[MR2] Compression ratio

[Aaron Willis]

Minor correction here: The shim number isn't necessary, because shims
are identified by application and thickness in our parts catalog.  In
fact, from what I can tell, the shim number chart is used only in the
BGB.  It is possible that at one time Toyota supplied a shim set in a
dedicated case with numbered bins for each thickness, but I can't see
any other reference to those numbers.  It may be left over from the
microfiche days.  Perhaps other EPC systems still use it.

At any rate, with our system (Snap-On/ProQuest) it's much easier to just
ask for the thickness (in millimeters, naturally) you need for each
shim.  That is far faster and easier for all concerned than the customer
translating thickness to shim number via the chart, then asking the
parts guy for a shim number, and waiting while the parts guy runs back
to the service department for the BGB so he can dig up the chart and
translate the shim number back to thickness...

Shims are typically a special order part, but Toyota still blesses us
with next-business-day delivery from our nearest warehouse, so the wait
shouldn't be excessive.  And one other note - feel free to swap your old
shims from one valve to another if that gets the lash within spec.  Some
of the old-school wrenches raised on domestic iron are leery of using a
shim against a cam lobe after it's seen another, but in our engines,
it's common practice, and entirely acceptable.


On Fri, 01 Jan 2010 19:09:45 +0000, "Kurt Krueger" <telek2 at att.net>
said:

> Also in the BGB is a chart of shim number vs. thickness.  Something
> you'll need if you have to order a shim.  MkI shims are pretty
> much a special order only item,  MkII possibly the same or
> getting close.

-- 
Aaron Willis - '85 AW11 7A-GE, MSnS-Extra, E85, etc
Club discount on OEM Toyota parts - email me at work! awillis at lithia.com