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Broken Crank

steve200b
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89CAL Grand Master

89CAL

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Posted

Perhaps it was fitted incorrectly. Too much heat in the crank or retaining bolts/screws not installed properly

Just a random guess seen as it sounds like you had a crank collar installed and thats where it broke. Better photos of the fatigue point?

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steve200b Proficient

steve200b

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Very lucky made 480kw with some wheel spin and then lost 100kw and then started looking for the issue and found that. No other damage done lucky. Motor out today for another crank and some rings etc then back on the road in a few weeks

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89CAL Grand Master

89CAL

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Ill look at my wear guide later if I think of it but looks like it has fractured over a longer period of time. How long was this crank in use in this form for? And what Is the previous history of this particular part of the crank? (Heating to remove gear, crank collars on off etc)

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GTRPSI Mentor

GTRPSI

Posted
Posted

Looks like the woodruff key is at a slight angle and has moved inwards causing extra stress on the cranks snout.

Id say the balancer was moving on the crank and the vibration caused it to crack.

Ive heard similar about Ross dampners, that why we went with a ATI one from the start.

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