I am planning to do the coolant change on our 81 12V-71 TA Detroit's soon.
Here is where I am at so far:One thing I am unclear on is the exact drain locations for the coolant. Our local mechanic has mentioned there are a handful and I wanted to reach out and see if anyone has a good handle on that so I can know right off the bat how to do it.
- I have found a local source for the Detroit coolant.
- I have also found 5gal containers and lids. The store is uline.com if you are looking for cheap pails!
- I found a local disposal place that can take up to 50 gallons per day.
- I also know each engine will be around ~25 gallons of coolant each.
Thanks for the help as usual!
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Thread: 12-71 coolant change details
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02-26-2018 06:48 PM #1
12-71 coolant change details
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Re: 12-71 coolant change details
Front of engine above main pulley. HE or HE piping. Oil cooler. Water jackets (2). Rear block (2); one is over and above the starter so protect it. I counted 7.
Semper Siesta
Robert Clarkson
ASLAN, 1983 55C #343
Charleston, SC
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02-26-2018 09:15 PM #3
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02-26-2018 10:19 PM #4Senior Member
- Join Date
- Apr 2005
- Posts
- 2,771
Re: 12-71 coolant change details
The drains have petcocks on them so you don't need to drop them into the bilge. My recommendation
would be to drain the old coolant and replace all the petcocks with new units that incorporate a small
hose barb that you can attach a length of hose for future easy clean coolant changes. It seems that
no matter how careful you are there will still be some spilled coolant with the original petcocks.
Walt
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02-26-2018 10:23 PM #5
Re: 12-71 coolant change details
While its out pipe a drain in it like Robert did. I wish I had seen his pictures before I recently changed mine. I will do this next time. I would get a couple of spare petcocks too in case one of them is frozen and needs replacing.
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02-27-2018 01:25 PM #7
Re: 12-71 coolant change details
Is it worth pulling the heat exchangers and getting them cleaned at that time as well? Seems like it would be easy enough to do. Anything else that would make sense while the coolant is out?
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02-27-2018 01:37 PM #8Senior Member
- Join Date
- Jul 2013
- Posts
- 1,188
Re: 12-71 coolant change details
Where are you located? I'm down in Florida and i used Napacool, available at napa and distilled water. Of course we don't really face many freezing conditions so it may not work for you?
EDIT: I have 8v-92's, may not be the same recommendations for 71's
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02-27-2018 03:48 PM #10Senior Member
- Join Date
- Jun 2017
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- 96
Re: 12-71 coolant change details
Only flush and fill with distilled water, PH too high in tap water. Get lots of cases of distilled water.