Question about thermodyne transmissions

[Geoff Weeks]

No, you can't fit that type in an older housing. That is a weir-stat and when "closed" all the coolant passes through the center back to the waterpump. The housings are machined totally different, with differing coolant flow passages. 

[Mack guy Ata]

- Mrsmackpaul thank you for the tips next time im doing aluminum welding i will make sure to follow these instructions.

- vladislav this is amazing thank you very much. Yes this is the type of thermostat i need its great to have photos of it will make finding one much much much easier 

[Mack guy Ata]

So a funny little update. You guys remember how i wanted a 20 speed on my truck and i might be wrong please correct me if I am. Took out the transmission today it turns out i actually have a 20 speed on it but the Lo-Lo and Lo-Split being stuck shot and the plate saying its a 9 speed. I remember someone actually telling me that i might have one on it with the wrong plate. I will share the photos i took it might be my lack of experience making me think i have a 20 speed. 
 

Another update on the truck The guy selling it to me instead that its a b85 but it is not its a b43 dont really change much for me and i was very suspicious of it being a b85 since I couldnt find any b85 with its configuration. 
 

Another question and maybe i should start a new post since this one is getting old but. The radiator fan is very oddly shaped distance between blades are different is there a reason for this or do i just have a terribly built fan. I will also uplod photos of it

[Mack guy Ata]

[Mack guy Ata]

Geoff weeks sorry missed your message. My housing looks like it was ment for a thermostat like that. But still asking around shops that work on the renaults to see if i can find a good match for mine

[Geoff Weeks]

Coupla comments. If you look at the line drawing Vlad posted, you'll see the thermostat goes in horizontal and the outlet to the radiator is in the center of the housing with a seal between the weirstat and the housing.

Yours is a conventional type where it sits with flow over the bulb and opens to the radiator through the "shutters" in the stat.  You'll need a different water manifold, T stat housing and plumbing to switch between types. It isn't simple, and finding the right 'stat for that housing would be much more simple.

Fan blades are made like that to reduce noise, nothing wrong with that type. They are common on engine without a fan clutch as they are turning at full speed (engine speed) at all times. 

[Mack guy Ata]

Thank you very much clearly i need to do my homework on the thermostats. Hopefully will find the right one.

Also thanks for the info on the fan blades too. 

[Geoff Weeks]

Pardon my bad drawing, I never was good at it.

With a weir stat, the coolant flow through the engine for a given speed remains constant, regardless of it the 'stat is open or closed or 1/2 way between.

With a conventional "stat" the flow is restricted to the small bypass line until the 'stat starts to open and more and more coolant goes to the radiator. 

The weir stat provides good flow all the time, so no "hot spots" when the engine is cold but working with flow reduced like can happen with a conventional 'stat.

It take a different housing to use one or the other, the seal around the weir is something not there in a housing that takes a conventional "stat.

weirstat.pdf

Edited 33 minutes ago by Geoff Weeks