I have a 1973 Toyota Forklift with a 1.5 L (1,493 cc) 4P engine. I bought this out of a farmers barn, It ran fine when I first got it, but it would look like it would start to overheat. I changed the fluids in the engine, flushed the engine and radiator out, replaced all the water hoses to the radiator and to the converter. Now the water does not flow through the converter and it freezes up with in a few minutes. I do not see any water flow, or hot water in the radiator. The converter freezes and the engine dies before the engine gets a chance to over heat. I had a mechanic replace the thermostat, however, I do not know if it is in the correct direction. I am in the process of replacing the water pump, the original is off, it did not leak, does not look bad, the bearing grinds a little, I will replace it. I am in the process of removing the water pump housing, the channels do not look restricted, however, I do not have it all the way off yet, the bottom passenger side bolt is fused to the housing at the moment.
Questions: How to tell if the thermostat is installed correctly? Does the spring face down, into the engine, or face up into the hose?
Does anyone have any suggestions of why the water is not flowing through the converter, or the engine?
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Thank you for the info, I will look for this. The last observation I made was, no air in the cooling lines to the LP converter, the water just did not flow at all, it was as if it was stagnant.
most times after draining the cooling system you will need to bleed the air from the system. newer trucks have a bleed port by the water pump. on your older one while the truck is running slowly remove one of the cooling hoses from your l.p. converter. and watch for a steady stream.
a lot of times the converter sits up higher than the engine and that is where the air will go to get trapped.
Thank you very much for the info. I have the thermostat in correctly. The water was rusty looking, I used a radiator flush to flush it. When I get it back together I will flush it one more time for good measure. The blades on the water pump look in good shape, the bearing is going out, so I am replacing the water pump. I do not have a bypass line. I have several veins in the water pump housing. I am working on removing the housing, and I will make sure they are not restricted. I am now wondering if I had an air bubble in the water pump housing. I will make sure I do not when I re-assemble everything. I amaze myself sometimes, the steps I forget to take when I am a mechanic while I am working to get production out.
when installing the thermostat the sensor/spring side goes toward the engine block side.
When you replaced the hoses did you replace the bypss hose? it is a small hose connecting the waterpump and going to usually the block side of the thermostat housing.
what do the blades on the waterpump look like? are they worn off any? What did the coolant/water look like that you drained out? was it rusty looking? Was it rusty looking when you cleaned out the cooling system?
If you have alot of rust in the system you may have to run cooling system flush a couple times to get it cleaned out enough.
the freezing converter usually is because there is no coolant going through it, get the circulation part fixed and see if that fixes it.
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