General Information
Lip Seal
Front gear train engines use a lip style front crankshaft seal (shown) in which the rotating portion of the sealing
occurs at the contact surface between the lip of the seal and the crankshaft.
Always replace the front crankshaft seal with the same style seal as was previously installed.
Unitized Seal
The engine uses a dual or non-lip style seal which utilizes a built in wear sleeve and a concealed sealing lip. The
inner and out diameter are press-fit onto the crankshaft and the front gear cover respectively, requiring service
tool, Part Number 3164659, to remove and install. The sealing point is internal to the seal.
Always replace the front crankshaft seal with the same style seal as was previously installed.
Remove
Front Gear Train
Support the front gear cover on a flat work surface with wooden blocks. Use a suitable punch and hammer to drive
the old seal out of the front gear cover from the back side of the cover to the front side.
NOTE: Some engines can have an additional dust seal installed in front of the front crankshaft seal.
Rear Gear Train
Use tool, Part Number 3164659, to remove the front crankshaft seal from the front gear cover.
Mount the replacer screw assembly (1) onto the crankshaft nose.
Install the two M 12 x 1.25 x 60-mm socket head capscrews (3).
Lubricate the replacer screw with anti-seize or a suitable grease.
Hold the replacer screw and install the crankshaft seal replacer (2) onto the replacer screw assembly. Advance
the crankshaft seal replacer toward the seal by rotating it clockwise until it is positioned against the front gear cover.
Service Tip: Because of space restrictions, it may be necessary to use a compact right angle drill. Also, it may
be necessary to shorten the drill bit used to drill the sheet metal screw holes.
NOTE: The flange of the crankshaft seal replacer is 8 mm [0.32 in] thick.
Mark the drill to a depth of 18 mm [0. 71 in] with tape for drill depth control and apply grease to the drill to catch the
chips. Stop frequently to remove the chips.
With the crankshaft seal replacer positioned against the front gear cover, drill one hole 10 mm [0.39 in] deep. Make
sure the marking tape has not moved from the original position.
Install one sheet metal screw (4) into the seal to hold the crankshaft seal replacer in position.
Drill five additional holes 10 mm [0.39 in] deep and install the additional five sheet metal screws.
NOTE: Make sure all six sheet metal screws are threaded through both the inner and outer seal casings. The sheet
metal screws need to be uniformly tightened in order to pull out the inner and outer casings of the seal together.
Slowly rotate the replacer screw clockwise until the seal is removed. Do not exceed torque value.
Torque Value: 33 Nโขm [ 24 ft-lb ]
NOTE: If the sheet metal screws pull out of the seal or only the inner casing pulls out, stop the removal
operation. Rotate the replacer screw counterclockwise to force the inner casing back. Remove the sheet metal
screws, slightly reorient the tool, drill new holes, and install the sheet metal screws in the new locations.
Complete the removal procedure, remove the tool, and discard the old seal.
Clean and Inspect for Reuse
Use solvent to clean the oil and seal residue from the crankshaft surface.
Dry with compressed air.
For front gear train engines, use a gasket scraper or abrasive pad, Part Number 3823258 or equivalent, to
remove all sealant on the front gear cover and front gear housing.
Clean the gasket sealing surfaces and the surface between the oil seal and front gear cover.
Use solvent to clean the front gear cover.
Clean the front gear cover seal bore of any seal residue.
Inspect the front gear cover seal bore for nicks or burrs.
Use an abrasive pad, Part Number 3823258 or equivalent, to remove any minor damage.
Dry with compressed air.
Inspect the nose of the crankshaft for excessive wear.
Use a fine crocus cloth to remove any nicks or burrs. No wear sleeve is available if the crankshaft nose sealing
surface is damaged.
Install
Front Gear Train
Leave the plastic pilot installation tool in the front crankshaft seal.
Position the seal on the seal installation tool, Part Number 3824498, with the seal dust lip facing outward .
Apply a bead of sealant, Part Number 3824498, to the outside circumference of the seal.
Press the lubricating oil seal into the front cover from the backside of the cover toward the front side of the cover.
Press the lubricating oil seal until the oil seal installation tool, Part Number 3824498, bottoms against the front cover.
NOTE: Each front crankshaft seal kit comes with an installation tool. This tool can be used in place of front
crankshaft seal installation tool, Part Number 3824498, if not available. Use a mallet to tap around the installation
tool to drive the front crankshaft seal into the front gear cover until the installation tool bottoms against the front
gear cover.
The seal lip and the sealing surface on the crankshaft must be free from all oil residue to prevent seal leaks.
Apply a thin bead of sealant, Part Number 3164070, to the sealing surface of the front cover.
NOTE: Do not remove the plastic seal pilot tool from the front crankshaft seal at this time. Use the plastic seal pilot
tool to guide the seal on the crankshaft.
NOTE: Install the front cover within 10 minutes of applying the sealant, or the sealant will not seal correctly. Once
installed, allow the sealant to dry for 30 minutes before operating the engine.
Install the front gear cover on the engine, using the plastic seal pilot tool to guide the front crankshaft seal onto the
crankshaft.
After the gear cover capscrews are installed and tightened, remove the plastic pilot tool from the crankshaft.
If previously equipped or if the engine operates in a dusty environment, install a dust seal.
A pilot tool is not necessary for the dust seal. Slide the dust seal over the nose of the crankshaft.
Use the installation tool that came with the new front crankshaft seal to install the dust seal into the front gear
cover. Install the dust seal until it is even with the front gear cover.
Rear Gear Train
Use tool, Part Number 3164659, to install the oil seal into the front gear cover.
Mount the replacer screw assembly (1) onto the crankshaft nose.
Install the two M12 x 1.25 x 60 mm socket head capscrews (3).
Place the new front crankshaft seal over the crankshaft nose and slide it by hand toward the front gear cover as
tar as possible.
NOTE: Make sure the seal is positioned square with the crankshaft.
While holding the replacer screw, install the crankshaft
seal replacer (2) onto the replacer screw assembly.
Advance the crankshaft seal replacer toward the seal by rotating it clockwise until it is positioned against the seal.
While holding the crankshaft seal replacer, rotate the replacer screw counterclockwise until the crankshaft
seal replacer contacts the front gear cover.
Remove the service tools.
