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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Bought a fake 743b that's a 743 - need manual
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<blockquote data-quote="Dave1234" data-source="post: 134053" data-attributes="member: 23099"><p>Bobcat's placement of the overflow tank below the radiator means that sucking fluid back in as the engine cools is hard. Any air leaking anywhere else will be easier to suck in than the heavier water/antifreeze. And if expelling coolant from such leaks is easier than overcoming the radiator cap's spring pressure, you will slowly loose coolant, eventually overheat and likely ruin your engine if you fail to note the rising temperature. Since you had to make your own overflow tank, I would recommend trying to mount it outside the engine compartment and more on level or above with the top of the radiator. You obviously know coolant should be entering and exiting the overflow each heat cycle, but isn't. I'd look at the water pump as the most likely source, either the faulty use of silicone rather than a proper gasket, or a failing shaft seal, or both. Someone probably pulled the water pump off and reinstalled it without a new paper gasket for some reason, and often as not silicone is crap. And, nobody unbolts the outside screen cover to check coolant levels very often. Its a bad design compounded by the overflow tank mounting location that needs a work-around.</p></blockquote><p></p>
[QUOTE="Dave1234, post: 134053, member: 23099"] Bobcat's placement of the overflow tank below the radiator means that sucking fluid back in as the engine cools is hard. Any air leaking anywhere else will be easier to suck in than the heavier water/antifreeze. And if expelling coolant from such leaks is easier than overcoming the radiator cap's spring pressure, you will slowly loose coolant, eventually overheat and likely ruin your engine if you fail to note the rising temperature. Since you had to make your own overflow tank, I would recommend trying to mount it outside the engine compartment and more on level or above with the top of the radiator. You obviously know coolant should be entering and exiting the overflow each heat cycle, but isn't. I'd look at the water pump as the most likely source, either the faulty use of silicone rather than a proper gasket, or a failing shaft seal, or both. Someone probably pulled the water pump off and reinstalled it without a new paper gasket for some reason, and often as not silicone is crap. And, nobody unbolts the outside screen cover to check coolant levels very often. Its a bad design compounded by the overflow tank mounting location that needs a work-around. [/QUOTE]
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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Bought a fake 743b that's a 743 - need manual
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