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allencl
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143 Posts
Initially Posted - 04/28/2002 :  16:02:55  Show Profile  Visit allencl's Homepage
Outboard buffs please advise:

I'm changing out the water pump impeller on my 87 Yamaha 9.9 hp fourstroke. The impeller looked fine, but what the heck it hasn't been changed in the three years I've owned the motor. Judging from the perfect paint on the lower unit bolts, I'm not sure it's ever been changed. Anyway, with the lower unit off, I observed that the shift rod seal is leaking a bit of gear oil (enough to trickle out the water drainage hole on the leading edge of the lower unit). Is this a problem? I'm having difficulty removing the seal for inspection. There is a single screw, which is easily removed, but I have been unable to then pry the seal off.

By the way, when I last changed the gear oil it was milky white, indicating water intrusion. I attributed that to a torn gasket on the gear oil drainage bolt which I of course replaced. But now I'm wondering if water is getting in through this shift rod gasket.


Lower unit:
<img src="http://home.ptd.net/~allencl/pics/lower unit 1.JPG" border=0>

Shift rod and drive shaft (with water pump impeller and housing removed):
<img src="http://home.ptd.net/~allencl/pics/lower unit 2.JPG" border=0>

Shift rod seal with screw:
<img src="http://home.ptd.net/~allencl/pics/lower unit 3.JPG" border=0>

Thanks for any thoughts,

-Chris on "SPIRIT" C25 SR WK #5644
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.