10-11-2018, 10:41 PM
(This post was last modified: 10-11-2018, 10:51 PM by Tony Press.)
(10-11-2018, 07:52 AM)Chris KC Wrote:(10-11-2018, 12:44 AM)Tony Press Wrote: Our Club Secretary had a comprehensive engine failure with a Club three bearing crank when returning from a Club run earlier this year. The faiilure is through the rear web.
He has now has a new engine with a two bearing crank.
Has there been a meaningful investigation of WHY it failed Tony? I ask because both my Ulster rep and Nippy have been running on Reliant 3- brg cranks - these are pressure-fed so also drilled - since about 1984, without a murmur. I had the Ulster engine apart for overhaul recently and took the opportunity to crack test it but nothing found. The Nippy doesn't get out much but the Ulster has taken me all over Europe.
Careful examination showed the crack spread from the journal corner radius through the web- possibly from an inclusion in the casting.
It was a standard splash fed three bearing crank made locally using the ADI process.