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Catalina/Capri 25/250 Sailor's Forums

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9.8 hp Nissan/Tohatsu outboard

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dmpilc
Master Marine Consultant

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USA
4593 Posts

Initially Posted - 07/25/2011 : 15:28:49

I'm faced with a dilemma. Seafoam did not clear my slow idle jet after all, and I need to pull the carb from the engine in order to clear the jet or replace it. I have a replacement but no easy way to pull the boat, and changing gears while idled up can't be good for the motor.
This means I need to pull the carb with the boat in the water. Has anyone out there with this motor done it while still in the water? Our harbor manager/motor fixer says the connectors (hoses, throttle connection, etc.) disconnect easily and there are only 2 screws to loosen. I'm still concerned about dropping something critical overboard. Your thoughts?

DavidP
1975 C-22 SK #5459 "Shadowfax" Fleet 52
PO of 1984 C-25 SK/TR #4142 "Recess"
Percy Priest Yacht Club, Hamilton Creek Marina, Nashville, TN

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Stinkpotter
Master Marine Consultant

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Djibouti
9081 Posts

Response Posted - 07/25/2011 : 15:43:18

When I was working on my Honda on the boat, I used the same technique that's been described for winch maintenance--I removed the upper part of the cowl and cut a hole in a large box so it fit over the engine and sat on the lower part of the cowl, and secured it with some tape. I can't say exactly how that would work on the Nissan/Tohatsu...

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John Russell
Master Marine Consultant

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USA
3444 Posts

Response Posted - 07/25/2011 : 15:47:42

I saw somebody do the same repair to his and he had an inflatable kid's pool under the motor while doing the work. He tilted up the motor and positioned the pool then lowered the motor back down.

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 07/25/2011 : 15:59:44

I've removed my Merc carb a couple of times while it was mounted on the boat without issue. I plugged the holes beneath the powerhead just in case I dropped something within the outboard and taped a white towel between the transom and the outboard to catch stuff when bringing parts into the boat. After removing the entire carb, I disassembled it on one of the marina picnic tables using a pizza box to catch the tiny springs and ball bearings.

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Davy J
Master Marine Consultant

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USA
1511 Posts

Response Posted - 07/25/2011 : 17:12:53

I've pulled the carb twice on my Tohatsu while the boat was in the water. As I stated before, there are two bolts holding the carb, airbox and the seals. The most difficult thing to get at, while the motor is mounted on the boat, is the fuel line. It is located behind the carb and difficult to see while leaning out over the stern. One possibility, borrow a dinghy and stand in it to remove the carb. With the dinghy situated under the motor. That way, if you happen to drop anything, it would hopefully end up in the dinghy.

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jaclasch
Navigator

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USA
104 Posts

Response Posted - 07/25/2011 : 17:43:30

I had a similar problem. Seafoam did not seem to be working. The marina has a very good carb mechanic and he showed me how you could just pull the stern/motor close to the end of the slip and work from there. He stuffed a bunch of paper towels under the carb and then removed the drain plug letting the towels soak up the small amount of gas that drains out. After replacing the plug and starting the engine, it ran but still had a rough idle. After a few minutes, however, it smoothed out and has not even coughed since.

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calden
Navigator

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USA
194 Posts

Response Posted - 07/25/2011 : 21:15:46

I just replaced the standing rigging and masthead sheaves for new halyards. I dropped the mast and had the masthead sticking out over the stern pulpit, then backed up to the dock. I duct-taped a small tarp to the pulpit under the masthead and the other end to the dock cart, forming a neat little catch-all under the whole shebang. Saved my bacon. Be careful to tie the boat up snugly, too.

Carlos

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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts

Response Posted - 07/25/2011 : 23:10:33

Sounds like lots of good ideas to choose from. I can verify it's only two bolts, 10mm I'm pretty sure, and you'll need an extension to get to the back one. The point about the fuel line is well taken, it's tucked up underneath the body and a bit hard to get to, but not horrible. Definitely have some sort of catcher mechanism in place so Neptune doesn't claim some bits. A supply of compressed air will be handy once you have it apart. Mine ran rough for a short time after I put it back together, but now it idles right down to nothing just like when it was new. I still plan to run a can of Sea Foam through it, but for now it's running reliably.

Good luck and let us know how it goes and what solutions you come up with.

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jaclasch
Navigator

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USA
104 Posts

Response Posted - 07/26/2011 : 10:10:46

By the way, I have talked to several people at the marina that have switched to ethanol-free gas, available at two Conoco stations I know of. They report longer gas life and fewer problems with outboard carburetors. There was just an article in the paper about the nation-wide increase in stations that sell ethanol-free gasoline. I have not tried it yet.

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dmpilc
Master Marine Consultant

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USA
4593 Posts

Response Posted - 07/26/2011 : 20:43:55

I went out there this morning, with tools, intending to pull the carb with the motor on the boat. By the time I got there, I had decided it was a stupid risk and if I dropped anything overboard I would be so mad at myself. So, I wimped out, turned the boat around so it was stern first in the slip, and pulled the motor. However, that was not before I realized I didn't have the key to the padlock - different key ring. So, I drove home, about 29 miles each way, got the key and my 5 hp long shaft 4 stroke Merc o/b and went back to the lake. I almost went into the water trying to get the alt cables out through the very small hole in the transom, got the motor off of the boat and put the 5 hp Merc in it's place as a temporary substitute. The Merc started right up. On the lowest motor mount setting, the cavitation plate is just barely in the water, but it's good enough for our Learners program this evening - I'm an instructor.
We got in a nice sail in a mild wind, perfect for teaching. And my 9.8 Nissan is safely in the dock manager's office/work area for the carb takedown.
Thanks anyway for all of the tips, maybe next time, if there is one, I'll try it meself. BTW, the most difficult part was carting it up to the marina building after getting it off of the boat. To lift it up, I made a sling out of a 3/8" piece of rope about 24 ft. long. with the boat backed in and the motor right next to the dock, it was a simple lift and pull drill. however, I'm sure my arm muscles will remind me tomorrow morning of the abuse I put them through. It's not very often that I have to vertically lift 93 lbs.

Edited by - dmpilc on 07/26/2011 20:48:41

calden
Navigator

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USA
194 Posts

Response Posted - 07/27/2011 : 08:26:41

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by jaclasch
 By the way, I have talked to several people at the marina that have switched to ethanol-free gas, available at two Conoco stations I know of. They report longer gas life and fewer problems with outboard carburetors. There was just an article in the paper about the nation-wide increase in stations that sell ethanol-free gasoline. I have not tried it yet.
<hr height="1" noshade id="quote"></blockquote id="quote">

Sorry if this has been posted before... A nationwide list of ethanol-free gas stations...
http://pure-gas.org/

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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.