Cummins ISX11.9 CM2250 – Service Manual 001-024   Crankshaft Seal, Rear

The rear crankshaft seal must be oriented with the engine as shown in the illustration.

CAUTION  Never use a hammer or mallet to install the seal. Damage to the seal can occur.

Do not use oil based lubricants to install the seal. Generously apply a water based lubricant, such as P-80, Part Number 3163086, or a 10 percent soap/90 percent water solution, to the outer-ribbed surface of the seal.

Guide the rear crankshaft seal (1), spacer (2), and replacer plate (3) over the crankshaft.

NOTE: Spacer, Part Number 4918688, is used to make sure of the correct installation depth of the crankshaft seal. The flat side of the spacer should contact the crankshaft seal during installation.

NOTE: Three guide pins, Part Number 3164765, are required on REPTO applications to support the REPTO crankshaft gear and the replacer plate.

CAUTION  The rear crankshaft seal must be pressed evenly into the bore. Misalignment of the seal can cause damage.

Install three flywheel mounting capscrews or replacer screws and hex nuts through the replacer plate and into the end of the crankshaft.

NOTE: Three stud screws and three hex nuts, included in the replacer kit, are required for some engines with flywheel mounting capscrews that are too short to mount the replacer plate (1) to the crankshaft.

Finger-tighten the three installation capscrews against the replacer plate.

Tighten the screws not more than ½ of a turn at a time, in a clockwise pattern, until the installation tool seats against the flywheel housing.

Tighten the screws.

Remove the replacer plate and spacer.

Measure the protrusion of the outer rubber portion (A) of the seal relative to the inner metal portion of the seal (B).

Set the dial indicator to ‘0’ (zero) on the inner metal portion of the seal.

Measure and record the protrusion of the outer rubber portion of the seal. Repeat the measurement in four locations equally spaced around the crankshaft seal.

The protrusion measurement at each location must be within +/- 1 mm [+/- 0.04 in]. The difference between any of the four protrusion measurements must be within +/-0.5 mm [0.02in]. If either of these conditions are not met, the rear crankshaft seal must be removed and a new seal installed.