Centinel System – Repair Manual – 001-023   Crankshaft Seal, Front

WARNING  This component or assembly weighs greater than 23 kg [50 lb]. To prevent serious personal injury, be sure to have assistance or use appropriate lifting equipment to lift this component or assembly.

• Remove the fan and water pump drive belt. Refer to Procedure 008-003 (Drive Belt, Water Pump) in Section 8.
• Remove the fan and water pump belt tensioner. Refer to Procedure 008-080 (Belt Tensioner, Automatic (Water Pump) in Section 8.
• Remove the crankshaft pulley and vibration damper(s). Refer to Procedure 001-052 (Vibration Damper, Viscous) in Section 1.

Remove the eight mounting nuts from the gear cover studs.

Position the replacer plate (1) over the crankshaft end and against the crankshaft seal. The large notch between the teeth needs to bridge the raised gear cover surface.

Make certain that the alignment of the three welded nuts on the crankshaft seal are positioned into the counterbore slots of the replacer plate (1).

Install a capscrew (4) with a flat washer (5) in the upper slot of the replacer plate to hold it in position

CAUTION  Tighten the capscrews by hand until a slight resistance is felt. Do not overtighten the capscrews or the seal nuts can break off causing damage to the seal and leading to front cover damage.

Use a small allen wrench to thread the removal tool capscrews (2) through the replacer plate and into the seal nuts.

Tighten the socket head capscrews (2)
clockwise into the three seal removal nuts that are welded on the crankshaft seal until a slight resistance is felt.

Remove the capscrew in the upper slot of the replacer plate (1).

Install the replacer screw (3) into the replacer plate (1).

Turn the screw (3)
clockwise until the crankshaft seal is removed from the crankshaft.

NOTE: All lower gear covers have either a beveled half groove, or a full o-ring groove under the crankshaft seal flange.

Full o-ring groove covers contain an o-ring in the lower gear cover groove and were only used prior to June 5, 1999. The lower gear cover
must be replaced if installing a new seal.
Refer to Procedure 001-080 (Gear Cover, Lower).

Beveled half groove covers do
not contain an o-ring and
only require replacement if damaged.
Refer to Procedure 001-080 (Gear Cover, Lower).

Use a small magnet to remove any metal shavings.

Use a crocus cloth to remove any deposits from the crankshaft and seal bore area.

Inspect the crankshaft for nicks, burrs, and grooves. Damage to the sealing surface can result in seal leakage.

If a fingernail catches in a nick, burr, or groove, the crankshaft
must be replaced.

The position of the front crankshaft seal on the crankshaft is determined by the position of the lower gear cover.

The lower gear cover is mounted to the gear cover housing using clearance holes. This allows for slight movement of the cover when the mounting capscrews are loose.

The unitized crankshaft seal
must be centered on the crankshaft for correct operation.

The seal attaches to the lower gear cover, and
must be installed with the lower gear cover capscrews loose and the cover free to move.

In order for the seal to be properly centered on the crankshaft during assembly and maintain its location during operation, the following installation instructions
must be followed.

The crankshaft seal removal and installation tool correctly centers the seal and correctly positions the dust seal portion of the seal on the crankshaft.

CAUTION  Failure to loosen and remove the mounting capscrews from the gear cover can cause the front crankshaft seal to be misaligned and cause premature seal wear.

The front gear cover
must be aligned as follows:

Removing the gear cover mounting capscrews around the crankshaft seal allows the replacer plate to set against the gear cover during seal installation.

Remove the gear cover mounting capscrews around the crankshaft seal.

Loosen the remaining mounting capscrews on the gear cover so the cover can move freely.

CAUTION  Failure to follow the installation and tightening sequence can lead to the crankshaft seal being off center and installed at the wrong depth causing premature seal wear.

CAUTION  Never use a hammer or mallet to install the seal. Use of a hammer can damage the crankshaft seal and/or crankshaft.

The seal removal and installation tool has provisions for any seal nut orientation, although one seal nut
must always be located at the 11 o’clock position.

Do
not use lubricants on the crankshaft seal.

Position the crankshaft seal (1) onto the crankshaft until the gear cover studs are protruding through the seal carrier mounting holes.

Place the replacer plate (1) against the crankshaft seal.

Make sure the welded nuts on the front crankshaft seal are seated in their respective slots on the replacer plate (1).

The large notch between the teeth
must bridge the raised gear cover surface.

Install three washers (4) and capscrews (5) through the three slots in the replacer plate (1) and into the crankshaft end.

The capscrews in the replacer plate
must be equally spaced. This allows the crankshaft seal to be installed correctly.

Tighten the capscrews hand-tight.

CAUTION  The crankshaft seal must be pressed evenly. If the crankshaft seal is not pressed in evenly the seal can be damaged.

Inspect the crankshaft seal during installation to make certain it is being pressed evenly.

Tighten the capscrew(s) no more than ½ of a revolution at a time, alternating in a
clockwise pattern until the replacer plate (1) bottoms out against the face of the lower gear cover.

To maintain the cover position while the replacer plate is removed, tighten the two gear cover mounting capscrews, as indicated by the arrows in the graphic.

Install the crankshaft seal mounting nuts (1) through the holes provided in the replacer plate.

Tighten the mounting nuts in the sequence shown.

Remove the replacer plate.

Install all the gear cover mounting capscrews.

The torque sequence
must be followed to prevent the gear cover strip seal from squeezing out of the groove.

Tighten the capscrews in the sequence shown.

WARNING  This component or assembly weighs greater than 23 kg [50 lb]. To prevent serious personal injury, be sure to have assistance or use appropriate lifting equipment to lift this component or assembly.

• Install the crankshaft pulley and vibration damper(s). Refer to Procedure 001-052 (Vibration Damper, Viscous) in Section 1.
• Install the fan and water pump belt tensioner. Refer to Procedure 008-080 (Belt Tensioner, Automatic (Water Pump) in Section 8.
• Install the fan and water pump drive belt. Refer to Procedure 008-003 (Drive Belt, Water Pump) in Section 8.