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O-ring between crankshaft and timing gear?


Guest Anonymous
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Guest Anonymous

timing gear and... oh, wait a minnit-

is that a fix for an oil leak down the inside of the pulley? Certain motors leaked oil down the keyway, and out the front bolt hole. That could be what they're thinking.

But I've never seen one on the 5 or so m10's I've taken apart...

t

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Guest Anonymous

You did not say which manual advises to replace the o-ring, but I can say for certain that the OE BMW service manual says the exact opposite.

In section 11 21 501 "Replacement of crankshaft" they reference removing Woodruf key & the o-ring (shown in a picture), followed by an installation note which states "the o-ring can be omitted". I've never installed one & don't see a need for it. I've never had a pulley hub leak past the nut.

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