Re: 54Evinrude Big Twin crankcase

[ADAM GIBB]

quote Chris_P:

There should not be an o ring on the top bearing for that model. Many times, one gets installed when they are opened up.

I can see where this confusion comes from. By 1962 the o-ring on the top bearing was required, so anyone that had been trained to work on 60’s motors would likely have added that o-ring when opening up the older motors.

If you have 95 lbs compression and the scratches in the bore don’t feel to deep,you may want to run it as is, depending on how many hours it will see.

I have a 1955 Johnson that left the factory without a retaining clip on the bottom, of the bottom wrist pin. There was a groove cut half way through the cylinder sleeve, but the motor still ran, although poor idle have away the difference in the two cylinders.