Reply To: Shaking at High RPM Running 1955 Evinrude Fleetwin Aquasonic 7.5HP

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October 11, 2019 at 11:45 am #185020
Don
Participant

    US Member

    OK, well both of those upper driveshaft seal housings look like the lower driveshaft/shock unit was rubbing on them….Once the shock expands, the length of the driveshaft increases so it rubs on this housing. This is wear the binding occurs causing the engine to labor/stall, especially at higher speeds under more load…
    So, the question is where did these two housings come from? Did you disassemble the original gearcase? If so, have you measured the length of the lower driveshaft/shock unit?