Drive shaft seal question

[Rrosenbloom]

I’m replacing the seals in my lower unit (20RL71S). The driveshaft seal I pulled is one seal and it’s thicker than what came in my new kit. Do I need an exact match, or can I use two from the kit I got?

 

[oldboat1]

Don’t know what kit you have, but the oem seal is 0321788; Sierra is 18-2032. Single seal.

 

[54bobby]

the seal is fine. i had the same concern but all is good.

 

[F_R]

If there is room, put both seals in, lower one lip pointing down, upper one lip pointing up. That will update it and be much better.

 

[Vic.S]

The parts website I just consulted has this note

Replaces OEM 0777537.

Please note the 0321788 is about 3/16 inch thick, it is thinner than the earlier version of seal but is still intended to replace earlier versions as shown in the cross reference search.

I.D. - 0.500
O.D. - 1.0
Height - 0.188​

Against the Sierra part there is this warning

California residents:

This product can expose you to chemicals which are known to the State of California to cause cancer and cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
​

 

[F_R]

Gotta love the California warning. Eating the seal can cause birth defects. Or something like that.