Re: Driveshaft water tubes, 18-35hp motors

[Mumbles]

quote johnyrude200:

The 9.9/15 upper driveshaft bearing housing (for lack of a better term) has a couple of other seals too. They don’t have a water tube like the larger HP motors, but this one (pictured) was seized up with salt up there.

Later 9.9/15’s, you’ll have to check which years, use two lip seals inside the crankcase head with no O ring on the shaft instead of one seal with an O ring. Besides making the shaft harder to install, OMC probably felt the O ring was unnecessary with two lines of defence below the splines. Using the later head on an early motor is a simple upgrade to do while the powerhead is off.