Heater install on 853c

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skidsteer.ca

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Jan 20, 2006
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I'm in the process of adding heat to my 853. The Isuzu use a 7/8” hose that allows the water to circulate from below the thermostat to the cold return hose (big hose) from the rad when the themostat is shut. My heater will provide a parallel loop to and from the same points with 5/8 hose. ( I tapped a 3/8“ pipe nipple into the thermostat housing, just below the themostat and will return the water to the lower/ cold rad hose)
I was wondering if anyone knows if a restrictor is used in this appication? And if so, what diameter restrictor should go in the factory 7/8” hose.
This would help force more coolant throught the heater core, however it must be big enough allow enough coolant to circulate in the block when the heat is shut off and the heater core circuit is not flowing.
If not I'll install a valve in each line and do the trial and error thing.
Thanks
Ken
 

charger

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Dec 28, 2006
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74
so basically your tying in your hoses from under the thermostat housing,and your return line is going to the bottom of the hose?? if you install a restrictor in your heater line it will allow less coolant through the core (92 gm half tons had this and didn`t heat worth anything!) is there any plug you can remove from your water pump and tie into that?? might flow more coolant this way??
 

skidsteer.ca

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Joined
Jan 20, 2006
Messages
3,853
so basically your tying in your hoses from under the thermostat housing,and your return line is going to the bottom of the hose?? if you install a restrictor in your heater line it will allow less coolant through the core (92 gm half tons had this and didn`t heat worth anything!) is there any plug you can remove from your water pump and tie into that?? might flow more coolant this way??
No.
The restrictor goes in the loop that parallels the heater circuit, with the idea that restricting that loop will push more coolant through the heater loop. Yet when you turn the heater down (buy slowing the coolant through it, with a valve) enough water need to go through the bypass loop with the restrictor (not the heater) to keep the temp across the block (fairly) even until the thermostat opens, then while its open the majority of the water will circulate through the rad.
Anyway, I choked the bypass loop down to 3/8” from 7/8.
I'll put my temp gun on the heater hoses and compare the temp in and out. hopefully the two hose will be close to the same temp. If not I need more restriction in the bypass loop.
I have been though your door before Charger, I'll try to drop by sometime.
Ken
 

farmboy55

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Joined
Aug 16, 2006
Messages
324
No.
The restrictor goes in the loop that parallels the heater circuit, with the idea that restricting that loop will push more coolant through the heater loop. Yet when you turn the heater down (buy slowing the coolant through it, with a valve) enough water need to go through the bypass loop with the restrictor (not the heater) to keep the temp across the block (fairly) even until the thermostat opens, then while its open the majority of the water will circulate through the rad.
Anyway, I choked the bypass loop down to 3/8” from 7/8.
I'll put my temp gun on the heater hoses and compare the temp in and out. hopefully the two hose will be close to the same temp. If not I need more restriction in the bypass loop.
I have been though your door before Charger, I'll try to drop by sometime.
Ken
Keep us informed on the project. I have the same Bobcat & may put a heater on it in the future. dennis
 
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