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

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.