[Shotimes] Valve Clearance

[Leigh Smith]

Cam, shim and valve stem tip wear would cause it to open up.
Valve seat wear would cause it to shrink.
Usually both happen at once, so it's hard to predict which one dominates.
As long as it was in-spec I would leave it alone. Remember the spec is a
range not one number.
If it's out of the spec range I would change it.
Too loose would cause extra vibration and possible accelerated cam wear.
Too tight could burn a valve.
Lee

----- Original Message ----- 
From: "James White" <greensho@crown.net>
To: <techsho@topica.com>; <shotimes@autox.team.net>
Sent: Sunday, November 13, 2005 9:43 PM
Subject: [Shotimes] Valve Clearance


> Just got done with the complete and long overdue 60k on the '95mtx.
>
> #1 exhaust valve was quite sloppy with a 2500 shim.  The fattest
> shim that I had was a 2550 and even with that the lash is .016".
>
>
> Is there a 2600 or a 2650?
>
> Wonder what causes the valve clearance to open up.  One would think
> that it would shrink.  This was one of 3 that had opened up.  3 other
> valves had to have shim thickness taken out.  I flipped the shims
> on all of the other valves.
>
> How soon should I tear back in to the thing, or just let almost well
> enough alone and change it at the next 60K?
>
> regards, Jim White
> '93 mtx - 285k
> '95 mtx - only 186k
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