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FJR Motorcycle Forums
Technical & Mechanical Problems
Water pump Failure?
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<blockquote data-quote="Fred W" data-source="post: 1159462" data-attributes="member: 3828"><p>Depends on what color the mung is.</p><p></p><p>The water pump shaft has two seals separated by a small space and the weep hole between them (has a short drain line on it). The inside seal is the oil seal. The outer seal is the coolant (mechanical) seal. If the mung is oily you have an oil seal failing. It is just like any other rubber (neoprene) oil seal and will just continue to get slightly worse over a long time period.</p><p></p><p>If the mung is coolant colored it is the mechanical seal (a far more common failure). The mechanical seal is a spring loaded ceramic flat washer like surface that contacts a mating hard rubber seal that spins against it. These are a common failure on all bikes that have them and will generally weep for a really long time before a full failure. I'd feel comfortable going a few thiousand miles with one that is weeping. Just keep an eye on the coolant level in the reservoir and top it up as needed.</p><p></p><p>Now, if the mung is oily and coolant I would not wait as that means you have both a coolant and an oil seal problem and the coolant could work its way into the engine crankcase oil. This would be a pretty rare occurrence (a perfect storm?) so probably not your situation. Just watch out for any milky appearance in your oil sight glass.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1159462, member: 3828"] Depends on what color the mung is. The water pump shaft has two seals separated by a small space and the weep hole between them (has a short drain line on it). The inside seal is the oil seal. The outer seal is the coolant (mechanical) seal. If the mung is oily you have an oil seal failing. It is just like any other rubber (neoprene) oil seal and will just continue to get slightly worse over a long time period. If the mung is coolant colored it is the mechanical seal (a far more common failure). The mechanical seal is a spring loaded ceramic flat washer like surface that contacts a mating hard rubber seal that spins against it. These are a common failure on all bikes that have them and will generally weep for a really long time before a full failure. I'd feel comfortable going a few thiousand miles with one that is weeping. Just keep an eye on the coolant level in the reservoir and top it up as needed. Now, if the mung is oily and coolant I would not wait as that means you have both a coolant and an oil seal problem and the coolant could work its way into the engine crankcase oil. This would be a pretty rare occurrence (a perfect storm?) so probably not your situation. Just watch out for any milky appearance in your oil sight glass. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Water pump Failure?
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