N14 Base Engine Troubleshooting and Repair Manual – 001-023   Crankshaft Seal, Front

• Remove the alternator drive belts. Refer to Procedure 013-005 in Section 13.
• Remove the vibration damper. Refer to Procedure 001-052 in Section 1.
• Remove the crankshaft pulley. Refer to Procedure 001-022 in Section 1.
• Remove the dust excluder from the front of the seal.

The front crankshaft seal requires the Crankshaft Seal Replacer Kit, Part Number 4919704, for seal removal and installation.

• Use three of the damper mounting capscrews to secure the top plate, Part Number ST-1259-1 (from oil seal puller/installer, Part Number 4919704), to the front of the crankshaft.
• Install the drill pilot, Part Number 3375496, into one of the 1/4-inch holes in the top plate, Part Number ST-1259-1.

• Insert a Number 31 [0.120-inch] drill bit into the drill pilot, and drill a hole through the seal casing.
• Remove the drill pilot, and repeat the same procedure in the two remaining holes in top plate, Part Number ST-1259-1.

• Install three seal puller screws, Part Number ST-1259-6, into the plate. Tighten the screws until the shoulder on the screw contacts the seal casing.
• Remove the three damper mounting capscrews from the puller plate.

• Install the center puller screw in the plate. Continue to turn the center screw clockwise until the seal is removed from the gear cover.

• Use a magnet to remove any shavings from the seal bore or the crankshaft.
• Use a crocus cloth to polish and remove any deposits from the crankshaft or the seal bore. Visible scratches on the sealing surface can result in seal leakage.
• Use a clean cloth and a safety solvent, Part Number 3823717 or equivalent, to clean the crankshaft flange and the seal bore and to remove all traces of oil film.

• Mount a dial indicator onto the front of the crankshaft. Check the concentricity of the seal bore. The total indicator reading must not exceed 0.38 mm [0.015-inch].
• If the reading exceeds 0.38 mm [0.015-inch], remove the gear cover and check for burrs between the mounting surfaces, damaged dowel pins, or damaged dowel holes. Refer to Procedure 001-031.
• Inspect the crankshaft for worn grooves in the sealing area.
• If the wear depth of the groove is less than 0.127 mm [0.005 in] a replacement seal with no wear sleeve may be used if the seal can be installed past the grooved area without scratching the sealing lip.
• If wear is between 0.127 to 0.762 mm [0.005 to 0.030 in] use of a wear sleeve is required.
• If wear is in excess of 0.762 mm [0.030 in] the crankshaft must be replaced, or reconditioned prior to use.

NOTE: “LDL TFE” (Lay-Down Lip, Teflon™) oil seals for service replacement have an assembly tool which protects the seal lip during shipment and installation. The “LDL TFE” oil seal

must be installed with the lip of the seal and the crankshaft clean and dry. Do not use any lubricant. The use of lubricant will result in oil leakage at the seal.

• The installation procedure for the crankshaft oil seal varies when used with or without a wear sleeve.

Seal (No Wear Sleeve) Installation

• A seal without a wear sleeve may be used on new crankshafts, or used crankshafts having wear grooves less than 0.005″ deep.
• Use the installation sleeve provided with the seal to install the seal partially onto the crankshaft.
• After installing the oil seal onto the installation sleeve, fit the sleeve over the nose of the crankshaft. Use hand pressure to transfer the oil seal over the installation sleeve onto the crankshaft as far as possible.
• Remove the installation sleeve from the nose of the crankshaft.

• Install the included 3/16 inch spacer ring, Part Number 4919687, onto the top plate, Part Number ST-1259-1, with the three allen head screws, Part Number ST-1259-3, provided.
• Install the top plate, Part Number ST-1259, (with a 3/16 inch spacer mounted) to the crankshaft, using three vibration damper mounting capscrews and flat washers.
• Tighten the three capscrews alternately in 1/2-turn increments until the oil seal is installed flush with the gear cover bore.

Seal (with Wear Sleeve) Installation

• Install the included 3/16 spacer, Part Number 4919687, onto the top plate, Part Number ST-1259-1. Use the three allen head screws provided, Part Number ST-1259-3.
• Install the wear sleeve onto the seal using the plastic guide that is provided in the seal kit.
• Apply a thin layer of sealant, such as Dow™ 736 or equivalent, to the wear sleeve and to the crankshaft where the wear sleeve will seat.

• Fit the top plate (with spacer) and the seal (with wear sleeve) to the crankshaft using three included capscrews, Part Number S-123-A, and flat washers.

NOTE: Make sure the wear sleeve and seal are even before starting installation or damage to the wear sleeve can occur.

• Tighten the three capscrews alternately in half turn increments until the oil seal is installed flush with the gear cover bore.
• Clean any excess sealant from the crankshaft and seal.

• Measure the squareness of the installed seal.
• Set the dial indicator to zero on the inner metal portion of the seal.
• Measure four locations equally spaced around the crankshaft seal.
• The difference between any of the four protrusion measurements must not exceed ± 0.3 mm [0.012 in].
• If this condition is not met, the front crankshaft seal must be removed and a new seal installed.

• Install the dust excluder seal by hand, flush to +0.38 mm [+0.015 inch] from the case of the oil seal.

NOTE: The dust excluder must
be installed dry. Do

not use any lubricant.

• Install the crankshaft pulley. Refer to Procedure 001-022 in Section 1.
• Install the the vibration damper. Refer to Procedure 001-052 in Section 1.
• Install and adjust the alternator drive belts. Refer to Procedure 013-005 in Section 13.