Mack MP7 - Page 304

REPAIR INSTRUCTIONS, PART 3
Page 293
15. If the backlash measurement is out of
specification, adjust the gear flank clearance
as follows:
a. Loosen the J 44514-5 clamp assembly
tool from the adjustable idler gear hub.
b. Loosen the adjustable idler gear hub
screws slightly. Loosening the hub
screws will allow the idler gear to be
moved slightly in/out from the camshaft
gear.
c. Insert a 0.1 mm (0.004 inch) thickness
gauge on the pressure side of the
adjustable idler gear tooth and
camshaft gear tooth by using feeler
gauge holder J 44935 and J 44514-6
feeler gauge.
d. While holding the adjustable idler gear
in against the thickness gauge and
camshaft gear, tighten, but do NOT
torque, the adjustable idler gear hub
fasteners.
e. Reinstall and tighten the J 44514-5
clamp assembly tool against the
adjustable idler gear.
f. Remove the feeler gauge from the
adjustable idler gear and camshaft
gear.
g. Recheck the backlash. With the
specified backlash attained, replace
each adjustable idler gear hub screw
with new and tighten the screws to
specification one at a time so the
attained backlash is not disturbed.
432
Figure 432 — Idler Gear Flank Clearance Adjustment
16. Remove the J 44514-5 clamp assembly tool
from the timing gear plate.
17. Remove the J 44514-1A gauge plate tool
and reinstall the vibration damper and clamp
plate using new fasteners. Torque to
specification.
18. Apply a 2 mm (5/64 inch) bead of
MACK-approved sealant on the timing gear
cover mounting surface and install new
rubber seals (Figure 433).
433
Figure 433 — Timing Cover Seals and Sealant
Application
1. Idler Gear 2. Hub Screws
1. Rubber Seals 2. Sealant