Farm Equipment - D17 IV Thermostat 160 or 180F?

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D17 IV Thermostat 160 or 180F?

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=67055
Printed Date: 24 Aug 2025 at 7:21am
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Topic: D17 IV Thermostat 160 or 180F?

Posted By: Stan R
Subject: D17 IV Thermostat 160 or 180F?
Date Posted: 17 Mar 2013 at 7:21am

What is better to put in? Thanks

Replies:

Posted By: DrAllis
Date Posted: 17 Mar 2013 at 7:39am

160F was factory installed......180F is if you want it hotter for maybe wintertime operation.

Posted By: Gerald J.
Date Posted: 17 Mar 2013 at 10:37am

160 for alcohol antifreeze, 180 for ethylene glycol (permanent) antifreeze and if you want to get it hot enough to boil condensation out of the crankcase. The engine efficiency will be a bit better with 180 as the cylinder walls and head will be a little warmer and so absorb a little less combustion heat.

Gerald J.

Posted By: DSeries4
Date Posted: 17 Mar 2013 at 10:43am

I put 180 in all of mine.

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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080