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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through February 28, 2007 » 99 s3t leaking oil out crankcase breather hose « Previous Next »

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Dbuell99tbolt
Posted on Friday, September 01, 2006 - 08:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My 99 s3t is leaking oil out crankcase breather hose. Usually about 3/4 a quart a month drip drip drip everywhere i go.
Anyone have any suggestions?

Thanks
Dominick

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Cyclonemick
Posted on Saturday, September 02, 2006 - 09:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Possible Crankshaft seal? That's what the M2 did when it went south.
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Dbuell99tbolt
Posted on Sunday, September 03, 2006 - 01:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

thanks, i hope its not that, does anyone else have any ideas ?

thanks,
dominick
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Naustin
Posted on Wednesday, September 13, 2006 - 10:47 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Maybe you're just overfilling it? I have heard that the s3 has a certain level it 'likes'. If you fill to the top of the "full" mark on the dip stick, the bike will puke oil until it gets to the level it 'likes'. That level might be smack in the middle of the dip stick range. If you leave it at that level, it might stop blowing oil out??
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Blake
Posted on Wednesday, September 13, 2006 - 02:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

A leaking crankshaft seal would most likely lead to oil coming out of the transmission breather not the crankcase breather.

Overfilling is one thing to ensure is not happening. Be sure to only check and fill oil immediately after shutting down a warmed-up engine. This is to avoid an artificially low level shown on the dipstick as some oil migrates from the tank to the crankcase.

But most likely you already are well aware of that. In that case, a thorough compression and leakdown test on each cylinder on a warm engine may reveal possible piston-ring sealing issues. The excessive blow-by resulting from poor ring seal can be enough to push oil out the breather.

The addition of a catch-can would be a good idea to help you gage for certain how much oil is exiting the crankcase breather versus how much you are adding.
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Blake
Posted on Wednesday, September 13, 2006 - 02:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

And as Naustin advises, try filling to halfway between the low and full marks on the dipstick and don't add oil until the level drops below the low mark.

Next time you change the oil, add the specified amount, get the engine warmed up, then check to see where on the dipstick the oil level. Use that level as your not to exceed "full" level and see if the excessive oil consumption decreases.
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Dave
Posted on Thursday, September 14, 2006 - 08:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Like others have said...Run as close to the lower mark as possible.

DAve
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Dbuell99tbolt
Posted on Saturday, September 16, 2006 - 05:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

thank you all for your responces .i fill the oil "after letting it warm up" to the half way piont and if i let it it getts so low that no oil will be on the dipstick this happen the first time i had oil put in it.
thanks,
dominick
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Dbuell99tbolt
Posted on Saturday, September 16, 2006 - 06:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

what kind of catch canare you talking about? how do i make one or where can i buy one

thanks dominick
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