im looking to buy a 1978 drott 40 on tracks but owner says it overheats after 20 minutes of running...he says when it reaches 190 he shuts it down...he seems to think its caused by a stuck valve in the hydraulic port...i dont see how that can be but what ever...i will check to see if the water pump is working along with air breather blockage, blocked rad and see if the therm is stuck....its a 4-71DD...what else should i look at?
drott 40 overhating
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