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To service the water pump no. Should take you less than an hour to R&R the impeller...as for the seals.... Take a radiator pressure tester and make an adaptor to pressurize the lower unit through the drain plug screw. (I think it is 3/8 18 thread) Pressurize it to no more than 15 psi, rotate all shafts and work shifter forward, neutral, reverse checking for pressure loss. The driveshaft and shift shaft seals are easy. props haft seals will require special tools or inginuity

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I sorta figured the water pump was the easy part. I've already checked for seal leakage after I found water in the gear oil. I used a vacuum pump instead of pressure. Zero vacuum.... The seals are more than likely original so they need to go.

Got plenty of ingenuity

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Sorry ,after a re-read I saw you were doing the water pump. It's a very simple job. When you are removing the bolts holding it on , there is one hiding under the skeg fin. Wiggle the assembly down until the shaft clears. I hold mine in a old workmate table. The 4 or 5 screws come out and the cover comes up. Watch the seal ,don't scar it. The impeller has a key. re-install with the impeller twisted like the old one came out.
I've seen a couple really worn out ones and some that looked good ,replace it anyway.

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