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FJR Motorcycle Forums
Technical & Mechanical Problems
Water Pump Weeping after 160,000 Miles
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<blockquote data-quote="Fred W" data-source="post: 1146686" data-attributes="member: 3828"><p>Matt, that is not atypical for any bike's waterpump. There is a mechanical seal for the pump shaft that often fails by weeping from the drain hole. It is basically a smooth spring loaded ceramic disk that another disk on the pump shaft contacts and spins against.</p><p></p><p>There are actually two seals, the mechanical coolant seal on the outer (water) side, and another, typical oil seal on the inner (oil) side, separated by a small space, and that is where the weep hole drain is, in between the seals. Ypou can go a long way on a weepy pump seal as you never really lose all that much coolant and it is unlikely to just rupture completely and gush all your coolant on the side of the road.</p><p></p><p>But changing the seals (I'd go ahead and do them both since you'll have the pump off and apart) is not a very big deal. Just did one on my Man'Strom about 6 months ago, but they are all pretty much the same basic design.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1146686, member: 3828"] Matt, that is not atypical for any bike's waterpump. There is a mechanical seal for the pump shaft that often fails by weeping from the drain hole. It is basically a smooth spring loaded ceramic disk that another disk on the pump shaft contacts and spins against. There are actually two seals, the mechanical coolant seal on the outer (water) side, and another, typical oil seal on the inner (oil) side, separated by a small space, and that is where the weep hole drain is, in between the seals. Ypou can go a long way on a weepy pump seal as you never really lose all that much coolant and it is unlikely to just rupture completely and gush all your coolant on the side of the road. But changing the seals (I'd go ahead and do them both since you'll have the pump off and apart) is not a very big deal. Just did one on my Man'Strom about 6 months ago, but they are all pretty much the same basic design. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Water Pump Weeping after 160,000 Miles
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