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 Yamaha 9.9 question		  New Topic  Topic Locked
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nate
Navigator

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240 Posts
Initially Posted - 06/11/2002 :  10:54:16  Show Profile
I have a 1987 Yamaha 9.9 on my C25. Recently while out on a daysail I noticed the usually brisk stream of water that exits the motor when it's running was mearly dripping. I consulted the manual and it suggested clearing the water intake holes if they were obstructed. They are fine and now I'm left with the feeling that this is probably the water pump!!
Have any of you folks had similiar exper. with this motor and what am I looking at in regards to repair costs. BTW: I pulled out the shop manual I have and decided a repair on the water pump was beyond my limited skills.
Any feedback is really appreciated. Thanks,
Nate
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Gary B.
Admiral

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USA
969 Posts
Response Posted - 06/11/2002 :  11:15:54  Show Profile
I'll bet it's the impeller IN the water pump. They are relatively cheap, and should be changed every so often. I just bought a new 9.9 in 2000, run in fresh water, so haven't changed it. I'll bet you could do it, but the shop shouldn't charge more than their minimum fee. I had a 1985 model until the new one....Don't overheat these suckers/ they're an expensive rebuild!

Gary B. Encore! SK/SR #685
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 06/11/2002 :  12:28:49  Show Profile  Visit Douglas's Homepage
Salt or fresh water ? If its salt water you might only have a cloged up system from the salt and associated corission it causes. I would check the thermostat. Do you flush your engine often and do you winterize it when not in use?

Doug&Ruth
Wind Lass
Tacoma Wa.
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nate
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240 Posts
Response Posted - 06/11/2002 :  12:36:34  Show Profile
Doug,
Fresh water...Lake Mead. Here in Las Vegas we don't have too many "winterizing" worries. I do start/run the motor every time I'm out at the marina, even if I'm not going for a sail. I learned my lesson last year about stale fuel and a gummed-up carb due to an extended period of disuse. I now use a fuel additive and try to run the motor a couple times a week.
Nate
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allencl
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USA
143 Posts
Response Posted - 06/11/2002 :  13:11:50  Show Profile  Visit allencl's Homepage
Nate,

I have the same motor that developed the same problem this spring. On mine, it turned out just to be some grit that had plugged the small rubber discharge hose that carries the telltale water out of the engine. Pull off the cowl and remove / inspect the two rubber hoses on the aft / starboard side of the engine block. Very easy fix if that is your problem. As you know, on our motors, even when they're cold the thermostat does not divert water from the telltale stream so I don't think the thermostat is the problem (unless I'm missing something there, Doug).

I also replaced the water pump impeller- the old one turned out to be fine, however. I've been told that the Yamaha impellers last much longer than OMC / mercury outboards, but I would say that's your most likely culprit if you're not finding a clog in the line. It takes a little bit of work to pull off the lower unit to get to the impeller, but it's really not too bad. The pump kit (including impeller and all seals) cost about $35 and I would guess you would be charged about one hour of labor to have a mechanic do it, so I'm guessing about $100 total.

Let me know if you want any tips on replacing the impeller.

Good luck,

-Chris on "SPIRIT" C25 SR WK #5644
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 06/11/2002 :  14:34:57  Show Profile
I have a spider that seems to think that the discharge port is his domain. I clean it out with a pipe cleaner, SOP. This offsets the convenience of an automatic choke!
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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.