Https://www.nortonow Nersclub.org/sites/d Efault/files/Main-Be Arings-v1.1.compress Ed.pdf

Main-Bearings-v1.1.compressed.pdf
Preview of https://www.nortonow nersclub.org/sites/d efault/files/Main-Be arings-v1.1.compress ed.pdf
🔗 Source: nortonownersclub.org
📊 Size: 1.6 MB
📄 Pages: 34 pages
⬇️ Downloads: 146

Summary

The Norton Commando, produced between 1967 and 1978, experienced excessive main bearing failures in 1972 and 1973, particularly with the 'Combat' engine. Norton resolved the issue using two types of roller bearings, one of which was named 'Superblend'. The FAG NJ306E cylindrical roller bearing, supplied under Norton part number 064118, is still specified and used today. The author examines various information sources, including the Norton Owners Club website, Access Norton Forum, and bearing manufacturer catalogues, and compares a modern roller bearing with others, including a new old stock RHP 6/MRJA30 'Superblend'. The conclusion is that only one of the two types of bearings that resolved the problems had modified rollers with a 'partial crowning' design, which narrowed the roller diameter by approximately 2.8 thousandths of an inch. This design is novel and results in a relatively minor narrowing of the roller diameter. The term 'Superblend' has no engineering definition and its use has become ambiguous, introducing confusion in discussions about main bearings. The author recommends basing discussions on bearing specifications, manufacturer's designations, and data. The document also concludes that bearings from manufacturers other than FAG are likely to be suitable, and there is no evidence that bearings with roller cages made of glass-fibre reinforced polyamide would be unsuitable for this application.

Description

The Norton Commando, produced between 1967 and 1978, experienced excessive main bearing failures in 1972 and 1973, particularly with the 'Combat' engine.

Technical Information

  • File Format: PDF
  • File Size: 1.6 MB
  • Pages: 34
  • Language: EN
  • Total Downloads: 146
  • Last Updated: 1 month ago

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