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 Catalina/Capri 25/250 Sailor's Forums
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 Outboard Maintenance & Repair		  New Topic  Topic Locked
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Phredde
Navigator

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125 Posts
Initially Posted - 03/11/2004 :  22:19:04  Show Profile
Does anyone have a good source, or maybe a website for basic outboard maintenance and repair? Other than buying the manual?

Specific problem: My Nissan 8hp is showing its age, and probably the lack of TLC too. The other day, all set for a great sail, was warming it up when after a few minutes it conked out. Was able to re-start a few times with the same result. Lots of white exhaust too. Fuel supply looked OK. But I noticed it seemed to be overheating, and it didn't seem to be drawing water and spitting it out the top like it normally does. Its in a salt water environment and I haven't been so great at flushing it with fresh water. So I let it cool off, then put the "mickey mouse ears" on it with fresh water turned up full. That got it to run quite a while, sounding normal, with a fairly steady stream of water coming out of the top. But took off the ears, tried it in the usual operating position in the bay, and the same result as before, run, intermittent spurts of water throughput, overheat, then conk out.

Should water be continuously spurting out the hole in the top? Is there a way to clear the water pathway (outboard angioplasty?) Can this old thing be saved? Do you think I might be mis-diagnosing? Any advice is appreciated.

Thanks!
Phredde
Catalina 25
San Francisco
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 03/11/2004 :  22:47:46  Show Profile  Visit Arlyn Stewart's Homepage
Water flow with mickey mouse ears and not without indicates passages ok but water pump impellers shot.
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 03/11/2004 :  23:15:31  Show Profile  Visit Leon Sisson's Homepage
Phredde,

I agree with Arlyn, water pump highly suspect.

As a trivial aside, the older OMC outboards were designed so that if the water pump impellor failed (broken rubber spider legs), the prop would continue to force cooling water through the engine at full throttle in forward. Honda B-75/B100 series were the last engines I remember seeing that feature on.

I strongly suggest that everyone should have a copy of the official manufacturer's service manual, if available, for every engine they own. Personally, I read mine cover to cover as soon as I get them, so I already have that info in my brain when the need arises.

Saltwater tends to clog cooling passages, especially the thermostat. I inspect or replace my thermostat every year or so in saltwater.

-- Leon Sisson
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 03/12/2004 :  00:32:13  Show Profile  Visit Douglas's Homepage
Salt cristals pluging the thermostat . Corrotion too . Lack of maintenance means lack of money .
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JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 03/12/2004 :  10:36:53  Show Profile  Visit JimB517's Homepage
The impeller is easy to change, you have to drop the lower end (empty the oil first). General advice is to change the thermostat any time you change the impeller. This is on top of the engine and can be done by just removing the cowl.

I doubt that your motor is damaged by the overheating. I overheated and seized my Nissan many times before I figured out what was wrong and never damaged the upper end.

I have a Clymer Nissan service manual if you would like to buy it. Covers 1992 to 2000, 2.5 to 140 HP engines.
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John V.
Admiral

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USA
559 Posts
Response Posted - 03/12/2004 :  12:36:31  Show Profile  Visit John V.'s Homepage
While we are on outboards, I'm wondering if anyone has rigged a snorkle for an outboard carb. I know Hugo Vihlen had one for the outboard on "Father's Day" but that was a very special application.

I have an old Honda 100 (9.9 hp) 1984 vintage with a 24" shaft. While in rough seas I set the OB mount on the lower setting which keeps the prop down deep but on one occaison I dunked the OB and it quit.

OK now I'm in here editing.....or......could the motor fail in a dunking because of water in the electrical system?


It took about 15 minutes of hand cranking to work the water out before it would start again and then about another 15 for it to run smooth. A snorkle would put the intake up a bit higher.

Any ideas O wise ones?

On topic...be careful when preping for winter and running the motor for a moment to clear any water. It only takes a moment to burn those plastic impeller blades. I have been taking the motor inside and putting it away in the cellar.
Edited by - John V. on 03/12/2004 12:51:11
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Maureen1000
Deckhand

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21 Posts
Response Posted - 03/12/2004 :  12:47:53  Show Profile
Here's the link to Nissan's online manuals:

http://www.nissanmarine.com/tech_talk/owners_manuals.html


Good luck.

Maureen
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 03/12/2004 :  18:54:55  Show Profile
Nissan recommends changing the waterpump impeller yearly.
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Phredde
Navigator

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125 Posts
Response Posted - 03/12/2004 :  19:46:59  Show Profile
Thanks! You guys are great as always. Will try finding and changing the impeller and thermostat. That online manual helps quite a bit, but doesn't picture the impeller unit. No worries, I'll take it apart and see what I can find.
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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.