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Buell Forum » Old School Buell » Archive through August 22, 2014 » Pinion shaft broke - fixable ? « Previous Next »

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Mhlunsford
Posted on Saturday, August 16, 2014 - 11:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My pinion shaft Broke
Is the pinion shaft part if the crankshaft or does it somehow separate ?
Pinion shaft
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Stev0
Posted on Sunday, August 17, 2014 - 12:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

New crank.
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Dpb
Posted on Sunday, August 17, 2014 - 08:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

What year? It should be repairable.
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Buellistic
Posted on Sunday, August 17, 2014 - 08:57 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

These shafts are replaceable !!!
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Lynrd
Posted on Sunday, August 17, 2014 - 09:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Bummer

It's going to be a pretty major operation, but the shafts can be replaced. I'd have to grab the shop book for your engine, but on the earlier engines at least the Pinion shaft is in a tapered hole with a keyway and a big nut on the back inside the flywheel that gets tourqed pretty high.

It's going to mean splitting the cases, which means she comes all the way down. The wheels should be checked for true and probably will need to be re-trued, and balance should be checked. These sorts of jobs always turn into "While I'm in there anyway" money pits for me.

Is this on your M2 or the new S2?
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Mhlunsford
Posted on Sunday, August 17, 2014 - 01:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

This is the M2 2000. I had case side case off put back together and rode a maybe a mile before it quit - broke. This was after putting in a new stator along with a 8 bolt magnet (chewed up stator).
Maybe I did something wrong. The idea of rebuilding an engine does sound like a money and time pit. May just find another engine and be done.

This engine had a new crank and pistons put in about 7K ago by a shop that was very - I had problems from day 1.

My S2 was owned by a HD mechanic from modesto and it is solid - done right.
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Stev0
Posted on Sunday, August 17, 2014 - 10:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

On the 2000 model bikes you can not replace the pinion shaft...

it's a new crank..
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Stev0
Posted on Sunday, August 17, 2014 - 10:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Here's some pics of a 1998 3 piece crank and a 2000 3 piece crank... The shafts are part of the wheels.

I can't recall offhand the last motor HD had a 5 piece crank in it but the last ones I recall working on were a Shovel and Ironhead Sporty.












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Reepicheep
Posted on Monday, August 18, 2014 - 08:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Dang. I can't imagine the forces required to shear that shaft.
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Phelan
Posted on Monday, August 18, 2014 - 10:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Good time to update to the S&S assembly with a splined pinion shaft ; ).
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Oldog
Posted on Monday, August 18, 2014 - 05:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Bill think Fatigue
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Reepicheep
Posted on Monday, August 18, 2014 - 07:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hard to imagine enough flex on there to fatigue in the first place, it is so short (no leverage) and so thick.

So again, dang!

Are you thinking bent crank causing a little flex with every rotation?
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Stev0
Posted on Monday, August 18, 2014 - 08:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I've seen failures like this in heavy industry. There is a step down which gives a stress point.. If there is a bit of crud behind the oil pump drive gear when it is assembled then it will give a bit of side loading... Add to that flex and harmonics which will work any stress points in the shoulder and you have exactly what occurred.

A slightly bent crank will also add to any alignment issues. I have a particular way of aligning my cranks to help aleviate exagerated alignment issues under load.
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