REPAIR INSTRUCTIONS, PART 2
Page 383
앫 On engines equipped with a J-Tech™
engine brake, new actuating pin adjusting
screw assemblies were implemented into
production. These new assemblies feature a
XADC-ARMOLOY
®
coating on the bottom
pin seat area of the screw body and on the
entire surface of the floating pin. This
coating provides a more durable seat area
for the actuating pin. This coating gives a the
pin seat area and the bottom side of the first
thread a dull aluminum color. If the existing
actuating pin adjusting screw assemblies
are not the XADC-ARMOLOY
®
coated type,
replace with new screw assemblies.
앫 On J-Tech™ equipped engines that exhibit
worn actuating pin adjusting screws, broken
exhaust valve yoke guide pins and broken
rotator springs, the possibility exists that the
engine brake slave pistons may also be
broken. The slave piston springs should be
removed and inspected as outlined in
service bulletin SB-213-027, and replaced
as required. A parts kit (part No. 215SB321)
that contains new design reset screws, slave
piston springs and the actuating pin
adjusting screws with the
XADC-ARMOLOY
®
coating is available
through the MACK Parts System to update
the engine brake units with new and
improved component. Always verify that the
engine is not already equipped with these
new components.
456
Figure 456 — J-Tech™ Exhaust Valve Adjusting Screw
Dimensions
5-111.bk Page 383 Monday, July 10, 2006 2:26 PM
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