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Buell Forum » Old School Buell » S2 Thunderbolt » Archive through February 05, 2013 » Crankcase ventilation « Previous Next »

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Bernard
Posted on Tuesday, December 04, 2012 - 03:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

While dealing with my charging/battery issues, I discovered that a hose is just hanging there. It goes down to the crankcase and must be a ventilation hose. My uneducated guess is that is somewhere should connect to another hose going to the carburetor? Anyway, should I leave it alone or should I connect it? And, if so, where do I route it and what do I connect it to? I consulted the Service Manual but didn't find it.



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Hootowl
Posted on Tuesday, December 04, 2012 - 06:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The tranny vent hose doesn't connect to anything. Just be careful when washing to avoid directing a stream of water into it.
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Ratbuell
Posted on Tuesday, December 04, 2012 - 06:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yep, it's just an "up and out" vent hose for the transmission/primary. Leave it open, zip tie it to a frame rail to keep it from flapping (but don't squeeze it shut).
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Smoke
Posted on Tuesday, December 04, 2012 - 06:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

i usually point the open end down without pinching the hose and clamp or ziptie. tranny/primary vent. when it starts puking oil and you see the engine oil level falling it is time for a new crank seal.
tim
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Onahog
Posted on Tuesday, December 04, 2012 - 09:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It was factory zippped tied to the frame tube pointing down along side the voltage regulator on 95 models..HB
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Buellistic
Posted on Wednesday, December 05, 2012 - 10:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

For SAFETY, you "RUN" this breather hose to a catch can because if it blows oil on your tire you will understand "WHY" !!!
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Onahog
Posted on Wednesday, December 05, 2012 - 12:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

In 96 they ran the hose up behind battery and zipped tied to frame outa site.
As Rat stated,It is actually the vent for the trans/primary case, so, unless overfilled, it shouldnt emit any oil..The engine vents thru the head bolts/air cleaner as well as from the timer cover to the oil tank.
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Bernard
Posted on Wednesday, December 05, 2012 - 12:40 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 input. As usual, it's invaluable!
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Buellistic
Posted on Thursday, December 06, 2012 - 09:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Do not for get what happens when you motor sprocket seal goes bad and a transmission breather hose catch container prevents oil from getting on your rear tire !!!
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