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TOPIC: 1959 Mark 55A Disassembly

1959 Mark 55A Disassembly 2 months 1 week ago #134388

Regards. I am new to Mercury's but reasonably handy with Johnyrudes...
Starting a minor disassemble a Mark 55 for cleaning. Is it easier to disconnect the choke solenoid power source and leave it attached to the top engine cover? these Mercs seem "tight" to work on...

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1959 Mark 55A Disassembly 2 months 1 week ago #134389

they have either a eye bolted or a knife connect under a rubber most likely. leave the solenoid and don't forget the ground wire.

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1959 Mark 55A Disassembly 2 months 1 week ago #134392

Thanks. I assumed there might be a way to disconnect under the rubber sleeve. The ground is attached at the solenoid mount but broken free on the other end...

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1959 Mark 55A Disassembly 2 months 1 week ago #134395

the broken end attaches to the bolt that hold the mag adjustment plate on. must be grounded to work the choke.

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1959 Mark 55A Disassembly 2 months 1 week ago #134410

I managed to disassemble and repair the recoil and clean everything up. The lower unit drain plug is missing so it has been without gear oil for a while. I pulled the lower unit and inspected the impeller - will change it before I run it. While cleaning it the shift cams came off and hadn't marked their orientation. So... my next question is - do the shift cams need to be aligned a specific way on the shaft? The engine was in neutral.

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1959 Mark 55A Disassembly 2 months 1 week ago #134411

Figured it out... Put the top cam in the housing with a bit of grease and the engine tipped up horizontal. Then slid on the lower unit. I was careful to line up the water tube and it slid together nicely. Shifts into forward neutral and reverse now.

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1959 Mark 55A Disassembly 2 months 1 week ago #134414

Yes but does the reverse locks work right. that is what the shift cams do.

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1959 Mark 55A Disassembly 2 months 1 week ago #134416

Humph. Not sure. Prop spins freely both ways in neutral, neither way in forward, and will click as turning clockwise in reverse...

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1959 Mark 55A Disassembly 2 months 1 week ago #134420

when you tilt the motor down do the hooks go over the tilt pin? and when you put it in neutral do they stay engaged?

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1959 Mark 55A Disassembly 2 months 1 week ago #134429

They seem engaged in forward and not in reverse. So that would not be right...

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1959 Mark 55A Disassembly 2 months 1 week ago #134430

correct. the shaft is right but the lower cam is on the shaft wrong.

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1959 Mark 55A Disassembly 2 months 1 week ago #134431

Okay. Can you explain how the lower cam can be correctly aligned?

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1959 Mark 55A Disassembly 2 months 6 days ago #134445

1 914 310 7086 call me.

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1959 Mark 55A Disassembly 2 months 6 days ago #134448

Roger. I am in the mountain time zone so it is a bit late out east. I am off work friday so will call in the morning.
Thanks

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1959 Mark 55A Disassembly 2 months 6 days ago #134450

10-4

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