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430 garden water temp a gauge

B

b79holmes

Member
We have a 430 and no idea if it runs hot or not (it just seem hotter than gas) or how to tell. If we used a infrared temp gun any idea what the running temp should be?
We have not run it for hours at a time but when we do, if an idiot light is out overheating is our biggest risk.
Can we attach a gauge to the idiot light sensor? Any idea where it is ?
Anywhere else to install a temp gauge?
Thanks,
Bill
 
If radiator is clean operating temperature of engine is around 160-180 degrees. Idiot light comes on around 230 degrees if I remember right. I guess you could add a temperature gauge port on engine is M16x1.5 sensor port is on the thermostat housing.
 
You can replace the light sensor with a temp sending unit and electric gauge, or a mechanical gauge if there is room behind the threaded hole for a sensor bulb and you can find a metric thread fitting. Avoid extension nipples and fittings. A short extension is ok. The sensor needs to be near the heat source.

If you move the sensor location, be sure to keep it in the head or thermostat housing area, not down on the block or water pump. It will give false low readings.
 
If you have a liquid cooled engine, you can get a radiator hose temperature sensor housing (check ebay or amazon, many sizes available, most under $10) and splice it into the upper radiator hose. Then you get a cheap electrical temperature gauge (less than $30) and a sending unit (about $10). The electrical sender unit is a standard size, 1/8 NPT, that fits in the housing. Most of the housings are not big enough to work with a mechanical capillary sending unit. I recently installed this setup on my JD 850, because I didn't trust the idiot light. I liked this approach because you are only altering the radiator hose. So far it works great.
 
Our 4600 is a Yanmar engine like yours, and it seems to run a little cold, but it always comes up to the same spot on the gauge, and stays there while operating regardless of load, so all is well. I checked it once with a heat gun and it was a little on the cool side, but was told that's OK, and it has been for 20 years. If your worried about it check it with a heat gun for hot spots, and then put some kind of gauge on it as suggested.
 


The standard thermostat is 160 F, with an optional 180 version available as a replacement.

If you do have a "temp gun", check the thermostat housing to verify that the operating temperature is in that range. (check the lower part below where the gasket is where the water outlet fitting attaches.)

As a test, the temperature sensor is in the lower thermostat housing, if you take the wire lead off of it and touch it to a good ground (with the key switch "ON") the temp warning light should light.

That proves that the lamp and wiring are functional, but (of course) doesn't prove the sender itself is working.
 
My son has a temp gun so we will try that.
We have a 2040 and my old neighbor has a 4200, both of which I have run for hours at a time.
The 430 just feels hot but maybe we are just so close to the engine.
We will try these suggestions.
Thanks.
 
For maximum efficiency of a gas engine, is 160F (mentioned in some replies) not somewhat on the cool side? Most car manufacturers for example recommend between 175 and 195. Maybe tractors are different but I have no idea why if that's the case.
 


I assumed it was a Case since the neighbors had one and after they went out it went to another neighbor where it still sits.
 
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