1958 35 HP Big Twin

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  • terry wier

    US Member - 1 Year
    Replies: 5
    Topics: 2
    #246822

    Help!

    IMG_0100

    After five years I finished my boat but have yet to have a relaxed ride (9 tows and counting). The Big Twin has had all the parts replaced, starts, and runs like a top. But….
    Either the low or the high speed needle valve always turns out after a while, it kills, usually fouls the plugs, and won’t start. I have put three packing washers on each needle (several do overs on each) and tightened the gland nut so I can barely twist the needle. One of them will still come loose within 20 minutes. Any ideas??? Duct tape the knobs?

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    fleetwin

    US Member - 2 Years
    Replies: 4062
    Topics: 41
    #246828

    Well, this is peculiar… Does the gland nut loosen up allowing to needle to move about? Or, does the needle just get loose in the packing washers? Once the needle gets loose, can it be retightened by tightening the packing/gland nut again? Something isn’t right here for sure. The only other thing I can think of is excessive vibration, but it seems like other parts would be falling off as well before there is enough vibration to move those needles.
    Does this issue occur on both high and low speed needles? For some reason is the packing nut bottoming out in the carb body before actually compressing the packing washers? You should be able to snug that packing nut down enough so you can’t even move the needles by hand…Are you using OEM packing washers along with the clear plastic washer that comes in the new carb kits?


    terry wier

    US Member - 1 Year
    Replies: 5
    Topics: 2
    #246829

    Both high and low have come out multiple times. The gland nut comes out with the needle. I can tighten the gland night so the needle will not turn. I don’t think the packing is OEM. Once they come out I thread the needle and the gland nut both back in. Is the order of the low speed going into the carb: aluminum bushing (bevel side out) packing, nylon washer? Is the order for the high speed: packing, nylon washer ?

    • This reply was modified 1 month ago by terry wier.

    need2fish

    US Member - 2 Years
    Replies: 224
    Topics: 13
    #246844

    I’d put in fresh fresh packing. I buy mine at Napa.

    I’m pretty sure there is no nylon washer. I removed the high speed needle on my ’60 RD-22 (40hp) this morning and verified it has packing only. Check the diagram on Marineengine.com. It shows the packing and nothing else. However their part # is bogus therefore you may not be able to source it from them.

    How ’bout some anti-seize compound on the packing nut threads ?


    olcah

    US Member - 1 Year
    Replies: 456
    Topics: 78
    #246845

    Put in more packing washers. Maybe your packing gland is tightened metal to metal.


    terry wier

    US Member - 1 Year
    Replies: 5
    Topics: 2
    #246846

    On my way to Napa. It seems anti-seize is a lubricant and would make the needles loosen easier?
    Thanks for the help.


    Shear Pin

    US Member - 1 Year
    Replies: 12
    Topics: 0
    #246847

    Very nice.


    need2fish

    US Member - 2 Years
    Replies: 224
    Topics: 13
    #246886

    Duh — my mistake — running on one cylinder this morning. 🙁

    I meant Loctite or similar.


    fleetwin

    US Member - 2 Years
    Replies: 4062
    Topics: 41
    #246907

    OK, so you are saying the packing nut comes loose on both needles allowing the needles to drift, correct? I would use the OEM components, install two packing washers, then position the clear plastic spacer (included with latest OEM kits) in between the fiber packing washers and the packing gland nuts.
    Are the threads clean on the packing nuts and in the carb bodies? I guess I would pull out all the packing components/needles, then thread the packing gland nuts in and out the carb bodies to make sure the threads are OK….Make sure the packing nuts are not “bottoming” in the carb bodies before actually crushing/tightening the packing washers. Use three fiber packing washers if necessary….D


    terry wier

    US Member - 1 Year
    Replies: 5
    Topics: 2
    #247092

    fleetwin,

    yes that is the plan. I just got more new packing washers. In the meantime the lower unit is leaking oil all over the place after expert A flipped the dog clutch. That solved the jumping out of gear But he did not put in new seals like I asked him to. Why?? Don’t know. I’m taking it to expert B and bagging it for the season.

    • This reply was modified 4 weeks, 1 day ago by terry wier.

    fleetwin

    US Member - 2 Years
    Replies: 4062
    Topics: 41
    #247099

    Oh boy, so sorry about the gearcase…. I laugh when guys say those clam shell gearcases are easy to seal up….Wrong…. Takes careful work, and a pressure tester…. Don’t run the engine with water in the gearcase, call it quits for the season….D


    outbdnut2

    US Member - 2 Years
    Replies: 1618
    Topics: 83
    #247105

    I agree with Fleetwin – When I have to seal up those gearcases, I make sure I have several hours set aside to carefully get everything right…..and I keep telling myself that some day I’ll build a pressure tester.
    Dave


    crosbyman

    Canada Member - 2 Years
    Replies: 2264
    Topics: 236
    #247296

    no need ti build one… 🙂 this one worked for me on my 75 ETEC and….you can test vacum leaks and pressure on the gear case. just install a hose line and gearcase adapter/nipple

    Joining AOMCI has priviledges 🙂


    outbdnut2

    US Member - 2 Years
    Replies: 1618
    Topics: 83
    #247322

    no need ti build one… 🙂 this one worked for me on my 75 ETEC and….you can test vacum leaks and pressure on the gear case. just install a hose line and gearcase adapter/nipple

    No picture came through, and clicking on free preview didn’t work either. Do I have to belong to Kindle to see it?
    Dave

    • This reply was modified 3 weeks, 5 days ago by outbdnut2.

    crosbyman

    Canada Member - 2 Years
    Replies: 2264
    Topics: 236
    #247330

    try this

    wait after the useless commercial….if any $45 CDN on Amazon … likeley cheaper US side one is unavailable but search Amazon for other suppliers

    Joining AOMCI has priviledges 🙂

    • This reply was modified 3 weeks, 4 days ago by crosbyman.
    • This reply was modified 3 weeks, 4 days ago by crosbyman.
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