Broken oil pump drive pulley, help

Nick Squire

New Member
Aug 8, 2013
80
0
0
Montreal, Quebec, Canada
Hey guys,

The end of last year my oil pump drive pulley snapped off, today I finished opening up my 7m to check whats going on, nothing seems seized, I can turn the engine over just fine by hand, I can also turn the oil pump shaft without a problem. If anyone has had a similar problem or knows what happened it would be great to find out, my teacher took a look and isn't sure either. I know that Beech performance has their retention plate that they sell but my plate looks fine and fully intact, so I don't see what went wrong.

This is the pulley hanging where it should be, you can see its broken and quite a bit of metal was sheered away
IMG_0179_zpsja1fdjpl.jpg

This is the inner section of the pulley
IMG_0182_zpslup23kca.jpg
 

Piratetip

Far From Maddening Crowds
Staff member
Super Moderator
Dec 30, 2005
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MKE, WI
Take some macro photos of the spokes and center.
Will be pretty easy to determine failure mode.
Likely cyclic stress crack propagation.
 

Nick Squire

New Member
Aug 8, 2013
80
0
0
Montreal, Quebec, Canada
Thanks guys! I read almost everything you guys posted and I'm in the midst of checking if a friend of mine can get the older style pulley for me, if not then I'll get the new one and be sure to be extra careful installing it!