Coolant squirt out overflow tube

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Bob McCarty
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Coolant squirt out overflow tube

Postby Bob McCarty » Tue Aug 18, 2015 5:59 pm

I had been mowing with my '64 for about 30 minutes when a 1/4" stream of coolant came out the hole where the overflow tube attaches (it's missing). The stream was strong enough that it shot past my left shoulder about six inches out. I shut down the mower and throttled back to head back to the barn. I had flushed and refilled the system about a month ago so it may have had a little too much coolant in it. The radiator cap that came with it has a spring, so I assume it's for a pressurized system. I don't think the '64 is supposed to have that but I didn't think it would matter that much. I've refilled the rad and switched caps. Not having heard this incident described before, I thought I'd check and see if anyone has had it happen before. Any suggestions on other causes would be appreciated too.

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Re: Coolant squirt out overflow tube

Postby tst » Tue Aug 18, 2015 6:25 pm

run it with out the cap on it and watch for bubbles in the coolant, if you have something like a bad head gasket it could build pressure in the system

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Re: Coolant squirt out overflow tube

Postby Boss Hog » Tue Aug 18, 2015 7:32 pm

most likely just too much fluid in the radiator Bob. wrap a rag around it until you put a tube on it :D I ran a 140 like that for 10 years, then sold it , with the rag still on it
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Re: Coolant squirt out overflow tube

Postby randallc » Wed Aug 19, 2015 3:32 am

Just leave the radiator cap loose and let it finds its level. But do keep a check on it. It should level out just above the fins.
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Re: Coolant squirt out overflow tube

Postby Matt Kirsch » Wed Aug 19, 2015 7:35 am

Even if nothing is wrong, the pressure will build in the radiator as the coolant warms up and expands when you have a pressurized cap. When it reaches the limit of the cap, the cap will allow excess pressure to escape out the overflow. If you've overfilled the radiator, you get a squirt of near-boiling-hot coolant.

If the cap was non pressurized, it would just dribble.

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Re: Coolant squirt out overflow tube

Postby Mike in Louisiana » Wed Aug 19, 2015 9:02 am

Bob, Were you on flat ground. mine does not have the overflow tube either. The road ditch is just barely to steep to go side ways. If I go straight down the hill fluid will shoot back at me like yours did if the engine is warmed up. I just go up the hill and all is fine.
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Re: Coolant squirt out overflow tube

Postby Bob McCarty » Wed Aug 19, 2015 9:21 am

Mike, I was mowing on flat ground. I'll watch for bubbles that would indicate a bad head gasket. Hopefully it was just spitting off excess. I just wouldn't have expected a horizontal squirt that made it past where I was sitting.

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Re: Coolant squirt out overflow tube

Postby Jim Becker » Wed Aug 19, 2015 10:22 am

Mike in Louisiana wrote:. . . The road ditch is just barely to steep to go side ways. . . .

As illustrated here?
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Re: Coolant squirt out overflow tube

Postby cavingreer » Wed Aug 19, 2015 2:24 pm

@ JimBecker - YIKES!
When I first ran mine around the yard the other day I filled it up to the neck and it dribbled and dripped non-stop and was spraying on the alternator and front of the engine. No overflow tube on mine either and a non-pressurized cap. Been raining here ever since so I haven't been able to get back to it and figure out if that was just overflow or if I screwed up the tower clamp on the water neck and it won't seal.
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