Hi Steve,
A few months ago, Chip Old posted some wisdom on this list about those
shims under the rocker posts. He said, essentially, to remove them since
they were put in on the recommendation of the factory, but the factory
was wrong.
As he explained it, the wear on TD valves and guides caused by side
pressure happens because the geometry of the valve stems and the rockers
is not 90 degrees when the valve is half way down. In theory, that's
where it should be to minimise sideways pressure. When the heads were
milled, we put in the shims to "compensate" for the removed metal. He
says that doing so actually made the angle worse, suggested that one look
at the valve action and see.
I need to do just that. There are shims under my rocker posts also.
Bob
On Wed, 15 Oct 1997 10:19:59 -0400 Steven Tritle <stritle@epix.net>
writes:
>JMerz140@aol.com wrote:
>>
>> Steve,
>> There are only four brackets on the XPAG engine of your TD. Once
>the eight
>> bolts are removed, the whole assembly simply lifts off the head.
>Torque
>> value for the 10mm bolts is 43 ft/lb and for the 8mm, its 29 ft/lbs.
> In most
>> cases, you'll probably need a set of four keepers to hold the bolts
>in place
>> after the torque is set. The old ones may be salvable but many
>times the
>> tabs are ready to break off from too much bending.
>> Make sure you lay the parts out in order to reassemble in the exact
>order of
>> disassembly. Especially the shaft. It has an oil hole at the rear
>bracket
>> to pass the oil under pressure to lubricate the whole rocker set-up.
> If it
>> gets in bass-ackwards...
>> no oil and there goes the rocker bushings. Jim
>There are homemade shims under the rocker brackets of my TD's shaft
>assembly. I am replacing one cracked bracket. The four brackets all
>have
>"22914 stamped on them and my new one does not. The size etc. seems to
>be OK. Should I be wary?
>
>Everything else seems to be in order.
>
>Steve
>52 TD
>
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