[Shotimes] Valve Clearance

[Donald Mallinson]

Jim,

Clearances open up as the top of the valve stem wears.  I also wonder if 
the underside of the bucket wears some too?   Valves usually don't 
recess much anymore with hardened valve seats and higher quality metal 
in the valves themselves.  Also as you check the clearance with the 
original shim, the shim itself can wear some.   I haven't tried it but 
if you flip the shim over, the clearance should tighten up just a little 
as the underside won't have the wear that the top side had.

I understand you can flip them over.

Don Mallinson

James White wrote:

>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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