• Business & Industrial
  • It's a STARTER DRIVE PINION for a large diesel engine like an 18-wheeler truck or Diesel locomotive. It goes inside the starter motor housing. When the starter motor turns, the small gear moves to the end of the shaft, and engages the flywheel teeth. There is a one-way clutch inside, which transfers power from the starter motor to the pinion. The clutch only grips one way, so that when the engine starts, the pinion can turn faster than the engine, protecting the starter. The small spring moves the pinion away from the flywheel when the starter is off. The clutch/shaft combination is called a "Bendix drive", and gave the company its first product. The collar with the sideways screw goes on the end of the starter motor shaft, secured by the screw.

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It's a STARTER DRIVE PINION for a large diesel engine like an 18-wheeler truck or Diesel locomotive. It goes inside the starter motor housing. When the starter motor turns, the small gear moves to the end of the shaft, and engages the flywheel teeth. There is a one-way clutch inside, which transfers power from the starter motor to the pinion. The clutch only grips one way, so that when the engine starts, the pinion can turn faster than the engine, protecting the starter. The small spring moves the pinion away from the flywheel when the starter is off. The clutch/shaft combination is called a "Bendix drive", and gave the company its first product. The collar with the sideways screw goes on the end of the starter motor shaft, secured by the screw.

Bounty: $5.00

Posted By: HelpIdentify
Listed: October 06, 2015 Ends: January 04, 2016

I'd Like to Know:

I would like to know what this is.

Item History: N/A

Size: It is 5-1/2" long and varies in diameter.

Markings: There are no markings on the item but there are some on the bolts. Both have "Bendix-USA-" on them but their numbers are different, one has 2856 while the other has 2857.


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It's a STARTER DRIVE PINION for a large diesel engine like an 18-wheeler truck or Diesel locomotive. It goes inside the starter motor housing. When the starter motor turns, the small gear moves to the end of the shaft, and engages the flywheel teeth. There is a one-way clutch inside, which transfers power from the starter motor to the pinion. The clutch only grips one way, so that when the engine starts, the pinion can turn faster than the engine, protecting the starter. The small spring moves the pinion away from the flywheel when the starter is off. The clutch/shaft combination is called a "Bendix drive", and gave the company its first product. The collar with the sideways screw goes on the end of the starter motor shaft, secured by the screw.

By: HORNCAT

Submitted on: 10/18/2015 at 10:49PM
Accepted