Crankshaft Rear Oil Seal Replacement

TM 9-2320-363-34-1 · Chapter 3 — Power Package Maintenance

This task covers: a. Removal b. Inspection c. Installation

Tools and Special Equipment:                    Materials/Parts:
Shop Equipment, SC 4910-95-CL-A31               Seal                   P/N 8929750
Tool Kit, SC 5180-90-CL-N05
Oil Seal Remover, J35993                        Oil, Lubricating       Appendix B, Item 37
Oil Seal Expander, J35685-A                     Cloth, Abrasive        Appendix B, Item 10
Oil Seal Installer, J35686
                                                Equipment Condition:
                                                Reference              Condition Description
                                                Page 3-154             Flex Plate Removed

                                             NOTE
      If oil seal remover screws strip out of oil seal casing, remove screws and bolts.
      Rotate oil seal remover 1/2 the distance between existing screw holes in seal
      casing and repeat steps 1 thru 4.

1.   POSITION OIL SEAL REMOVER (1) OVER REAR OF CRANKSHAFT AGAINST FLYWHEEL
     HOUSING (2).
                                             NOTE
      Oil seal remover screws must be evenly snug against oil seal remover but not
      overtightened and stripped in oil seal casing.

2.   INSTALL SIX OIL SEAL REMOVER SCREWS (3) THRU INNER CIRCLE OF HOLES IN OIL SEAL
     REMOVER (1) AND INTO OIL SEAL CASING.
3.   THREAD THREE BOLTS (4) INTO OUTER CIRCLE OF HOLES IN OIL SEAL REMOVER (1) UNTIL
     BOLTS CONTACT FLYWHEEL HOUSING (2).
4.   WORKING CLOCKWISE, TURN EACH BOLT (4) ONE FULL TURN UNTIL CRANKSHAFT REAR OIL
     SEAL IS REMOVED.

Minor wear line on crankshaft surface should be evident where contact was made with oil seal. This is normal.

1. INSPECT OIL SEAL CONTACT SURFACE OF CRANKSHAFT CAREFULLY.

2. INSPECT EXPOSED AREA OF CRANKSHAFT FOR DIRT, BURRS, OR ROUGH SURFACES.

3. IF NECESSARY, CLEAN/SMOOTH CRANKSHAFT SURFACE WITH ABRASIVE CLOTH.

4. MAXIMUM RUNOUTOF OIL SEAL BORE IN FLYWHEEL HOUSING 1S 0.013 IN. (0.330 mm). BORE MAY BE CHECKED WITH DIAL INDICATOR MOUNTED ON END OF CRANKSHAFT. THIS CHECK MUST BE MADE WITH FLYWHEEL HOUSING COVER IN PLACE ON ENGINE AND OIL SEAL REMOVED.

1. COAT OUTSIDE OF OIL SEAL EXPANDER (1) WITH LIGHT FILM OF CLEAN ENGINE LUBRICATING OIL AND INSTALL OIL SEAL EXPANDER (1) ON END OF CRANKSHAFT (2).

Keep sealing lip of crankshaft rear oil seal free of dirt and scratches. Do not clean or coat rear oil seal with oil to prevent damage to equipment.

2. INSTALL CRANKSHAFT REAR OIL SEAL (3) CAREFULLY OVER OIL SEAL EXPANDER (1) AND ONTO CRANKSHAFT (2) AS FAR AS OIL SEAL WILL GO BY HAND.

3. REMOVE OIL SEAL EXPANDER (1).

4. POSITION OIL SEAL INSTALLER BASE (4) ON REAR OF CRANKSHAFT (2).

5. INSTALL TWO GUIDE STUDS (5) IN TWO FLYWHEEL BOLT HOLES 180 DEGREES APART.

6. HAND-TIGHTEN TWO GUIDE STUDS (5) UNTIL INSTALLER BASE (4) IS TIGHT AGAINST REAR OF CRANKSHAFT (2).

7. INSTALL OIL SEAL INSTALLER SPACER (6) ON CENTER SCREW (7).

8. PLACE OIL SEAL INSTALLER HOUSING (8) OVER CENTER SCREW (7) AND TWO GUIDE STUDS (5) AND POSITION HOUSING (8) AGAINST CRANKSHAFT REAR OIL SEAL.

9. INSTALL THRUST BEARING (9) ON CENTER SCREW (7) WITH LETTERED SIDE OF BEARING (9) AGAINST OIL SEAL INSTALLER HOUSING (8).

10. INSTALL NUT (10) ON CENTER SCREW (7). TIGHTEN NUT UNTIL CRANKSHAFT REAR OIL SEAL IS FIRMLY SEATED.

11. REMOVE OIL SEAL INSTALLER NUT (10), THRUST BEARING (9), INSTALLER HOUSING (8), SPACER (6), GUIDE STUDS (5), AND INSTALLER BASE (4).