Backfire/misfire thru carb

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  • Beno


    Replies: 78
    Topics: 26
    #213285

    I also just realized that my 115hp bubbleback had those vents you mentioned at the top of the cylinder water jackets. This 140hp does not have them. Clearly the engine was designed to work without them.. should i drill and 1/8th inch tap them in or just let it go? My other boat is a 120hp straight4 mercury inboatd jetboat it has this style hole in its chrysler force block but its plugged off.


    fleetwin

    US Member - 2 Years
    Replies: 4075
    Topics: 41
    #213344

    OK, sounds like that mystery is solved…I would have to look at it closely but I think it makes sense. Water exits powerhead adapter through that hose you had blocked off, then off to cool the exhaust elbow…
    I see that the heads to this unit are vented, tied together, then exit through the elbow/muffler as well…
    http://epc.brp.com/Index.aspx?lang=E&s1=a6780bbe-a9cf-4155-8013-c15af250e35b


    Beno


    Replies: 78
    Topics: 26
    #213573

    anyone happen to know the correct torque for the bolts to bolt this 140hp at the base?
    the bolts are 1/2″ hex drive and the shank of the bolts seem to be 3/8″ i believe.


    Beno


    Replies: 78
    Topics: 26
    #213579

    reassembly

    IMG_20200905_175028

    IMG_20200905_183158

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    Beno


    Replies: 78
    Topics: 26
    #213587

    back in she goes

    IMG_20200905_190534

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    IMG_20200905_190552

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    Beno


    Replies: 78
    Topics: 26
    #213593

    IMG_20200905_194306

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    IMG_20200905_200559

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    fleetwin

    US Member - 2 Years
    Replies: 4075
    Topics: 41
    #213598

    Making great progress


    Beno


    Replies: 78
    Topics: 26
    #213603

    IMG_20200905_212436

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    IMG_20200905_213807

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    Beno


    Replies: 78
    Topics: 26
    #213608

    IMG_20200905_213809

    IMG_20200905_213811

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    Beno


    Replies: 78
    Topics: 26
    #213612

    ok, I found a flywheel puller and popped the flywheel… looked nice inside, there were 4 flat head screws and keepers, I had to re-bend each keeper to stop them from grabbing onto the trigger so hard… was odd. all 4 were wrong? noone noticed before now that the trigger couldn’t move but me?

    the flywheel nut is bigger than 1 1/4″ whats the correct socket (im making due with a strange grey 36mm I have now but its touch n go)

    and the big question.. whats the correct torque for the flywheel nut?


    fleetwin

    US Member - 2 Years
    Replies: 4075
    Topics: 41
    #213618

    OK, well I’m not sure what picture I missed…But, that upper main is not installed with its proper hardware… I see one of the sensor coil plastic bushing clamps (upper right) clamped down improperly and facing in the wrong direction… There is supposed to be four clamps, four smaller machine screws that thread into the upper bearing. Needless to say, the clamps point in towards the crankshaft. The clamps will usually keep the plastic bushing from rotating in the upper bearing, this is normal . The sensor coil assembly spins inside the plastic bushing. The OMC moly lube is used to lubricate the brass/bronze pilot bushing inside the sensor assembly. Use regular outboard oil to lubricate the plastic bushing. The correct flywheel nut torque is: 105 ft. pounds.
    No comment on the home made puller rig, will just say don’t get hurt. You will need a heavy ring gear holder to torque the flywheel…
    http://epc.brp.com/Index.aspx?lang=E&s1=6799ea59-4d96-43e7-88b6-fa36e884bdd6 This is the link to the BRP parts look up, you can find the turbo jet break down in here…


    Beno


    Replies: 78
    Topics: 26
    #213647

    Sorry I missed taking a pic of the flanges as I found them, all four were mounted correctly, Just too tight, had to modify all 4.. strange.
    in the pic you saw I had already removed 3 flanges and one in the upper right I had just turned around.

    I was able to hold the flywheel with 4 pair of vise grips strategically located, I guessed and torqued the flywheel to 140lbs (35 over).. seems to be ok for now tho.

    That sanford n son Flywheel puller has come thru in the past, I keep it way in the back of the tool cabinet in a box labeled “stale crackers” and never admit ownership to anyone.

    I had to pull the flywheel twice tho, after reading online that the flywheel and crack mating-surfaces had to be immaculately clean, and I had reassembled mine with oil everywhere. pulled and cleaned, then torqued.

    next step is the fuel tank, replace fuel line, canvas hatch cover and seats!


    Beno


    Replies: 78
    Topics: 26
    #213682

    hooked up the garden hose water. engine runs cool. isnt’ happy about running till it gets warm… does little kickbacks.

    Canvas started and finished in one night..


    Beno


    Replies: 78
    Topics: 26
    #213683

    IMG_20200906_182143

    IMG_20200906_182148

    IMG_20200906_195341

    IMG_20200906_202746

    This is what happens when you use regular wood in a marine environment.

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    Beno


    Replies: 78
    Topics: 26
    #213690

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