2003/03/01 Caterpillar

Engine:

3406C (S/N: 1SS1-UP)

3406E (S/N: 9WR1-UP)

3408 (S/N: 99U1-4588)

3408B (S/N: 99U4589-7598)

3408C (S/N: 1TS1-UP)

3408C (S/N: 99U7599-UP)

3412 (S/N: 7BL1-UP)

3412 (S/N: 60M1-5160)

3412C (S/N: 60M5161-UP)

3412C (S/N: 9BR1-UP)

3412E (S/N: 9KS1-UP; 9PW1-UP)

C18 (S/N: CKH1-UP)

C30 (S/N: CLX1-UP)

Description of Change: A new crankshaft front seal is now available. The new seal incorporates both the seal and the wear sleeve together. The new crankshaft front seal has a redesigned wear sleeve that has a flanged face. This new flanged face rotates with the crankshaft in order to keep dirt away from the sealing lip. This will provide better control of contaminants.

The removal procedure of the new seal has been changed because of the new flanged face on the wear sleeve. The seal face is blocked by the new flanged face on the wear sleeve.

Adaptable To: The new crankshaft front seal is adaptable to all 3400 engine models. The new crankshaft front seal is a direct replacement for either of the former seals. Refer to the 1 table below.

Removal Procedure

Illustration 1	g00829143
New seal (1) Seal (2) Flange of the wear sleeve (3) Wear sleeve

1. Use a hammer and a punch in order to puncture three or more holes in the wear sleeve (3) on the flange of the wear sleeve (2). Use Tool (A) to remove the wear sleeve (3) .

2. Use a punch or Tool (A) to puncture a hole in seal (1). Use Tool (A) to remove seal (1) .

Installation Procedure

Note: The front seal and the wear sleeve must be replaced at the same time. Once the seal and the wear sleeve are separated, these components cannot be used again. Refer to Special Instruction, SMHS8508, "Special Handling Information and Installation Instructions for Crankshaft Seal Groups That Have Hydrodynamic Grooves In the Sealing Lip" before the seal is serviced.

Note: Do not use any type of lubricant during the installation of the crankshaft seal and the wear sleeve.

1. Before installation of the crankshaft seal and the wear sleeve, inspect the crankshaft for scratches. Also, inspect the crankshaft for any distortion on the surface that may lead to an out of round condition. Use a polishing cloth in order to remove any imperfections on the crankshaft.

2. Use 4C-9500 Quick Cure Primer to clean the outside diameter of the crankshaft.

Show/hide table



Illustration 2	g00829143
New seal (1) Seal (2) Flange of the wear sleeve (3) Wear sleeve

3. Fasten Tool (A) to the crankshaft with Tool (B) .

Show/hide table

NOTICE
The front and rear seals and wear sleeves have different spiral grooves in the seal. Because of this type of design, the front seal group for an engine is different from the rear seal group. If a seal group is installed on the wrong end of the engine, oil can actually be taken out of the engine instead of moving oil back into the engine.

Show/hide table



Illustration 3	g00829675
Typical example

Show/hide table



Illustration 4	g00515623
Typical crankshaft

Note: Install the seal with the arrow that shows the direction of crankshaft rotation toward the front of the engine.

4. Position wear sleeve (3) and seal (1) on Tool (A). Install Tool (D) on Tool (A). Lubricate the face of the washer on Tool (C). Install Tool (C) on Tool (A) .

5. Tighten Tool (C) until Tool (D) contacts Tool (A) .

6. Remove Tools (A), (B), (C), and (D). Check the crankshaft seal and the wear sleeve for the correct installation.