Bentrod425
Cadet
- Joined
- Jul 22, 2013
- Messages
- 10
The story: I have just finished a full tear down, seal replacement, and rebuild of the lower unit on a 1982 Evinrude short shaft after finding water in the lower unit last fall. This was my first time replacing seals on an OB lower unit, so was a learning experience. Everything seemed to go well enough following the instructions in the maintenance manual and from tips online. Once I got into it I found that the shifter yolk had been previously bent and had rubbed on the forward and reverse gears. The gears were fine, but the shifter yolk arms were worn. I ordered a replacement yolk and clutch dog cradle.
Reassembly went smoothly enough as far as I could tell. I used the recommended sealants and greases for the seals and o-rings for installation. To hold the clutch dog detent spring and detent balls in the prop shaft for reassembly I used a little marine wheel bearing grease, which worked great. I took the motor out for it's test run and ran it for about 20 minutes making sure I used it in forward and reverse and ran it at full throttle.
After letting it dry overnight I drained the lower unit fluid too see if it leaked. I used Evinrude HPFpro lower unit fluid.
The HPFpro going in is a honey colored fluid. I was sort of expecting that to come out, but what I got was darker and a little cloudy. After letting it sit for a couple of days, it does not appear to separate, so didn't think there was water leakage?nor did any water come out when I drained the lower unit.
I've searched around and can't find any info on what the stages of normal oil wear are. I do know it'll turn black after prolonged use.
I also wonder if the various Evinrude gasket sealers and wheel bearing grease that I used upon reassembly could have reacted with the HPFpro oil.
Please look at the pictures of the drained fluid and tell me what you think (normal, water leakage?other?).
Thanks for any input.


Reassembly went smoothly enough as far as I could tell. I used the recommended sealants and greases for the seals and o-rings for installation. To hold the clutch dog detent spring and detent balls in the prop shaft for reassembly I used a little marine wheel bearing grease, which worked great. I took the motor out for it's test run and ran it for about 20 minutes making sure I used it in forward and reverse and ran it at full throttle.
After letting it dry overnight I drained the lower unit fluid too see if it leaked. I used Evinrude HPFpro lower unit fluid.
The HPFpro going in is a honey colored fluid. I was sort of expecting that to come out, but what I got was darker and a little cloudy. After letting it sit for a couple of days, it does not appear to separate, so didn't think there was water leakage?nor did any water come out when I drained the lower unit.
I've searched around and can't find any info on what the stages of normal oil wear are. I do know it'll turn black after prolonged use.
I also wonder if the various Evinrude gasket sealers and wheel bearing grease that I used upon reassembly could have reacted with the HPFpro oil.
Please look at the pictures of the drained fluid and tell me what you think (normal, water leakage?other?).
Thanks for any input.

