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Grumpy old hasbeen
Join Date: Feb 2019
Location: Perth, Western Australia
Posts: 98
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i have seen starters where the mechanism that engages the starter pinion into the ring rear has failed. usually sounds like 'klunk whirrrr'
So even if the starter motor turns over, if the pinion does not move to engage the ring gear, the motor won't turn.
Disclaimer - my experience here was not with Porsche 911 starters
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