Rebuilding Connecting Rods -- Dragonman's Machine Shop

Published on November 20, 2021
Duration: 10:30

This video details the process of rebuilding Harley Davidson connecting rods at Dragonman's Machine Shop. The instructor, Holly Davis, demonstrates the removal and installation of bushings and races using specialized tools and a press, emphasizing the importance of precision and using quality American-made components. The guide covers straightening bent rods and the final honing process to achieve precise measurements for optimal engine performance.

Quick Summary

Rebuilding Harley Davidson connecting rods involves removing old bushings and races with custom tools and a press, then installing new ones while monitoring tonnage. Rods are checked for straightness and straightened if necessary. Finally, the bores are honed to precise specifications using a rod reconditioning machine for optimal engine performance.

Chapters

  1. 00:00Introduction to Connecting Rod Rebuild
  2. 00:11Custom Tooling for Rod Rebuilding
  3. 00:21Removing Connecting Rod Bushings
  4. 00:41Installing Connecting Rod Bushings
  5. 01:35Removing Connecting Rod Races
  6. 02:59Tool for Installing Rod Races
  7. 03:04Installing Male Connecting Rod Race
  8. 03:44Installing Female Connecting Rod Race
  9. 05:24Checking Rod Straightness
  10. 06:07Straightening a Bent Connecting Rod
  11. 06:48Verifying Straightness After Correction
  12. 07:07Rod Reconditioning Machine
  13. 07:24Honing Connecting Rod Bores
  14. 08:21Switching Mandrel for Wrist Pin Bushing
  15. 08:40Honing Wrist Pin Bushings
  16. 09:34Recommended Bearings and Crank Pins

Frequently Asked Questions

What are the key steps in rebuilding Harley Davidson connecting rods?

The process involves removing old bushings and races using specialized tools and a press, installing new ones with precise tonnage control, checking and straightening the rods for alignment, and finally honing the bores to exact specifications for optimal engine performance.

What specialized tools are used for rebuilding connecting rods?

Custom-made, heat-treated punches are used for removing and installing bushings and races. A press with a tonnage gauge is essential for accurate installation, and a rod reconditioning machine with specific mandrels is used for honing.

How is the straightness of a connecting rod verified?

Straightness is checked using a measurement device and feeler gauges. The rod is placed on a surface, and the gauges are used to detect any deviation from a perfectly straight plane, ensuring a slight drag indicates proper alignment.

What are the recommended components for a connecting rod rebuild?

It's recommended to rebuild original Harley Davidson connecting rods and use high-quality, American-made components like Torrington roller bearings. For crank pins, Jims Machining or Easton Motorcycle Parts are suggested suppliers.

What is the purpose of honing connecting rod bores?

Honing the connecting rod bores, including the wrist pin bushings, is crucial to achieve precise internal measurements. This ensures a perfect fit for the crankshaft journals and piston wrist pins, critical for engine longevity and performance.

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