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Message started by DavidOfMA on 07/20/16 at 11:03:14

Title: Oil filler cap o-ring
Post by DavidOfMA on 07/20/16 at 11:03:14

Anyone found a reliable substitute for the oil filler cap o-ring? Starting to leak there. Not worth shipping such a cheap part.

Thanks.

Title: Re: Oil filler cap o-ring
Post by Dave on 07/20/16 at 11:07:19

There is nothing special about that O-ring.

Take it off, and go to a hardware or auto parts store and let them match one up for you.

Title: Re: Oil filler cap o-ring
Post by DavidOfMA on 07/20/16 at 12:01:45

Great - rare off-the-shelf solution!

Thanks,
David

Title: Re: Oil filler cap o-ring
Post by stewmills on 07/20/16 at 12:53:00

Crap, I never really paid attention to the oring there....not positive that I have one but I've never had a leak.  

Maybe it is on there and is just tucked down onto the cap real tight and doesn't dangle so I've never paid any attention to it.  I might me making a trip to the hardware store too :o

Title: Re: Oil filler cap o-ring
Post by stewmills on 07/20/16 at 21:13:20

Mine's in there...just never paid attention to it. Thanks for making ma pay attention David.

Title: Re: Oil filler cap o-ring
Post by batman on 07/22/16 at 10:22:43

I...think ....the o-ring is there only to aid in helping removal,as the threads on the cap actually seal in the oil and pressure of the piston when it 's moveing down.when I replace my cap I use only one finger and my thumb and when I feel the o-ring contact the case I stop.Over tighting just damages the o-ring and makes it very hard to remove the cap when the motor is warm,say on a trip when you stop for gas and may need to top off your oil.(I carry a chainsaw oil bottle  4oz  of rotella for this need) I haven't replaced my 20yr old o-ring yet.

Title: Re: Oil filler cap o-ring
Post by Kris01 on 07/22/16 at 11:21:54

Yep, finger tight is all you need. Once it seats, you're pretty much done!

Title: Re: Oil filler cap o-ring
Post by DavidOfMA on 07/22/16 at 12:08:44

Most likely I wore out the o-ring on a very hot day where, en route, I decided to top off the oil. Finger tight on a hot engine is, I think, too tight on a cold one. Couldn't find an exact match locally, so I ordered one that should fit on Amazon as an 'add on' to a larger order.

Title: Re: Oil filler cap o-ring
Post by stewmills on 07/22/16 at 12:16:07

For anyone else looking...If you have an ACE hardware locally, they are a treasure for these little odd bits. I was in there just this week for another reason, and noted they have a large section over with plumbing valves and accessories that has a myriad of o-ring sizes in one of those big bins with the little labeled drawers.

Title: Re: Oil filler cap o-ring
Post by Garry on 07/23/16 at 00:08:42

If there is oil leaking past the filler cap and O ring it could indicate an excess of pressure in the crankcase? Is the motor burning an excessive amount of oil?

Title: Re: Oil filler cap o-ring
Post by batman on 07/23/16 at 09:47:02

excess pressure would more likely be caused by the breather hose being pinched some place between the head and the air filter box.

Title: Re: Oil filler cap o-ring
Post by DavidOfMA on 07/23/16 at 10:41:33


6467726B6768323E060 wrote:
excess pressure would more likely be caused by the breather hose being pinched some place between the head and the air filter box.


Could be something else, but until I try another o-ring and it still leaks, I'm going with the worn-out o-ring theory. To be continued.

Title: Re: Oil filler cap o-ring
Post by DavidOfMA on 07/30/16 at 12:02:32

While waiting for a 23mm x 17mm x 3mm o-ring from Amazon.com, just for kicks I decided to see if a seal conditioner, ATP AT-205 Re-Seal, would restore enough resilience to the o-ring for it to seal the filler cap again.

I couldn't remove the o-ring without destroying it because it had hardened, so I soaked the filler cap + o-ring in the AT-205. After about half an hour, the o-ring seemed softer. I put the filler cap back on the bike and rode it a couple days later.

So far, no leaks!

FOLLOW UP: Still no leaks 1,000 miles later. Though I finally located a replacement, I'm leaving it in until it leaks again.

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