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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Tohatsu, Nissan, Mercury OB tip		  New Topic  Topic Locked
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Davy J
Master Marine Consultant

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USA
1511 Posts
Initially Posted - 09/28/2012 :  07:09:47  Show Profile
I stopped by my local Tohatsu dealer to pick up a water pump impeller kit for my OB. Lately I've noticed that the water flow out of the motor was not as strong as it has been, so I figured that, at 4 years old, it needed a new impeller.

As I was paying for the impeller kit, the dealer said, that before replacing the pump, to check the little fitting at the outlet with a paper clip and make sure it is completely clear.

So I came home, fired up the motor, inserted a paper clip into the hole. Sure enough, a little blockage came out and the water stream is as strong as new. So I have the kit for when I need it, but I'll get to sail this weekend rather than changing out the impeller....
Davy J


2005 Gemini 105Mc
PO 1987 C25 #5509 SR/SK
Tampa Bay
Edited by - Davy J on 09/28/2012 10:34:13

delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 09/28/2012 :  10:00:13  Show Profile  Visit delliottg's Homepage
When you get around to replacing the impeller, learn from my mistakes & [url="http://catalina-capri-25s.org/forum/topic.asp?TOPIC_ID=25651"]use this thread as a guide[/url]. The instructions are at the bottom after I'd already gone through all the gyrations of doing it wrong the evening before. Sorry there are no pictures, but there is a reference to the parts guide with all the parts called out properly. I'm fairly confident that it could be done in 30-40 minutes now that I know how.

Hope that helps.
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Davy J
Master Marine Consultant

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USA
1511 Posts
Response Posted - 09/28/2012 :  10:33:47  Show Profile
Have you, or anyone else, changed the gear lube with the motor mounted on the boat while the boat is in the water? If so, how did you do it?
Edited by - Davy J on 09/28/2012 10:34:38
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 09/28/2012 :  11:18:45  Show Profile  Visit delliottg's Homepage
It's actually pretty easy to do while you're changing your impeller. Since you have to take the gear unit off with the drive shaft to get to the impeller anyway, you can just drain & fill the oil without much drama. It comes off the drive leg completely sealed & you can go work on the gear, propeller, zinc, etc. inside the cabin. I set mine up balanced on the top step of the cabin while I stood on the cabin floor so it was at a very comfortable height (my back won't tolerate being bent over for very long). Since I'd already removed the shifter retaining cover, it was easy to just pour the gear oil into the case from there, but you could just as easily do it like you're supposed to by removing the bottom gear oil bolt & draining it by cracking open the upper bolt. I'd have found someplace more suitable if I'd have done it that way so any spilled oil wouldn't have been on the cabin floor.

We did it with the outboard on the boat. I backed the boat into it's slip as far as I could get it with the engine tilted all the way up. It ended up over the dock by about 2-1/2 - 3' or so, so it was pretty easy to work on it from a low stool. The stern of the boat was only a few inches from the side of the dock, basically enough so the rudder wasn't being pinched & not much more.

Unbolt all the stuff per my instructions on the other thread, and the drive unit comes off with the gear case & propeller intact.
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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.