RobinTR Posted March 23, 2020 Report Share Posted March 23, 2020 Found the drive gear on the oil pump/distributor shaft is loose (rotates a few degrees). The gear for the PI metering unit is fine. I see the main suppliers still stock replacement Mills pins, so is this a common problem? I assume that the pin should be driven out with a small punch (tapping on the end of the pin which still has a slightly conical end). I will try to support the gear to avoid damage, but any other advice? Can I expect to find wear on the pin, or a slightly enlarged hole in the shaft? If the latter, then any suggestions as to how to remove the slop? Quote Link to post Share on other sites
ed_h Posted March 23, 2020 Report Share Posted March 23, 2020 Use a spring roll pin instead of the Mills pin. The "spring" will take up the slop. Ed Quote Link to post Share on other sites
boxofbits Posted March 23, 2020 Report Share Posted March 23, 2020 (edited) 56 minutes ago, ed_h said: Use a spring roll pin instead of the Mills pin. The "spring" will take up the slop. Ed I think a sprung roll pin is sound advice. The only problem I see is that if the gear has been moving a few degrees on the shaft for some time, the holes on the gear could be slightly out of round and slightly larger than in the pin itself. I would say re-drilling both with a slightly larger pin might be a better solution. Kevin Edited March 23, 2020 by boxofbits Quote Link to post Share on other sites
ed_h Posted March 24, 2020 Report Share Posted March 24, 2020 The gear on mine was loose, too, but the holes didn't appear to be oversized. The spring pin in its relaxed state is a little larger than the holes. It can expand into a hole that may be slightly oversized. In my case, the pin tightened up the joint very well. If it hadn't, I might have tried a larger pin or something else. Ed Quote Link to post Share on other sites
John L Posted March 24, 2020 Report Share Posted March 24, 2020 You could also use some Loctite 609 Green high strength, as well as the pin. Quote Link to post Share on other sites
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