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1999 Honda BF25 shift rod seal replacement

S

Stoehrdp

New member
I was coming back when my motor started grinding at hi revs. I got her back to the ramp and took her out of gear and she sounded fine when I revved her up in neutral. This morning, I checked the gear oil and it was milky. I last replaced it in the spring about 45 hours ago on the motor.

The motor is a 1999 Honda BF25 Long Shaft

I removed the lower unit and did a pressure test, saw some bubbles coming from shift rod water seal.

My Honda service manual is not clear on how to replace it. Does anyone have any experience replacing this seal? Do I need to remove lower rod? If so How?


Thanks in advance
Dave
 
Once you have dropped the leg you should be able to gently pry the old seal out be careful not the scrape or damage any metal faces . Then to mount the new seal you may want to place insulation tape over the threads on the shift rod to ensure you don't nick the new seal. Rub your hand up and down the shift rod to check for burs or nicks. Sand down any rough spots cover the seal hole with a rag beforehand to keep crap out of the seal hole. Once you are satisfied that all is smooth give the shaft a light grease to help the new seal slip down grease also the seat that the seal sits in to help mount it it also helps keep the rubber 'fresh' as well as keeping salt out. You should then be able to get it gently into place. If you need to knock it finally into place use plastic or soft wood i.e. Not metal. Good luck.
Dean.
 
I only have experience with the newer BF 20 D. The shift rod seal on that outboard requires that the lower shift rod be removed to properly replace the seal. Removing the shift rod requires some disassembly of the transmission.

Hopefully someone else has better news. But, it's really not as bad as it sounds
 
Deanmck said:
Once you have dropped the leg you should be able to gently pry the old seal out be careful not the scrape or damage any metal faces . Then to mount the new seal you may want to place insulation tape over the threads on the shift rod to ensure you don't nick the new seal. Rub your hand up and down the shift rod to check for burs or nicks. Sand down any rough spots cover the seal hole with a rag beforehand to keep crap out of the seal hole. Once you are satisfied that all is smooth give the shaft a light grease to help the new seal slip down grease also the seat that the seal sits in to help mount it it also helps keep the rubber 'fresh' as well as keeping salt out. You should then be able to get it gently into place. If you need to knock it finally into place use plastic or soft wood i.e. Not metal. Good luck.
Dean.
Click to expand...


Thanks for the reply. I have ordered the part and will try this weekend
Dave
 
It was a royal pain and not pretty, but I managed to get it out and the new one on. Followed your advise about the threads. Holds air fine as I tested with 6# for 1/2 hour. Calling it good. Thank you for the replies
 
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