350L leaking coolant into crankcase...Headgasket? Waterpump - Polaris ATV Forum
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post #1 of 6 (permalink) Old 08-13-2019, 04:15 PM Thread Starter
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350L leaking coolant into crankcase...Headgasket? Waterpump

1994 Trail Boss 4x4 350L

Have not looked into it real deep yet, will pressurize cooling system first, initial research shows Head gasket, Waterpump gasket, waterpump bearing, or possibly broken water pump. Am i on the right track?

Veteran Techs please chime in. No sense to reinvent the wheel...at my age anyway.

Thanks
DTLMG

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post #2 of 6 (permalink) Old 08-13-2019, 06:22 PM
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Hey Dave, post some photos when you get to diving into this one! We like pictures! And it is interesting to watch as you go through it. We get to learn with you.

Steve
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post #3 of 6 (permalink) Old 08-14-2019, 04:02 AM Thread Starter
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Quote:
Originally Posted by stave7119 View Post
Hey Dave, post some photos when you get to diving into this one! We like pictures! And it is interesting to watch as you go through it. We get to learn with you.

Steve
Will Do!

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post #4 of 6 (permalink) Old 08-14-2019, 08:32 AM
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Head gasket is not normally the cause of coolant into the crankcase - water pump seal most likely

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post #5 of 6 (permalink) Old 08-18-2019, 04:59 PM Thread Starter
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Repair in frame or remove engine? Passed PSI PRESSURE Test?

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Originally Posted by latebird View Post
Head gasket is not normally the cause of coolant into the crankcase - water pump seal most likely
I dove in a little deeper today, engine started right up and pee’d green on my garage floor. Removed the counter balancer drain plug and drained about four ounces of antifreeze out of it.

This is my first time doing surgery on a 350l. Is the water pump seal replacement easier with engine out of the unit? Pulling the motor sort of looks like a pain in the ass.. but so does trying to fix the water pump in the unit..

PRESSURE TEST OF COOLING SYSTEM...... I pressure tested the cooling system with 10psi introduced through the overflow tube adapter ( per Polaris tech manual) if the seals in the water pump are bad shouldn’t it lose pressure through the seals?

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post #6 of 6 (permalink) Old 08-19-2019, 10:25 AM
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Quote:
if the seals in the water pump are bad shouldn’t it lose pressure through the seals?
Yes, but sometimes they only leak when the pump shaft is turning

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