RE: Valve Clearances

[Eric Sheley <eric@xxxxxxxxxx>]

At 10:16 AM 07/13/1999 -0700, Retherford, Martin wrote:
 >I am currently at 10247 miles which means in about a month or so I will be
 >doing the 12000 mile check up.  I did not do a 6000 mile check on the valves
 >because I am not paying for it.  I will let you know what my results are.

Thanks - mare sure to have the dealer note on paper each clearance 
separately so you don't end up hearing "one was out of spec" - because as 
soon as you ask which one, you may get a blank stare ......

 >Eric is correct about not having an established pattern yet.  He is also
 >right about break in being a possibility.  I think we can be fairly certain
 >however that the valves were in spec when they left the factory.  So there
 >is two points to plot a line for.

Like I said - crude example - I knew I was going to be in trouble when I 
said one point, but it was easier than saying 2 points where 1 could be 
anywhere in a range of numbers......  ;-)

I realize that it is very unlikely that the bike would leave Triumph out of 
spec. My point was more that we don't know what spec is. On the inlet, 
acceptable clearance is 0.10 to 0.15 mm  - On the outlet, 0.15 top 0.20 mm. 
The problem is that two bikes leaving the factory - one at 0.10 inlet and 
the other at 0.15 inlet would both be in spec. If we opened the bike up at 
6k and found 0.10 we would have no way to know if the clearance had changed 
at all. But looking at the clearance, one would naturally say that it has 
almost dropped out of acceptable limits - but we really don't know if it 
has changed at all........


 >Is there anybody on the list who has had problems with valves in previous
 >years of this motor?

98 T509 - performance problem caused dealer to check the valves at around 
2k miles  - 1 was out of spec by 0.01 mm - all others were well within spec.

- - Eric


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