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Post Info TOPIC: Sprag clutch issues - checklist

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Sprag clutch issues - checklist

Starter clutch.jpg


If you are going to the expense or replacing the starter clutch (#10 in the fiche pic above) there are a few things to check to make sure your investment pays off:

  1. Make sure that the boss on the large starter gear #7 (the sprag depends on this one to work properly) in good condition, not worn and with no pitting, scoring, ridges or other damage that might prevent the sprag doing its job.
  2. All the teeth on starter gears #7, #4 and #1 should be in perfect “sharp” condition with no rounding, burrs, roughness, wear or chips on the teeth. In particular, gear #1 has to be perfect.
  3. Check the bearings #2, #5 and #9 are all OK along with their housings and, in particular the housing in the starter gear cover for bearing shaft #3. There shouldn't be any movement that would allow the gears to misalign.
  4. Check the generator cover isn't cracked or damaged in some way that would allow movement of the gears and consequent meshing problems. A tell-tale sign of a cracked cover is an oil leak from around the starter gear cover area.

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Exeter, Devon, UK

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