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REPAIR INSTRUCTIONS
Crankshaft Rear Oil Seal Installation
[212 JH]
MACK E-Tech™ engines are produced with
Teflon
®
oil seals. Engines with dry flywheel
housings (standard transmission) use single-lip
seals, while those with wet flywheel housings
(automatic transmission) use double-lip seals.
Single-lip replacement seals are available in
Viton or Teflon
®
; double-lip replacement seals are
available in Teflon
®
only. Viton seals are available
with an oversized inside diameter and the
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 (2) and installation
sleeve (3) onto the recessed side of
J 37716-B oil seal installation tool adapter
plate (1) as shown in Figure 252. The single-
lip seal must be installed with the lip toward
the engine.
252
Figure 252 — Crankshaft Rear Oil Seal Installation
3. Using the three guide pins, attach the
adapter plate to the crankshaft flange. Refer
to Figure 253.
253
Figure 253 — Adapter Plate J 37716-B Installation
4. Determine the seal and wear ring installation
depth:
r
New seal on a new crankshaft or
service crankshaft with a new wear
ring — Install to the initial production
depth of 0.339–0.349 inch
(8.611–8.865 mm).
r
New seal on a service crankshaft with/
without a used wear ring — Install to
the service depth of 0.245–0.255 inch
(6.223–6.477 mm).
r
Wear ring installation depth —
0.15–0.220 inch (5.461–5.588 mm).
Refer to Figure 254.
1. J 37716-B
2. Oil Seal
3. Installation Sleeve
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