February 23, 20206 yr A quick search revealed nothing so here goes. Anyone had any luck replacing the water pump seal without splitting the case on a 4RT or the like? I hear rumors that is has been done but find nothing to back that up. I have the gaskets and such to split the case but I also have a trip pending this coming week and not a lot of time. I am hoping to be able to do the short fix then split the case and replace the oil seal as well once back from the trip.
February 25, 20206 yr No, you'll need to take the full clutch cover off to get at the seals. What age is the bike? If it's done a lot then you're probably better off replacing the shaft too as they get badly scored from the seals
February 25, 20206 yr Author 1 hour ago, jrsunt said: No, you'll need to take the full clutch cover off to get at the seals. What age is the bike? If it's done a lot then you're probably better off replacing the shaft too as they get badly scored from the seals Yeah. Once I dug in it was clear that pulling the primary off was the easier way to go. Bike is an 06 but with super low hours for a bike that age. The impeller shaft looks good.
February 26, 20206 yr I would be replacing the shaft , lets face it, the seal hasn't just gone has it, something has made it leak, probably the shaft, no?
February 26, 20206 yr Author 8 hours ago, monteeman said: I would be replacing the shaft , lets face it, the seal hasn't just gone has it, something has made it leak, probably the shaft, no? Unfortunately I could source all the parts in time for a trip this weekend with the exception of the shaft. Since the shaft has no scoring I decided to replace the oil and water seal and the bearing. Pulling the primary is not that much work so if it starts to leak again I will just do it all over including the shaft.
February 27, 20206 yr I would think that maybe the seal has gone hard after sitting for a long time between rides, so the shaft maybe OK ? Edited February 29, 20206 yr by eagle8 wrong word
February 27, 20206 yr Author 7 minutes ago, eagle8 said: I would think that maybe the shaft has gone hard after sitting for a long time between rides, so the shaft maybe OK ? That is the theory I am working with. The bike is an 06 that I picked up in 09 with very limited hours. I rode it on trails for a few years then it sat dormant, with the exception of 2 x times a year driveway ride. Last September I started riding it in trials and it has seen 85 hours since then. Given the appearance of the shaft logic holds that the seal(s) had deteriorated and hardened up.
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