tap it with a hammer before trying to loosen it.
you route the cord from the heater so you can get to it easily and that it stays out of the engine pulleys.

Or use something like this..... installation is pretty easy.(I have a similar one)
http://www.northerntool.com/shop/tools/product_200339105_200339105

I use a block heater in my bx. It installes in the freeze plug. I keep it on a digital timer, so it goes on one hour before I wake and an hour before I get home from work. We even have them on our gas vehicles.

They are more effective than the oil pan heaters. The pan heaters only heat your oil. But the freeze plug heaters heat your entire block, since the fluid is throughout.

BEST Block Heater for cold weather starting

Suggestion based on experience with four different engines, two of them Kubotas. Forget the freeze plug insert type. Use the type that fits into the lower radiator hose. Works like a charm. Cheap, simple, easy to replace if it ever fails (ours hasn't in ten years, used every winter).

Best brand I've found is KAT's out of Tennessee (website if you poke around the 'Net). Often found at parts houses. Get the red plasti-paint coated NOT the aluminum baseball-shaped type that O'Reilleys' in this area cross-references. The aluminum one is a different brand with lower wattage output and on one of my machines the shape doesn't fit well compared to the KAT's "T" shape. Comes in sizes to fit hoses in quarter-inch increments. May have to order online or from parts house for smallest and largest sizes. Measure new hose for sizing as current hose will be distorted. Expect between $25 to $40 by size and place of purchase.

There's another type that screws into a port commonly found on the water pump housing of vehicles (reference Ford 300 6-cyl but unsure about Kubota tractors) but other than additional install labor there doesn't seem any additional benefit compared to the lower-hose install type.

We use 50-F as the cutoff. Around 50F I preheat at least 30-min; one-hr minimum from 35-50F; two-hrs minimum 25-35F. If have to use the machine early plan ahead and leave it plugged in overnight or use a cheap timer rated for the wattage of the unit.

I realize this preheat method is conservative but consider it cheap insurance to keep that engine in best condition possible with fewest cold starts. Have tested each machine and know will cold-start at -15F but don't like to unless real emergency.

Biggest problem is wind if in open or under shed. Drape a tarp over front and sides to keep wind from sucking heat out of block and she'll heat right up. In half hour you can feel the block get warmer.

With heater working at 0-F both ours will click the glowplug lamp on-pause-off just about as fast as can turn the key and fire right up with no smoke. Still need to idle to bring hydraulic oil up to temp before seriously loading system.

I made a ten-ft long cord-with-switched-plug that I plug into the extension cord then run the end down to the front tire and plug in the heater. This allows me to turn the heater off without drawing an arc at the wall or at the tractor and by looping through step or steering wheel prevents me from driving off with the extension cord if I get in a hurry.

Use one of the KAT's and you'll be happy. I get nothing from the manufacturer; just trying to help out a fellow Kubota-ite.

/s/Stub

Not sure if you're following the other thread on block heaters, but there is a cautionary note on magnetic heaters at the end of this thread.
http://www.orangetractortalks.com/forums/showthread.php?t=6035