How do you tell one omc lower from another?

[doberman-guy]

I have a lower (omc) and it has no numbers on it. How can you tell what size, and or year this is? It has the shift cables on it yet.

 

[Howard Sterndrive]

Re: How do you tell one omc lower from another?

the absence of a rectangular zinc anode behind the 6 idle relief holes says it is a 1978-1981 hydromechanical shift lower. If it has a 13 spline propshaft, it is a 400 series. If it has 15 spline propshaft, it is an 800 series.

 

[doberman-guy]

Re: How do you tell one omc lower from another?

Thank you

 

[kylejb2663]

Re: How do you tell one omc lower from another?

How are you able to tell the difference with an OMC Cobra Drive unit? Correct me if I am wrong but OMC Cobra's are not Electric Shift Correct?

 

[Howard Sterndrive]

Re: How do you tell one omc lower from another?

How are you able to tell the difference with an OMC Cobra Drive unit?

it looks nothing like a Cobra

Correct me if I am wrong but OMC Cobra's are not Electric Shift Correct?

correct, but the drive pictured is not electric either.
Electric shifting outdrive production ended in 1977, almost a decade before Cobras were introduced