OMC Carburetor

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  • labrador-guy

    US Member - 2 Years
    Replies: 688
    Topics: 50
    #244087

    I found this carburetor at a rummage sale it was missing a few parts. I have a parts list for the 1951/52 25hp OMC which I thought this carb was so, I ordered a new needle and plug. WRONG! I have no treads to screw the slow speed needle into. Anybody recognize this carb? Also a parts list so I can find the right parts to get this puppy working again?

    dale

    get’em wet!… don’t let’em set!

    Wrong needle and plug!


    seakaye12

    US Member - 2 Years
    Replies: 820
    Topics: 101
    #244090

    That might be a different model carburetor which uses a bushing that slides in the carburetor body and accepts the threaded needle valve. The bushing has the needed internal threads and is held in place by the compression of the packing washers as the needle retaining nut is snugged down.

    Might not fit your 1952 though.

    You can see the bushing #34 on this parts diagram:

    https://www.boats.net/catalog/evinrude/outboard-by-hp/18hp/18802a-1968/carburetor-group

    • This reply was modified 11 months, 1 week ago by seakaye12.

    frankr

    US Member - 1 Year
    Replies: 6181
    Topics: 49
    #244092

    No guarantees, but I’d say a 1955 RD-17. You are missing the #58 threaded sleeve.

    10.-Carburetor-and-Intake-Manifold


    labrador-guy

    US Member - 2 Years
    Replies: 688
    Topics: 50
    #244095

    WOW! I wish I would have left it set! That #58 would have to be in the housing about 2 1/5″! The plug screws in at the very front of the carb. Looks to be about3/8″. Maybe a spacer between the packing and the needle sleeve? I just don’t understand!!

    thanks dale


    fleetwin

    US Member - 2 Years
    Replies: 4246
    Topics: 42
    #244097

    WOW! I wish I would have left it set! That #58 would have to be in the housing about 2 1/5″! The plug screws in at the very front of the carb. Looks to be about3/8″. Maybe a spacer between the packing and the needle sleeve? I just don’t understand!!

    thanks dale

    I’m confused about what you are concerned about….Are you concerned that the threaded sleeve isn’t long enough? Are you making this judgement just by the picture?


    frankr

    US Member - 1 Year
    Replies: 6181
    Topics: 49
    #244104

    Pre-assemble 58, 59, and 60 onto the needle valve, threading 58 on a few turns. Then push the whole sub-assembly into the carb and tighten the packing nut enough to keep the threaded sleeve from spinning. Then screw the needle in till lightly seated and back it out 1-1/2 turns. Finish up by tightening the packing nut for desired friction after final adjustment of the needle at idle.


    labrador-guy

    US Member - 2 Years
    Replies: 688
    Topics: 50
    #244108

    I gotta find those parts 58 60 and 64 because mine were gone!
    Maybe ede will have them gonna check.

    dale


    Mumbles

    Canada Member - 2 Years
    Replies: 5507
    Topics: 292
    #244141

    Here’s what the pieces you need look like. The sleeve would be easy enough to make if you have access to a lathe and a 1/4 X 40 tap. Concave side faces the packing washers.

    EDIT: That would be concave, not convex.

    DSC00943

    • This reply was modified 11 months, 1 week ago by Mumbles.
    • This reply was modified 11 months ago by Mumbles.
    • This reply was modified 11 months ago by Mumbles.

    labrador-guy

    US Member - 2 Years
    Replies: 688
    Topics: 50
    #244195

    Here’s what the pieces you need look like. The sleeve would be easy enough to make if you have access to a lathe and a 1/4 X 40 tap. Concave side faces the packing washers.

    EDIT: That would be concave, not convex.

    DSC00943

    • This reply was modified 11 months, 1 week ago by Mumbles.
    • This reply was modified 11 months ago by Mumbles.
    • This reply was modified 11 months ago by Mumbles.

    Mumbles would you have the part numbers for the components in your picture? I have no machining abilities and not many part numbers from pre ’56 motors. I went to Gary’s share site and could not find these particular pieces.

    thanks dale


    outbdnut2

    US Member - 2 Years
    Replies: 1663
    Topics: 83
    #244206

    I worked on a 1961 10 HP recently where I couldn’t get that #58 to stop turning when inserted into the carb, so I couldn’t screw in the needle. Part 60 pushing the packing against part 58 would not hold it. I dried everything out with Q-tips and put a coating of a very thin locktite sealer on the outside of #58 and inserted it all the way in. After letting it sit overnight to cure, everything works fine. I just hope I never have to take #58 out because breaking loose the Locktite may be hard to do. This is only one carb out of dozens I’ve worked on that gave me this problem.
    Dave

    • This reply was modified 11 months ago by outbdnut2.

    Mumbles

    Canada Member - 2 Years
    Replies: 5507
    Topics: 292
    #244225

    Dale: The P/N for the small sleeve, #58, is 303939 and was used in many 10 horse and up motors over the years.

    Has the year and horsepower of the carb been confirmed yet as different needles, #64 and gland nuts, #60 were used to.

    I’ll dig around in my files when I get home later today to see what I can find.


    labrador-guy

    US Member - 2 Years
    Replies: 688
    Topics: 50
    #244246

    Dale: The P/N for the small sleeve, #58, is 303939 and was used in many 10 horse and up motors over the years.

    Has the year and horsepower of the carb been confirmed yet as different needles, #64 and gland nuts, #60 were used to.

    I’ll dig around in my files when I get home later today to see what I can find.

    No we have not determined the year for sure of the carb. Franks best guess was 1955 25hp that sounds right to me. The sediment bowl is on the side of the carb and it looked like my 51/52 parts list that I have. For sure it is not 51/52 ’cause I ordered some parts and they were wrong. Maybe they can be made to work but that needs to be determined. Like I said in the beginning I picked it up at a yard sale and I knew it was missing parts. I never realized that those treads for the needle were replaceable. I have had lots of those carbs apart. Live and learn I guess!

    dale

    Once an old poet told me, “what ye pound in,,,ye must pound out”!


    Marc Beaudry


    Replies: 2
    Topics: 1
    #247074

    so – my 1952 Rude 25hp – uses THAT carb – just like in the photo , i’m not saying my carb is original to my motor however but can confirm that parts are all fitting as intended…


    Shamus


    Replies: 35
    Topics: 4
    #252419

    Anyone know the ID and OD of the packing washers?

    I’ve got to replace mine.

    John


    labrador-guy

    US Member - 2 Years
    Replies: 688
    Topics: 50
    #252458

    Anyone know the ID and OD of the packing washers?

    I’ve got to replace mine.

    John

    John, the packing washers are 1/4″id 3/8″od. I make my own from different gasket paper and once in a while from leather pieces. I have been told that Ace hardware has them but I don’t know that for sure. Some people say they use O rings. I have not had any luck with those. You need a washer that will hold the needle in position, sometimes vibration will unscrew the needle and performance will go away quickly. They also need to seal up so they don’t leak fuel or air.

    dale

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