Re: Overhearing engine

Posted by Steve@Advance on July 10, 2016 at 14:47:45 from (107.203.134.67):

In Reply to: Overhearing engine posted by oj on July 10, 2016 at 10:19:29:

You say these combines have a history of over heating. Are you saying other combines like yours have incurable over heating problems? If so, then you are probably right, there is a design problem.

Adding a radiator is an extreme measure, but if you have room it would be a viable solution. But I would exhaust every other attempt first!

Have you checked for proper circulation? With the engine up to temperature, you should be able to see fairly turbulent circulation looking into the cap opening. One thing that has been done with some success is to drill a small hole, 3/32" or so, the the thermostat. That allows the thermostat to remain in place, but not create a total restriction when closed. It is a rare occurrence, but sometimes water pump impellers rust away, or spin on the shaft, or get fouled by some foreign object. A visual inspection would verify the condition.

The air coming through the radiator should be uncomfortably hot. If it is only warm, the heat is not being removed. The upper tank should also be hot, and the lower tank considerably cooler. When feeling the front of the radiator core, the temperature should be even from side to side, progressively getting cooler as you go down. If there are cold spots, the core is partially clogged.

How is the air flow through the radiator? Is there a well fitting fan shroud? Is hot air being recycled from the engine compartment? Would a performance fan help move more air?

There is a chemical test for combustion gasses in the cooling system. This is a reliable way to determine if there is a head gasket problem of cracked head. Has the head ever been off? Could there be clogged water passages between the block and head? Some engines use a coolant distribution tube to ensure even cooling, (not sure of your application). It could be clogged or rusted away.

If a second radiator is added, it would need to be carefully and properly designed and protected so as to not be a source of additional problems. It would need to be seriesed in, as in all the coolant would first go through one radiator, then to the other. That would mean all hoses would need to be the same size. Then there is the issue of 2 radiator caps. If at all possible, the lower mounted radiator should not have a radiator cap. The opening could be plugged with a rubber expandable freeze plug. Radiator caps are not 100% sealed. They have a check valve that allows the pressure to equalize when the engine cools. When that check valve is not under pressure, it is open to the overflow tube, which would result in a leak.

Let us know what you find!

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