Pinion Shaft snapped EVO

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Dec 21, 2012 | 08:35 AM

flh04087

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From: ME

Pinion Shaft snapped EVO

ive being having a problem with my pinion shaft nut always loosing up well it did it again so i pulled the nose cone off to find the pinion shaft laying on the bottom of the chest? its a clean break any ideas why this would break ? has anyone else see this ??

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Dec 21, 2012 | 01:31 PM

Spanners39

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Joined: Dec 2010

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From: Coromandel Peninsula New Zealand

Not seen but heard of it, sometimes attributed to badly aligned crankshaft.

Dec 21, 2012 | 02:32 PM

miacycles

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Joined: Sep 2007

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From: Bluffton, South Carolina

+1 0n spanners comment. This end doesn't normally break!! Is there something binding up the valve train or oil pump????
John

Dec 21, 2012 | 02:39 PM

flh04087

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From: ME

this thing ran so smooth i think the bottom end bearing gave up and thats why i was having such a problem i guess i will know what happened when i pull it down i have a new 92 bottom end already so im changing the oil pump and drive , cam and lifters so i wont have the same problem hopfully

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Dec 21, 2012 | 03:10 PM

chopperb1

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From: chicago

I never seen it happen on an evo. I had it happen on my ironhead once. Nothing was locked up in the motor or trans. Never did find the cause.

Dec 21, 2012 | 04:57 PM

Uncle G.

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Joined: Jun 2010

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From: Upstate New York

The only cause I can think of would be either a bad alignment problem with the crank, or the introduction of a foreigh object into the cam or oil pump gears, like maybe a piece of a tappet roller needle.