[Shotimes] Valve clearances info

[ROBERT SCHIRMER]

Mike

I just completed my valves adjustment on a '93 ATX with 120,000+ miles that
never had the valves adjusted. I agree with the rest of the Shotimes list
members.  Most of my valves only required me to flip the valve shim over.

here is a good link with pictures for the valve adjustment, and it includes a
link to an excel spreadsht doner by Scott Patterson for you to calculate what
size shim you need to put back into place.

 http://www.kurtmetros.com/valvelash.html<http://www.kurtmetros.com/valvelash
.html>

FYI- Most of my old shims were between 2.45 and 2.55 MM; and what I needed was
a bunch of 2.6 mm shims, that we not in the kit I got. The next size I got in
the kit was a 2.65 mm, then it went to 2.7 & 2.75 (which was the max of the
set)

Good luck
Bob
  ----- Original Message -----
  From: Grant Butler<mailto:shogrant1@satx.rr.com>
  To: TechSHO@topica.com<mailto:TechSHO@topica.com> ;
shotimes@autox.team.net<mailto:shotimes@autox.team.net>
  Sent: Sunday, March 21, 2004 7:30 PM
  Subject: [Shotimes] Re: Valve clearances


  Here's the specs for the valves if anyone needs them ...


  ----- Original Message -----
  From: "Donald Mallinson" <dmall@mwonline.net<mailto:dmall@mwonline.net>>
  To: <TechSHO@topica.com<mailto:TechSHO@topica.com>>
  Sent: Sunday, March 21, 2004 10:26 AM
  Subject: Re: Valve clearances


  > Almost never does the valve recess causing tight clearances.
  >
  > The most common adjustment is to the exhaust valves.  Most
  > SHO's at about 150,000 miles need 3 or 4 exhaust valves
  > brought back into range.
  >
  > Shim thickness varies depending on original valve length,
  > valve seat tolerances and cam lobe variation.  Usually most
  > clearances are just .001 or .002 out of "range" but to bring
  > them back into perfect center adjustment may take .004 or
  > .005 shim thickenss increase.
  >
  > Much higher wear would be a factor of possible failure of
  > the hardening of the shim, cam lobe or valve stem or all
  > three would be my guess.
  >
  > I rarely hear of SHO's with valve clearances that go all out
  > of whack.
  >
  > Don Mallinson
  > SHO Club
  >
  > Mike Thompson wrote:
  >
  > > For those who have found abnormal shim clearances when doing the 60K,
  > > which direction have said clearances gone? IOW, what starts to wear the
  > > most first?  Do the valves recess into the seats and reduce clearances,
  > > thus requiring smaller shims, or does something else happen?  Why would
  > > someone's clearances radically increase, requiring shims in the ~2700
  > > range?  Not raced or even driven particularly hard.
  > > Mike
  > >
  > >
  >
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