Mack ASET AC - Crankshaft Rear Oil Seal Installation

REPAIR INSTRUCTIONS, PART 1
Page 301
341
Figure 341 — Flywheel Housing Runout Check with Dial
Indicator
Crankshaft Rear Oil Seal Installation
[212 JH]
MACK engines with dry flywheel housings
(standard transmission) use single-lip seals,
while those with wet flywheel housings (automatic
transmission) use double-lip seals. The single-lip
replacement seals are available in either Viton or
Teflon
®
while the double-lip replacement seals
are available in Teflon
®
only. The single-lip Viton
seals have an oversized inside diameter and are
supplied with a corresponding wear ring.
INSTALLATION — SINGLE-LIP SEAL
Crankshaft design allows the single-lip seal to be
installed at the production depth of 0.344 inch ±
0.005 inch (8.74 mm ± 0.127 mm), or a service
depth of 0.250 inch ± 0.005 inch (6.35 mm ±
0.127 mm) from the rear outer edge of the
crankshaft flange.
Special handling precautions must be taken while
installing Teflon
®
seals. Do not lubricate the lips
of a Teflon seal before installation. Teflon
®
seals
function most effectively when installed dry.
Standard-size Teflon
®
seals are shipped on a
plastic installation sleeve. Do not remove the seal
from the sleeve before installation. The
installation sleeve provides a smooth surface for
the seal as it moves from the tool to the
crankshaft flange.
1. Thoroughly clean the surface of the
crankshaft flange.
2. Position the oil seal and installation sleeve
onto the recessed side of the J 37716-B oil
seal installation tool adapter plate as shown
in Figure 342. The single-lip seal must be
installed with the lip toward the engine.
342
Figure 342 — Crankshaft Rear Oil Seal Installation
1. J 37716-B
2. Oil Seal
3. Installation Sleeve
5-111.bk Page 301 Monday, July 10, 2006 2:26 PM