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

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.

• Disconnect the driveline and remove the transmission. Refer to the OEM service manual.
• Remove the clutch. Refer to the OEM service manual.
• Remove the flywheel. Refer to Procedure 016-005 in Section 16.

The rear crankshaft seal requires the rear crankshaft seal replacer kit, Part Number 3164780, for the seal removal and installation.

1. Replacer plate
2. Pilot drill
3. Replacer screw
4. Self-tapping screw x 10
5. Stud x 3
6. Hex nut x 3.

Use three flywheel mounting capscrews to secure the replacer plate (1) to the crankshaft.

NOTE: Three stud screws (5) and three hex nuts (6) are required for some engines with flywheel mounting capscrews that are too short to mount the replacer plate (1) to the crankshaft.

Install a pilot drill (2) into one of the holes in the rear crankshaft seal tool and drill a hole through the seal casing.

Remove the pilot drill (2) and repeat the procedure for at least two more evenly spaced holes of the rear crankshaft seal tool. As many as six holes may be drilled to assist in removing the rear crankshaft seal.

NOTE: Three guide pins, Part Number 3164765, are required on rear engine power take-off (REPTO) applications to support the REPTO crankshaft gear and the replacer plate.

Install at least three self-tapping screws (1) into the replacer plate (2).

Remove the flywheel capscrews from the rear crankshaft seal tool.

Install the replacer screw (3) into the center hole of the replacer plate and turn the screw clockwise to remove the seal.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.

Clean the seal bore surface of the flywheel housing.

Use an emery cloth to remove any rust or other deposits from the crankshaft flange.

Use a clean, lint-free cloth to clean the crankshaft flange and to remove all traces of oil film.

Visible scratches can result in seal leakage.

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.

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 flywheel. Refer to Procedure 016-005 in Section 16.
• Install the clutch. Refer to the OEM service manual.
• Install the transmission and driveline. Refer to the OEM service manual.
• Operate the engine until it reaches normal operating temperature and check for leaks.