“59 lark leaking gas

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  • dlyman9


    Replies: 8
    Topics: 1
    #267075

    Hello, I have a ’59 Lark 35hp thats leaking gas up top. It drips off the bottom zerk fitting on the shift rod going into the engine case. I’ve replaced all fuel lines. It puddles up on the motor case under the fitting then runs down and out as a frothy, watery blueish sludge. The motor sat for about 15 years until this summer. It runs like a top. I’ve had several people watch while it’s running but no one can find the source. I’m hoping someone on this site might steer me in the right direction.

    Thanks


    crosbyman

    Canada Member - 2 Years
    Replies: 2929
    Topics: 281
    #267076

    what is… ON TOP ???   fuel comes from  the fuel line obviously   then to the pump and over to the carb to be consumed

     

    have you serviced the carb after 15 years of storage ??

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    dlyman9


    Replies: 8
    Topics: 1
    #267077

    Yeah sorry that’s confusing. Should have said it is gas from the motor area and not gear lube. Have not serviced the carb because it runs so good. I laid paper rags down all around and under the carb and anywhere else I could but it seems to just drip from the fitting. The carb isn’t wet, the fuel bowl isn’t wet and neither can I find any leakage around the pump. I replaced the head gasket and pressure tested both cylinders at 108psi.


    frankr

    US Member - 1 Year
    Replies: 6364
    Topics: 50
    #267079

    So you are speaking of zerk fitting #4 in first picture?  Is it actually coming OUT of the zerk or just somewhere nearby/above?  The crankcase puddle drains #68-thru #76 drain into that general area in the exhaust housing, but I can’t say I’ve ever heard of any complaints of it coming out the zerks.

    If that’s what it is, I’d say it’s harmless, but messy.

     

    Screenshot-2022-10-04-160728

    Screenshot-2022-10-04-155446

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    frankr

    US Member - 1 Year
    Replies: 6364
    Topics: 50
    #267091

    Of course, the first thought that comes t mind is the hose #15 on the side of the powerhead.  But you said you replaced all hoses.  Say you didn’t use a vacuum hose there.  That stuff isn’t fuel-proof.


    dlyman9


    Replies: 8
    Topics: 1
    #267116

    It’s dripping off of the zerk and not out. It’s the one that points downward on the housing where the shift rod goes into the motor housing if that makes sense. I’ll try and post some pics if I can figure out how. And yes I used fuel lines for all the replacements. Thanks you guys for all your responses and help


    frankr

    US Member - 1 Year
    Replies: 6364
    Topics: 50
    #267120

    It’s dripping off of the zerk and not out. It’s the one that points downward on the housing where the shift rod goes into the motor housing if that makes sense. I’ll try and post some pics if I can figure out how. And yes I used fuel lines for all the replacements. Thanks you guys for all your responses and help

    Sorry, I can’t visualize what zerk you are speaking of.  Waiting for pictures.


    dlyman9


    Replies: 8
    Topics: 1
    #267139

    Ok, here is where it’s dripping from. Hope you can see it. The other pic is what it looks like down on the lower housing. It also has the goo coming out of the exhaust port down by the prop. It smells like gas so I don’t think it’s lower unit lube as I have replaced all the seals when I put in a new impeller

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    dave-bernard

    US Member - 2 Years
    Replies: 1907
    Topics: 29
    #267144

    unburnt fuel ?


    dlyman9


    Replies: 8
    Topics: 1
    #267151

    That’s what it looks and smells like but I can’t figure out where it’s coming from


    crosbyman

    Canada Member - 2 Years
    Replies: 2929
    Topics: 281
    #267152

    any chance the purge valve cover is loose  or leaking ?

    PH  base gasket  broken  near the purge output to the lower unit ?

     

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    • This reply was modified 1 month, 4 weeks ago by crosbyman.

    frankr

    US Member - 1 Year
    Replies: 6364
    Topics: 50
    #267156

    OK, here is what I’ve decided.  The crankcase puddle drains drain into the area marked in the picture below.  That also is the place the shift shaft passes thru.  Also, note that the shift shaft on this later model has #32 & #33 O-rings on it.  Those O-rings are not shown on the 1959 screenshot that I posted earlier.  Methinks the O-rings were added for just that reason—puddle drainage blowing out through the shift shaft bore.

     

    Bottom line is puddle drainage is normal and intentional.  And it is not harmful because it is normally headed for discharge out the underwater exhaust anyway.  Maybe a tad messy for your tastes but not much to do about it without major efforts.

     

    Screenshot-2022-10-06-104940

    • This reply was modified 1 month, 4 weeks ago by frankr.
    • This reply was modified 1 month, 4 weeks ago by frankr.
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    dlyman9


    Replies: 8
    Topics: 1
    #267727

    Thanks for all the responses guys (been away from the computer for about a week). I think I’m going to run her a little bit more and see if she “heels up” a little and go from there. I don’t have much experience with these old motors so maybe I’m trying to fix something that isn’t entirely broken. Again, thanks


    dlyman9


    Replies: 8
    Topics: 1
    #267860

    Oh and Crosbyman, where might the purge valve cover be located. Might take a look at that. Thanks


    crosbyman

    Canada Member - 2 Years
    Replies: 2929
    Topics: 281
    #267863

    see parts 68 …to      76  on the diagram above

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    • This reply was modified 1 month, 2 weeks ago by crosbyman.
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