The Official Extinct Inline Thermostat Mod Thread
Camel Trophy
Joined: Sep 2017
Posts: 3,815
Likes: 1,331
From: Mission BC Canada
@Extinct Just bad luck, I would have caught it quicker but coolant started back flowing I had pop out of the cab and deal with that. But man I cannot believe how cool it runs with no thermostat, run her up 2500 RPM and the temps kept dropping, I guess everything else is good shape. 
Camel Trophy
Joined: Sep 2017
Posts: 3,815
Likes: 1,331
From: Mission BC Canada
@Extinct Just to confirm, as I can pick a 180 up. Short end of the thermostat points to rad long end to engine.
From another site, italics are my comment
From another site, italics are my comment
According to my paper manual the book says the hot light (high engine coolant temperature warning lamp) will come on when the temp reaches 121C which is an astounding 250F; it goes back off when it goes down to 118C(244F). The thermostat is fully closed at 82C(179F) where it then begins slowly to open. It is fully open at 96C(204F). 244 is considered very hi normal that is nuts.
Rock Crawling
Joined: May 2019
Posts: 385
Likes: 199
From: Northern Virginia
I might throw in a bottle of water-wetter to see if I can drop the temps even more. I'm also going to check the ground on my Auto-meter gauge as well as the ohm resistant of the sensor. I would like to think a $200 gauge should give an accurate reading 
BTW, did you ever prototype a heavy-duty radiator for the D2?
Anyone here try this radiator?: https://www.allisport.com/shop/perfo...lloy-radiator/
Thanks again,
Tim B.
Last edited by TimInNova; Jun 23, 2021 at 09:15 AM.
Camel Trophy
Joined: Sep 2017
Posts: 3,815
Likes: 1,331
From: Mission BC Canada
@Extinct for you info
Got the temp thermostat in one small drip on the housing, using reusable gasket nothing serious. Idle temp 183 at 77F / 25C, bump the throttle to 2000rpm she jumps up to 185 the down to 177 pretty quick, never broke 188 after warming up. Rad cap loose.
Next up RTV the outer edge of thermostat housing to kill the leak and run a test under pressure but so far very nice.
It took me a year to get around to doing this, and @Extinct sending me a new thermostat after a year at his cost is outstanding service
Got the temp thermostat in one small drip on the housing, using reusable gasket nothing serious. Idle temp 183 at 77F / 25C, bump the throttle to 2000rpm she jumps up to 185 the down to 177 pretty quick, never broke 188 after warming up. Rad cap loose.
Next up RTV the outer edge of thermostat housing to kill the leak and run a test under pressure but so far very nice.
It took me a year to get around to doing this, and @Extinct sending me a new thermostat after a year at his cost is outstanding service
Pro Wrench
Joined: Apr 2018
Posts: 1,516
Likes: 442
From: SE PA
Check to see if the leak isn't from either the sensor port or the bulge in the radiator side of the housing where the hose slides on. I had this drip going on for a couple days and turned out to be both of those problems. I did not use sealant on the sensor port but ultimately some Teflon tape allowed me to seat it a little deeper and it stopped (I can't stand goopy sealant). Once that was solved I noticed that coolant was now/also getting by the radiator-side hose clamp. I cut the hose back beyond the nub and use worm drive clamps on both sides. I think I'm home free...
Yeah the sensor port = checked it and got it a bit tighter before Installed it. Had one clamp I had to tighten but the fancy gasket on both my units have yet to drip a drop. I also probably can tighten my housings a bit better as I'm running a bolt all the way thru then using a lock nut.