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Farmall & IHC Tractors Discussion Forum

IH 684, d239 tank heater and coolant questions

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08-11-2016 08:46:52

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I have a late 684 with the d239 diesel. It currently has a coolant heater in the radiator hose however the heater is no longer working and the hose needs to be replaced soon. I would like to add a tank heater as I feel they work better however can anyone give me some tips on where best to plumb one in on this engine.

The tractor used to have the factory starting fluid system however it was disconnected before I bought the tractor. The tractor starts well even when fairly cold but a heater adds some insurance for winter and I prefer to warm the engine rather than using starting fluid when possible.
I will renew the coolant when I replace the hose and add a heater. Has anyone added a coolant filter to one of these motors or should I just continue to check the coolant occasionally with the test strips? The tractor doesn't get used a lot of hours but I want to keep it working well for many years!

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08-15-2016 18:10:37

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 Re: IH 684, d239 tank heater and coolant questions in reply to outdoors, 08-11-2016 08:46:52  
I'd go for the tank heater, have one on a D179 and no worries starting even with a working either injector.
On a side note, What is the story on Taylor's outside Tata, drove by there this weekend and lot is full of equipment and looks over grown and no trespassing signs up.

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caterpillar guy

08-11-2016 16:25:35

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 Re: IH 684, d239 tank heater and coolant questions in reply to outdoors, 08-11-2016 08:46:52  
We have had the lower rad hose heater for over 30years on our 574 we have changed it over the years as they go bad but work good there.

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08-11-2016 15:42:25

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 Re: IH 684, d239 tank heater and coolant questions in reply to outdoors, 08-11-2016 08:46:52  
Hi, my brother has a tank heater on his 684. It is plumbed with water heater hose from the plug in the water jacket on top right of engine with the heater hose thread down behind the fan to the top of the tank heater. The tank heater is mounted down between the starter and the injection pump. The bottom of the tank heater is connected to the block rain. The top of the tank heater has to be mounted below the lever of the block drain. Somewhere I have a photo of a tank heater mounted on a D-239 in a 574.


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08-11-2016 10:53:36

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 Re: IH 684, d239 tank heater and coolant questions in reply to outdoors, 08-11-2016 08:46:52  
Unless you are in a terribly cold area, I'd stick with the lower radiator hose heater. There should be no problem heating up a small engine like that with one.

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