Mercury KD4

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Viewing 15 posts - 106 through 120 (of 140 total)

  • DAN UMBARGER

    US Member - 2 Years
    Replies: 171
    Topics: 20
    #234074

    I’ve heard of guys using grease…kind of like hydraulic pressure. Haven’t tried it myself but have heard of others doing it. I guess it would depend on where the piston is in it’s travel.


    dave-bernard

    US Member - 2 Years
    Replies: 1851
    Topics: 28
    #234083

    been doing a lot of thinking. try adding the penetrating oil of choice in the cyl that covers the intake exhaust ports and add a fitting to the spark plug hole add air to say 100 lbs then you can heat if needed to push the fluid along the piston. may work I don’t know.


    green-thumbs

    US Member - 2 Years
    Replies: 522
    Topics: 41
    #234093

    Nuts, washers and threaded rod
    Grease gun
    Louis


    Boonie

    Canada Member - 2 Years
    Replies: 164
    Topics: 21
    #234104

    Wow , lots of good ideas. I’ll try some and post my results. Thanks guys. FYI I tried air pressure to take dents out of a TD20 gas tank. Worked great untill I tried just a little more. Tank ended up looking like a football!
    Oh well live and learn.


    Boonie

    Canada Member - 2 Years
    Replies: 164
    Topics: 21
    #235731

    One down. One to go!


    opposedtwin

    US Member - 2 Years
    Replies: 919
    Topics: 251
    #235744

    So it looks like you had enough play/room to get 2 nuts and a washer between the cylinder and the case? Or did get that one off using another technique?

    • This reply was modified 1 year, 4 months ago by opposedtwin.

    Boonie

    Canada Member - 2 Years
    Replies: 164
    Topics: 21
    #235797

    Well I had to throw everything at this one. First I filled the cylinders up with WD40 for a couple days. Nothing moving. Soaked for another week. Nothing. Then I tried liquid wrench for a couple days. Nothing. Then I tried some evapo rust. That stuff does a number on rust but still no movement. So I took it to work and preheated the oven to 350 degrees and put the power head in for about a half hour, then moved it to our walk in freezer. Then soaked it overnight in WD40. Next day put the flywheel on and using a strap I had a friend put as much pressure on it as possible. I took a wooden dowel and put it in the spark plug hole and with some heat gave it a whack. Pop, the top piston came free. Have been soaking the bottom piston and tomorrow will try the heat , freeze method again


    opposedtwin

    US Member - 2 Years
    Replies: 919
    Topics: 251
    #235874

    Nice!! Thanks for sharing! Have always been curious about the oven method. Next time my wife’s out of town I may give it a try!
    Scott


    jeff-register


    Replies: 1281
    Topics: 49
    #235897

    Go to M.G. Chemicals & buy “Super corona dope” It is a very high voltage liquid insulating covering. If you want to stabalize the coil use fibergalss cloth, the very thin cloth used for radio controled toy airplanes from a hobby shop. cut to size & saturate the cloth using corona dope. It looks like clear fingernail polish.


    Boonie

    Canada Member - 2 Years
    Replies: 164
    Topics: 21
    #236030

    Hallelujah. Free at last. I learned one thing for sure. I have more patience than my wife says I have!


    Boonie

    Canada Member - 2 Years
    Replies: 164
    Topics: 21
    #236032

    One question I have. Do I have to remove the crankshaft to replace the seal on the flywheel end? Bottom end has a cap that comes off.


    opposedtwin

    US Member - 2 Years
    Replies: 919
    Topics: 251
    #236122

    I beieve you do. Kirk p has a thread in the “projects column” where he discusses these seals. I believe it’s entitled “WB3”.

    WB3

    • This reply was modified 1 year, 4 months ago by opposedtwin.

    green-thumbs

    US Member - 2 Years
    Replies: 522
    Topics: 41
    #236163

    Several things I would want to know if it was on my agenda.
    1) are rods rusted to crankshaft
    2) are both pistons stuck
    3) signs of prior attempts to unstick

    I have had good results with Marvel Mystery Oil on very lightly stuck
    powerhed. If both pistons are stuck and or rod bearings rusted to
    crankshaft. freeing up and disassemby may be difficult,

    I would apply oil thru spark plug opening, exhaust ports and thru crankcase opeing to cylinders. The stuff oiled paper in thru spark plug opening to reduce volume of grease required. Next attach grease gun to spark plug adapter and attempt to free piston that is hight in cylinder,
    Do not overdo it! Exhaust ports can be blanked off to seal grease in
    If you can move piston down far enough to gain work space between
    cylinder and crankcase for nuts and threade rods you can pull the
    piston completely clear of cylinder. The piston often will require this
    to mover it the last inch or two our to cylinder.
    Both grease gun and nuts, washers and threaded rods are powerful
    tools that will free up most stuck pistons and ALSO break things if nothing wants to give.

    I once pickup up a stuck KE4 powerhead that someone had tried to freeup with a pipe wrench. Did not work and lefte deep indentations
    on crankshaft taper. It responded to greasegun methods with very
    little pressure. needed.

    Sometimes you can remove unstuck cylinder and piston & rod assembly and gain enough space between the stuck cylinder and crankcase
    to use nuts, washers threaded rods to pull the piston out. Depends
    on where piston is in the cylinder.
    If low a go, If high grease gun.
    Louis


    Boonie

    Canada Member - 2 Years
    Replies: 164
    Topics: 21
    #236189

    Ok so pistons are free, next step is to free up the rings. Is it possible to buy new pistons and rings? Also I need new seals for both ends of the crank.


    Boonie

    Canada Member - 2 Years
    Replies: 164
    Topics: 21
    #236217

    Does anyone know how to remove the crankshaft from this Kd4?

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