Morning,
New guy here. I have inherited my father's 68 305 dream. I've done some work to get her up and running well, but the oil seals were leaking massively on the right side so I ordered a seal kit. Even after replacing all the right side cover seals, she's still weeping some. I haven't pulled the side cover off again to verify which one(s) are leaking, but they were all leaking previously. I'm pretty sure that the clutch pushrod has some wear in it and it may be the biggest culprit. Can anyone share some advice/opinions on how to approach this? I'd really love to completely seal this thing up. I replaced the seals for him about 20 years ago and they held up well for a long time.
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305 oil seal leaks
- Tim Allman
- honda305.com Member
- Posts: 512
- Joined: Tue Dec 02, 2014 9:25 am
- Location: Guelph, Ontario, Canada
Re: 305 oil seal leaks
It may well be the clutch pushrod. Pull it out and have a look. You will probably find that it has been worn down a bit at the seal. This can go on for a long time without leaking but leak it will at some point. The last time this happened to me I just replaced the seal and it continues to, well, seal. Given that both the pushrod and the rubber seal wear and that the rubber should wear faster than the steel, I'm guessing that the rod is not worn enough that replacing only the seal can't stop the oil. Yours appears to be beyond that point.
CMS has some NOS rods https://www.cmsnl.com/products/rod-clutch_22850259010/ for what seems a reasonable price but there are also others around.
CMS has some NOS rods https://www.cmsnl.com/products/rod-clutch_22850259010/ for what seems a reasonable price but there are also others around.
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hoodooman1
- honda305.com Member
- Posts: 2
- Joined: Wed Oct 15, 2025 12:53 pm
Re: 305 oil seal leaks
Thanks for the info! Much appreciated.

