[Healeys] cam failure

[warthodson at aol.com]

A friend recently had a reground cam fail after a few years of normal use. The engine had been professionally rebuilt. There are several possible explanations, however one unusual thing he discovered is that the wear on the lobes & tappets is only apparent on cylinders 4,5 & 6. The worst visible wear is on the exhaust valve lobe/tappet of Cyl 6. & the least wear is on the exhaust valve lobe/tappet of Cyl 4.
Cyls 1,2 & 3 appear to be in very good condition.      

Does this suggest any specific cause for the failure? 

He will be having the cam & tappets replaced & will be using a Piper Camshaft, for an Austin Healey 3000, it is Part No. AH3BP270 (Fast Road) and is from a “billet” and not a regrind.

Are the Piper Cams generally considered good quality?

Any comments on this subject would be appreciated.

Gary Hodson
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20180325/44ad99f5/attachment.html>