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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

71 series Detroit Diesel coolant heater.

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JDknut

12-18-2006 05:17:52




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What is the best way to install a coolant heater or block heater on a Detroit Diesel 3-71? I don't see any "freeze" plugs on the block where normally one would install a block heater. I don't believe in ether after seeing what it does to engines so would rather plug it in to warm it. Thanks, much.




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NC Wayne

12-18-2006 21:58:30




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 Re: 71 series Detroit Diesel coolant heater. in reply to JDknut, 12-18-2006 05:17:52  
Look on the side of the engine where the blower is located. The water pump should be on the front of the blower and tied into the side of the block at that point. Just behind the blower, you should see an oval plate with two bolts in it. This is the "extra" passage into the water jacket. I've also seen some where you'll have a pipe plug in the oil cooler housing that can be fitted with a heater. usually though the "extra" passage is the one used. Davidson Sales is a distributor for Kim Hotstart products and should have just about any type of cold start aid you need.

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chip man

12-18-2006 12:35:45




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 Re: 71 series Detroit Diesel coolant heater. in reply to JDknut, 12-18-2006 05:17:52  
There is an engine coolant block drain plate that is held on with two bolts, the plate is replaced with the block heater made specifically for that engine. Phillips-Temro makes them. I would have to look in a book to remember exactly where the plate is.



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JDknut

12-21-2006 09:10:12




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 Re: 71 series Detroit Diesel coolant heater. in reply to chip man, 12-18-2006 12:35:45  
If you can find where that is, I's appreciate it. Looks like a block heater would be easier to install than a tank-type heater.



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formula3

12-18-2006 06:32:21




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 Re: 71 series Detroit Diesel coolant heater. in reply to JDknut, 12-18-2006 05:17:52  
there are no soft plugs on those engines you have to get a coolant heater that goes in the heater hoses or if there are none run a loop hose out of the water pump or coolant passages



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JDknut

12-18-2006 07:52:25




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 Re: 71 series Detroit Diesel coolant heater. in reply to formula3, 12-18-2006 06:32:21  
OK, I thought that might be the case, thanks for the input.



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JD dozer mike

12-20-2006 16:04:37




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 Re: 71 series Detroit Diesel coolant heater. in reply to JDknut, 12-18-2006 07:52:25  
inline katz heater availabel at napa about 40$, install in lowest radiator hose, on 371 should be near water pump i think



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JDknut

12-21-2006 09:12:13




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 Re: 71 series Detroit Diesel coolant heater. in reply to JD dozer mike, 12-20-2006 16:04:37  
The lower hose goes from the oil cooler housing right to the rad. I'm not sure if a hose type heater will heat that big block in North Country temperatures. I had one on a V6 Ranger one time and it was of limited usefulness. Thanks for the tip, tho.



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