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3600 overheating

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Author  [Modern View]

08-08-2016 07:07:38

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My 3600 gasser overheats after 20-30 minutes of work. At least a gallon of coolant is expelled thru the radiator overflow tube every session. I changed the thermostat but same problem. I removed the thermostat, same problem. With the engine running, thermostat removed, I cannot detect any flow while looking into the radiator . Shouldn't there be some flow, even when cold? The water pump is turning as it should and is not leaking. Is it posssible the impeller has dissolved/broken apart? Or is it more likely that the radiator core or block is plugged? I don't want to have to remove the pump if it's not necessary. Thanks for any help or advice.

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curt cooke

08-08-2016 07:29:29

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 Re: 3600 overheating in reply to beck55, 08-08-2016 07:07:38  
Beck, I had a similar situation with a machine. I disconnected the upper radiator hose from the radiator and put a plug in the radiator where the hose would be. Filled the system with water and fired the engine up. With no thermostat, the action of the pump should push water out that top hose. Only takes a second to check the action of the pump that way.

In my case, the problem was a simple one, the radiator was severely plugged externally. I've had other ones where the radiator was so severely plugged internally that water could not pass from the top to the bottom of the radiator fast enough and thus, it exits the overflow.

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08-08-2016 07:20:42

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 Re: 3600 overheating in reply to beck55, 08-08-2016 07:07:38  
I think you're on to something if you can't see any action in the radiator with the thermostat removed. To test the water pump, simply take a 0-100 or so PSI gauge and plumb it somewhere into the block or head, such as the drain cock or temp sending unit port. Start the engine and rev it up. Pressure should be roughly proportional to engine speed, and should max out around 25-40 PSI or so.

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08-08-2016 12:09:05

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 Re: 3600 overheating in reply to Bern, 08-08-2016 07:20:42  
Edit to my last post - you're not going to get much pressure with the thermostat removed, since a closed thermostat is what creates noticeable pressure in the first place.

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