Blubber Posted June 13, 2018 Share Posted June 13, 2018 pump jammed, causing teeth to shear of, misaligned gear during reasembly? dunno. - have all the teeth been accounted for? Quote Link to comment
FJD Posted June 13, 2018 Author Share Posted June 13, 2018 (edited) story so far: i´ve sold ths perfectly working B12 few weeks ago. Today he calls to tell me he wanted to have the clutch being replaced by some mechanic. Before getting there from his words there was a "bang" on the traffic lights, and then he pushed the bike to his mechanic (which i do not know if he is a pro, or just some friend of the Bandit Buyer). My question: what could have possibly gone wrong ? Or do they want to fu... with me, because the mechanic screwd up while doing the clutch ? Maybe impact wrench - failure ? I don´t want to be unfair, but this bike worked very well all the time i had it, never had any problems at all. Edited June 13, 2018 by FJD Quote Link to comment
FJD Posted June 13, 2018 Author Share Posted June 13, 2018 7 minutes ago, Blubber said: pump jammed, causing teeth to shear of, is this a common failure ? Quote Link to comment
Blubber Posted June 13, 2018 Share Posted June 13, 2018 Just now, FJD said: is this a common failure ? Not that i know... but i am not a b12 expert. calling @fatblokeonbandit to the desk just a technical cause for this. Quote Link to comment
Duckndive Posted June 13, 2018 Share Posted June 13, 2018 (edited) They only normaly break if you don't get the teeth lined up when assembling it..."So Ham Fisted mate by the look" tell him to do one PS I would toss back why does it have a different clutch cover gasket now ? It had a cometic one on it when I sold you it line Edited June 13, 2018 by Duckndive Quote Link to comment
FJD Posted June 13, 2018 Author Share Posted June 13, 2018 i have a half torn apart b12 engine in my workshop with a blown oil pump (it´s cracked), and i do not recall it to have broken teeths. I do not know what caused it to crack, as i´ve bought that engine stuck as it was Quote Link to comment
FJD Posted June 13, 2018 Author Share Posted June 13, 2018 7 minutes ago, Duckndive said: They only normaly break if you don't get the teeth lined up when assembling it..."So Ham Fisted mate by the look" tell him to do one PS I would toss back why does it have a different clutch cover gasket now ? It had a cometic one on it when I sold you it line what i wanted to hear....but there are a few teeth broken, some in between are good again - that´s funny somehow ?! just misaligning would only break a few, just the ones in contact i think Quote Link to comment
Duckndive Posted June 13, 2018 Share Posted June 13, 2018 11 minutes ago, FJD said: what i wanted to hear....but there are a few teeth broken, some in between are good again - that´s funny somehow ?! just misaligning would only break a few, just the ones in contact i think yes but if he then started it up as they had not noticed the #uc# up ...Bang more teeth......looking at the gear on the back of the clutch basket would help / show the full damage... Quote Link to comment
fatblokeonbandit Posted June 13, 2018 Share Posted June 13, 2018 Looks like the classic clutch basket removal and not re fitting it properly, if the drive gear for the pump and alternator arent meshed before tightening the clutch hub, it will break the oil pump teeth, have a look at the alternator drive gear and see if thy are bust as well. never known a pump to fail and jam.. Quote Link to comment
FJD Posted June 13, 2018 Author Share Posted June 13, 2018 So boils down to 2 poss mistakes: A) Oil pump stuck B) mechanic's bodgery/misaligning If i take out the clutch, and cannot rotate the oilpump by hand it's A i guess ? Quote Link to comment
fatblokeonbandit Posted June 13, 2018 Share Posted June 13, 2018 It wont be ghe pump they dont just seize for no reason if the clutch has been removed its 99% that the gears wert aligned 2 Quote Link to comment
FJD Posted June 13, 2018 Author Share Posted June 13, 2018 Yes i certainly believe you are right, but do you think my assumption of A or B is correct ? Quote Link to comment
fatblokeonbandit Posted June 13, 2018 Share Posted June 13, 2018 Yup, realisticaly thats the causes Quote Link to comment
FJD Posted June 13, 2018 Author Share Posted June 13, 2018 (edited) i just dismantled the clutch on the B12 lump with cracked oil pump i had lying around, and one more possible reason crossed my mind: no clutch holding tool combined with an air gun/impact driver could have broken the teeth, as the crank won´t be able to rotate backwards becaus of starter sprag clutch. Im definitly sure, it could not happen during running engine, and i do not think the oil pump is stuck. Also talked it over with my uncle, who´s a very good self teached engine builder (runs a 600hp Superstreetbike Kwaker turbo), and he has come to the same conclusion. Tomorrow evening i will drive to this guy, take out the clutch, and see if the oil pump spins or not. Edited June 13, 2018 by FJD 1 Quote Link to comment
yoshi Posted June 13, 2018 Share Posted June 13, 2018 (edited) i was thinking no clutch tool myself and something jamed in betwen the gears , yoshi Edited June 13, 2018 by yoshi Quote Link to comment
FJD Posted June 14, 2018 Author Share Posted June 14, 2018 Soo...he has a brand new clutch, a hand -rotatable oil pump, and a lot of missing tooths on both gear wheels. Told him point blank that the failure was up to the one who changed the clutch. 4 Quote Link to comment
Gixer1460 Posted June 14, 2018 Share Posted June 14, 2018 What's the betting the mechnik almost got it right and just cracked one or two of the teeth, then after completing the work , he hit the starter and .......... carnage resulted. Those little starters have so much torque, a damaged pump gear don't stand a chance - expensive mistake! 1 Quote Link to comment
Gsxrsam Posted June 14, 2018 Share Posted June 14, 2018 It is a "very" common mistake........only usually done once tho........:) Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.