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Is This Ring Gear OK to Rotate?


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The ring gear of my rebuild has obvious teeth wear on opposite sides of the gear, e.g., 12:00 and 6:00  The teeth at e.g. 3:00 and 9:00 are not abused.  Abused teeth occupy <30% of the gear.  FAQers have stated (i) this type of two-site wear is not unusual and (ii) a reasonable fix is to rotate [NOT flip] the gear 90 degrees and allow the starter gear to engage areas with better teeth.  My machinist can do it.  I have no idea how this gear performed in its previous home.


REQUEST:  Please look at the photos below and see if you think gear rotation for this particular gear looks like a plan.


photo 1:  area 12:00

photo 2:  area 6:00, view 1

photo 3:  area 6:00, view 2

photo 4:  example of good teeth, e.g., 3:00 and 9:00











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215 or 228 mm ?

215 mm flywheels can be had fairly easily,  I have at least 2 extra laying around.

lightend 215mm flywheels are available for $250-299.

Rotating the ring gear is also an option I suppose  but would be my least likely choice

Edited by tech71
  • Like 1

76 2002 Survivor

71 2002 Franzi

85 318i  Doris

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The engine usually stops in about the same 4 places every time due to the firing order and compression, that's why you see wear in only certain areas of the ring gear.  I would rotate enough to miss all the bad teeth and let the starter use up the rest of the good teeth.


Thanks, Rick

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