No thermostat?

[fj45ww]

I have a 1967 Land Cruiser (pickup variant) that has a 2F engine in it and I was planning to do a radiator flush because I saw some rust sledge on the underside of the radiator cap. After I pulled the lower radiator hose to drain out the coolant. I decided that I probably should put a new thermostat as part of a most robust maintenance. I removed the thermostat housing thinking that I would find a thermostat that could be replaced and it turns out that there's no thermostat in there. I'm curious what the best approach might be in this scenario. I'm new to land cruisers so just trying to understand the best path forward. I could just replace the thermostat housing as it was and continue on with my radiator flush or should I install a thermostat housing that has a thermostat?

 

[brian]

Put a thermostat in it, and be prepared for the engine to run hot.

 

[Living in the Past]

Not necessarily. The a working thermostat helps speed up warming the engine which is good thing. It also regulates the flow. Faster flow does not automatically mean better cooling. You want it to take some time in the engine and radiator to give the coolant time to absorb and release heat. The right temperature high or low is important. There is a reason in real cold climates they block the radiator. Cooler is not necessarily better.

 

[pb4ugo]

Now's the time to flush the rad and flush the heater hoses/cores. Install the tstat and fill the system distilled water. Drive it for a bit and see if there's any issues. If everything seems ok, drain and fill with a 50/50 mix with AF and distilled water.

 

[pb4ugo]

Now's the time to fush the rad and flush the heater hoses/cores. Install the tstat and fill the system distilled water. Drive for it for a bit and see if there's any issues. If everything seems ok, drain and fill with a 50/50 mix with AF and distilled water.

I always wonder why did someone remove the tstat. There might be an underlying issue, that's why I use distilled water.

 

[fj45ww]

Thanks for all the responses. Yeah, I suspect that there may have been some sort of heating issue with the truck which is why there is no thermostat in it to begin with. In that case, I think I need a little guidance. As you can see in the photos, there is no thermostat. I bought a thermostat but I think its the wrong one. Any idea on what is the right one for this thermostat housing?

 

[fj45ww]

Thanks for all the responses. Yeah, I suspect that there may have been some sort of heating issue with the truck which is why there is no thermostat in it to begin with. In that case, I think I need a little guidance. As you can see in the photos, there is no thermostat. I bought a thermostat but I think its the wrong one. Any idea on what is the right one for this thermostat housing?

This is the upper thermostat housing that I have Upper Thermostat Housing/Water Outlet - Fits 1981-1987 2F Engine Applications (RAD61110) - https://cruiserteq.com/upper-thermostat-housing-water-outlet-fits-1981-1987-2f-engine-applications-rad61110/

 

[charliemeyer007]

Maybe the missing one was stuck closed and they removed it to get home and never bothered to replace it because it ran.

 

[fj45ww]

Alright. I think I figured out what I need to buy in order to redo the thermostat.
- Upper Thermostat Housing/Water Outlet - Fits 1981-1987 2F Engine Applications (RAD61110) - https://cruiserteq.com/upper-thermostat-housing-water-outlet-fits-1981-1987-2f-engine-applications-rad61110/
- FJ60 2F Thermostat, Gaskets, and Hardware Kit • 1980 - 87 60-Series Toyota Land Cruiser RL1142 (CO1) - Red Line Land Cruisers - https://redlinelandcruisers.com/product/fj60-2f-thermostat-gauge-gaskets-and-hardware-kit-1980-87-60-series-toyota-land-cruiser-rl1142-co1/
- autozone.com/p/permatex-gasket-sealant-22071/516195?spps.s=5603&cmpid=LIA:US:EN:AD:ALO:GOO:TRS:SHO:OTE:GEN:NA:ALA:NA:NA:NA:NA:NA:NA:NA&gclsrc=aw.ds&gad_source=1&gad_campaignid=22356757832&gbraid=0AAAAADkcoVtX3XYpVxnlHdzIlOTJcVRsV&gclid=Cj0KCQjwyr3OBhD0ARIsALlo-OnIuRSyQWy3I9bYk6iqmGsHV93q0BgoW2KSgUh2Q6t1vE1opiNEJiMaAlwBEALw_wcB

 

[rlong]

I concur with Charlie, many times people pull them trying to solve another issue, doesn’t solve it (unless stuck/failed) they move on to b, c, x fix, maybe solve but never go back and replace thermostat. Pretty common and depending on your climate and use may not notice.

 

[Bearzerker]

Does anyone think there is much difference between the *80 verses *90C Aisin variants? I need to do mine as I seldom reach a quarter up the gage. I live in a chilly spot and am trying to make this a warmer winter. thx

 

[pb4ugo]

According to the internet you're going from 176f to 194f. It shouldn't be a problem. Just keep an eye on it. Or, You could cover a portion of the radiator with a piece of something like cardboard.

 

[charliemeyer007]

Make a curtain to block off the lower third of the radiator. Cardboard wrapped in trash bag will work

 

[Pighead]

Cardboard wrapped in trash bag will work

Plain ol' cardboard works too...

 

[Bearzerker]

Plain ol' cardboard works too...

View attachment 4239645

more my style!

 

[charliemeyer007]

Yea until it rains. The you cardboard bits clogging the fins. My favorite was a waterproof piece of a tent floor. Folded over a piece of paracord and tied to the supports. Fully adjustable from 40 below to 100 above zero.

 

[Bearzerker]

Yea until it rains. The you cardboard bits clogging the fins. My favorite was a waterproof piece of a tent floor. Folded over a piece of paracord and tied to the supports. Fully adjustable from 40 below to 100 above zero.

I am sure I can come up with something a little more durable and appealing. Would having headers and not exhaust manifold have any influence on running temps? I can detour this if it's too far in the weeds for this thread

 

[charliemeyer007]

I run a header. I made a copy of Man-a-fre's fluid heat riser, prevents carburetor icing in the fog. Once in low range low about freezing, pushing mud with the hubs I had to lower the curtain, then finally remove it or the rig wanted to run hot.

 

[VPP]

I have a 1967 Land Cruiser (pickup variant) that has a 2F engine in it and I was planning to do a radiator flush because I saw some rust sledge on the underside of the radiator cap. After I pulled the lower radiator hose to drain out the coolant. I decided that I probably should put a new thermostat as part of a most robust maintenance. I removed the thermostat housing thinking that I would find a thermostat that could be replaced and it turns out that there's no thermostat in there. I'm curious what the best approach might be in this scenario. I'm new to land cruisers so just trying to understand the best path forward. I could just replace the thermostat housing as it was and continue on with my radiator flush or should I install a thermostat housing that has a thermostat?

View attachment 4115211
View attachment 4115213

The reason no thermostat was in it is because the previous own could not find one for it. !970 was the last year I could find an aftermarket thermostat and I'm not sure it will work. If anyone has a picture of the original or parts book image, that will help It looks a lot like a NAPA 155 thermostat https://www.napaonline.com/en/p/THM155 in how the housing is designed, you might try that one, take the housing in with you. These are the numbers for the 1970
1970-1969; OE Type Thermostat ............................................. F13548 180
G13549 190
1970-1969; Thermostat Gasket ................................................ 25189

 

[Pighead]

Yea until it rains. The you cardboard bits clogging the fins.

Perhaps I've just had good luck picking cardboard but I've never had one fall apart before I tried to pull it out in the spring. Sure, it gets wet, but it sorta form-fits itself to the radiator and stays in place better.
I run headers and it gets chilly here, I just let it warm up well before driving, and use a piece of cardboard in front.