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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Coolant leak
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[QUOTE="jmics19067, post: 700547, member: 27963"] The oil is incidental contact in that area while the water is getting pumped thru so the action of the water pump pushes the water thru the seal.Also since the cooling system is a closed system it will build pressure as it gets hot, the transmission is vented so it will not build pressure. If the seal is bad the pressure from the cooling system will push the water thru it. Plus the fact that the coolant is stored up higher in the radiators, any way you look at the coolant has more pressure helping it make it a one way scenerio. a bad head gasket on a four stroke could easily have oil in the water because the oil pressure would be greater than the coolant pressure. The easiest way to check would be too drain the oil, fill up the coolant, using a pressure tester pump up the radiator to whatever the pressure rating is on the cap and see if water comes out your oil drain hole. It will be either the water pump seal,the gasket for the clutch side case cover if the water passes thru it, or the side covers themselves leaking the water. On your two stroke the engine is separated from the transmision oil.which you know because you suspected the rights side engine seal causing the smoke. If the condition of your engine was so bad that enough water went thru the engine,head /base gasket and thru the right side seal in that direction I highly doubt that the bike would run. Where as if the water pump seal went bad contaminated your oil, raised its level up with something that isn't a good quality oil, ruining the seal and passing into the engine a more likely direction. Either way I would replace the water pump seal , right side engine seal and inspect the bearings in the engine and the piston closely because wherever the water was oil wasn't. The transmision should survive the water better than the engine. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Coolant leak
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