[Fot] tr 3 cam sprocket bolts sheared

[Catpusher at aol.com]

I had a close call where the factory cam-to-chain wheel set screws had  
stretched and only the lock tabs (and the timing of my routine  inspection) 
saved the day.  I talked to the Triumph parts manager, and  he sold some up 
rated set screws to me.  They had the same part# but you  can ID them easily as 
the top of the heads are rough looking.  I stopped  reusing old one factory 
ones!
 
Hardy
 
 
In a message dated 4/17/2010 11:54:18 A.M. Pacific Daylight Time,  
fot-request at autox.team.net writes:

From:  KENMUN at aol.com
Subject: [Fot] tr 3 cam sprocket bolts sheared
To:  fot at autox.team.net
Message-ID:  <6e60.51066657.38fb121b at aol.com>
Content-Type: text/plain;  charset="us-ascii"

fot, at a recent race at sebring the old tr 3 went  "bang" and stopped  
running. external signs were that the engine  turned over like there was no 
 
compression, the dist. didn't turn and  the push rods weren't going 
up/down.  
inside the cam sprocket bolts  were sheared and the chain cover center bolt 
was  
sheared. the crank  turns freely, the cam turns freely and the valves go 
up/down  with no  extra effort. the bolts were the stock shoulder bolts, 
the 
locking  tab  was in place with the ears bent up in lock position.any  
ideas/suggestions as to  why the bolts broke? thanks, ken m. tr 3  vintage  
racer