1956 Evinrude 15hp Throttle Q and Fouling

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  • andreaskc


    Replies: 5
    Topics: 1
    #239940

    Yes, both coils look pretty new and identical. Almost all the wiring inside looks new… except the one fabric covered wire from one of the coils.

    The spark plug wires do “look” oldish…. whatever that means… they have a bunch of nicks on them, no real writing of any kind, and oxidized. I tend to not want to replace something especially if expect it to be working…. I don’t know that I want to just go replacing coils/condensers/etc given that they all look new and don’t know they are actually broke…. althou maybe the plug wires and one coil wire that look 60 years old are due for updating?

    No I don’t have an OMC specific flywheel puller, thought I could retrofit one of my pullers to bolt into the three bolts and pull against the center flywheel bolt…. the “old outboard” book I have talks about pulling up on the flywheel with hand while tapping on center puller applying some pressure on it. Book has some OMC/Evinrude service bulletins in it with 60s style helpful pictures along with tips on handling the flywheel key on reinstall.

    On the throttle cam, the way you explained it is what I now understand, there were some early comments I saw about it having to do something with where “start” is on the handle. Sounds like it currently is running a bit rich off idle, not by much but is some. I can see that the butterfly shaft does start turning before the mark bisects the roller.

    Hard to get good pictures of some of the dark areas with the phone… the bite out of the spark plug wire does look pretty decent where it rubs and yes it looks difficult to prevent it from rubbing… there doesn’t seem to be much clearance where it needs to come out of the plate at an angle and make the turn going down at WOT. The little plastic wire covers crosbyman has in his attachments look pretty effective thou?

    In other thoughts, checking the bleeder looks like I need to pull the entire carb off…there a gasket around this that will need replacing or carefully pulling can be reused? I suspicion looking at this….


    crosbyman

    Canada Member - 2 Years
    Replies: 2121
    Topics: 227
    #239941

    CAREFULlY pop the carb back plate…I have never broken a gasket yet and I reused all of them

    careful not do damage the reeds on the purge valve !!

    as to condensers … very basic tests (ohms and capacitance kicks) can prove them bad but basic tests can never simulate life high voltage operation only a condenser tester can do that.

    in other words you can test for bad ones but you can’t fully test for good ones with just a VOM

    see parts 1-4 on condensers…

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    • This reply was modified 3 days, 23 hours ago by crosbyman.
    • This reply was modified 3 days, 23 hours ago by crosbyman.
    • This reply was modified 3 days, 23 hours ago by crosbyman.

    fleetwin

    US Member - 2 Years
    Replies: 3829
    Topics: 39
    #239947

    OK, well if both the coils look new, I don’t know what the fabric covered wire could be…Newer coils do not use fabric covered wires…Does this engine have some sort of external stop/safety switch added, perhaps that is the fabric covered wire… You can try using a generic puller with the three bolts going into the flywheel holes…Perhaps the flywheel won’t put up a fight and pop off….But, if it doesn’t want to give up/come off easily, don’t keep wrestling with the generic set up…The bolts will probably snap off and you could get hurt. Sometimes using an impact gun on the center puller bolt helps pop the flywheel off…But again, I wouldn’t go digging into the ignition system until you confirm you have an actual ignition issue. Ripping things apart like this usually ends up adding to confusion and possibly creates new problems…Save the ignition overhaul for winter work unless you confirm there is an ignition issue now. .
    Again, the roller might start to turn before the mark bisects the roller, but that does not mean the throttle shaft is actually starting to move/open…There is a lot of slop in that linkage. So, seeing the roller start to turn slightly before the cam bisects the roller sounds correct….Watch the actual throttle shaft and see when it actually starts to move, I’m betting it is fairly close to being correctly set…In any event, even if the adjustment is off a bit, this not going to make the plugs foul. And again, if the carb butterfly is opening too early, this usually has the effect of “lean off idle”, not rich….I know this seems counter intuitive, but is true…But, it is important to note that the carb butterfly must be completely closed at idle speed.


    crosbyman

    Canada Member - 2 Years
    Replies: 2121
    Topics: 227
    #239958

    the closed carb butterfly concentrates the crankcase vacum pull on the carb idle circuit located on top where fuel drops down 3 VERY small holes. They must be clean and the only way to clean the idle circuit properly is to remove the top plug, clean the chamber and reinstall a new plug .

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