User Manual

200 ENGINE ASSEMBLY
Page 6-33
7. Tighten the hex nut until a positive stop is
felt. At that point, the oil seal and wear ring
are properly installed on the crankshaft
flange.
8. Remove the installation tool.
Figure 6-36 — Crankshaft Wear Ring (with Double-Lip
Teflon Seal) Installation Using J 35529
[212 JH] CRANKSHAFT REAR
OIL SEAL
In November 1992, MACK introduced Teflon oil
seals into E7 production. E7 engines with dry
flywheel housings (standard transmission) use
single-lip seals. Replacement seals are available
in Viton or Teflon. Viton seals are available with
an oversized inside diameter and the wear ring is
installed in the seal. E7 engines with wet flywheel
housings (automatic transmission) use double-lip
seals, which are available in Teflon only.
Installation
Standard-size Teflon seals are shipped on a
plastic installation sleeve. Do not remove the
sleeve from the seal before installation. The
installation sleeve provides a smooth surface for
the seal as it moves from the tool to the
crankshaft flange.
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 outer edge of the
crankshaft flange.
The double-lip seal must be installed to a depth of
0.250 inch ± 0.005 inch (6.35 mm ± 0.127 mm)
only. This is the only installation depth specified
for a double-lip seal.
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.
1. Thoroughly clean the surface of the
crankshaft flange.
2. Position the oil seal (2) and installation
sleeve (3) onto the recessed side of the
J 37716-B oil seal installation tool adapter
plate (1). The single-lip seal must be
installed with the lip toward the engine.
Refer to Figure 6-37.
Figure 6-37 — Crankshaft Rear Oil Seal Installation
3. Using the three guide pins, attach the
adapter plate to the crankshaft flange. Refer
to Figure 6-38.
Figure 6-38 — Adapter Plate J 37716-B Installation
1. J 37716-B
2. Oil seal
3. Installation sleeve
5-101.bk Page 33 Friday, March 17, 2006 11:05 AM