REPAIR INSTRUCTIONS
Page 249
Crankshaft Hub Installation
[212 RH]
INSPECTION
Inspect the crankshaft hub for scoring and
condition of the flange and threaded holes.
Replace the hub if the removed seal shows signs
of wear. Mack Trucks, Inc. does not recommend
the use of a service sleeve to repair the
crankshaft hub when there is hub damage. When
there is damage to the hub, replace it.
INSTALLATION PROCEDURE
Refer to Figure 270.
1. Using a suitable grease-type lubricant, coat
the working surface of the seal in
preparation for the crankshaft hub
installation.
Teflon
®
-type seals do not require greasing the
working surface of the seal.
2. Heat the hub to approximately 250
°
F
(121
°
C) prior to installation.
3. Using heat-resistant gloves, position the hub
on the crankshaft.
While the crankshaft has a keyway slot, the
crankshaft hub does not. For the E-Tech™
engine, timing is set in relation to the flywheel
position and not the crankshaft hub, eliminating
the need for a hub key and precise alignment.
4. In a quick, even motion, push the hub onto
the crankshaft.
5. Install the hub washer and capscrew.
Tighten the capscrew to the specified
torque, 330 lb-ft (447 N•m), using torque
wrench J 23775-01, or equivalent.
270
Figure 270 — Crankshaft Hub/Vibration Damper
Vibration Damper Installation
[212 RB]
INSPECTION
When removing or handling the vibration damper,
be careful not to damage the housing. Any dents
in the outer housing may render the damper
ineffective and result in cracks in the crankshaft.
The vibration damper cannot be repaired.
Inspect the vibration damper for dents, nicks or
fluid leaks in the outer housing. If any of the
above are evident, the vibration damper must be
replaced. Due to the close clearances between
the damper housing and its internal flywheel,
dents or nicks may cause contact between the
two components. Fluid loss will deteriorate the
dampening effect of the damper.
1. Crankshaft
2. Crankshaft Hub
3. Vibration Damper
4. Pulley
5. Damper/Puller
Capscrews and Washers
6. Hub Capscrew
5_106_00.bk Page 249 Friday, August 4, 2000 11:17 AM
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