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Jeff G.
Jeff G., Marine Mechanic
Category: Boat
Satisfied Customers: 4728
Experience:  42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance
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I am replacing a lower unit on an old Merc1000 1969. It is a

Customer Question

I am replacing a lower unit on an old Merc1000 1969.
It is a Cam Shift Type 1.
How do I index the shift shaft to the lower unit to the shift shaft?
And the revere cam lock that also has to be aligned.
There has to be a protocol to get this right.
Please advise
Submitted: 2 years ago.
Category: Boat
Expert:  Jeff G. replied 2 years ago.

Can you get me the serial number of the engine?

Customer: replied 2 years ago.
1969 Merc 1000 6 cylinder
Expert:  Jeff G. replied 2 years ago.

Put the control in reverse. Put the lower unit in reverse. The reverse lock cam will push up on the shaft from the reverse lock. This causes the hooks further up on the midsection to go over and lock down on the tilt pin. So in reverse you want the high point of the cam forward. Does this make sense to you?

Customer: replied 2 years ago.
Yup that makes sense. My main question was how to index the shift shaft.
As it turns out, I was not putting enough effort in to the shaft,
and when I did I could feel the detente spring and could shift in to F, N & R.
I put the reverse cam lock in as you said.
I did a wet test in the drive shifted fine, then to the water, and all is good.
Thanks again
ps 1964 Cruisers, Inc #1722 with the Merc1000 1969
Expert:  Jeff G. replied 2 years ago.

Glad to help. Love the old motors. Please don't forget to rate my service.