G3304 and G3306 Engines Caterpillar

Disassembly Procedure

Start By:

1. Remove the magneto. Refer to Disassembly and Assembly, "Magneto - Remove and Install" for the engine that is being serviced.

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Illustration 1	g00996233

1. Remove screws (1) and the lockwashers that hold cover (2) in place. Carefully remove cover (2). The ground wire is fastened to cover (2).
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   Illustration 2	g00996234

2. Remove screw (3) and disconnect the ground wire from block assembly (4).
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   Illustration 3	g00996235

3. Remove screws (5), the washers and the lockwashers. Remove block assembly (4) from cover (2).
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   Illustration 4	g00996236

4. Remove brushes (6) and the springs from block assembly (4).
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   Illustration 5	g00996237

5. Remove four screws (8) and the lockwashers. Pull end cap (7) away from the housing far enough in order to disconnect the ground wire from the contact points.
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   Illustration 6	g00996239

6. Disconnect grounding wire (9) from the contact points.
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   Illustration 7	g00996241

7. Disconnect grounding wires (9) from end cap (7).

8. Remove cover (10) and the screens from each side of the end cap.
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   Illustration 8	g00996243

9. Remove screw (11), the lockwasher, and distributor disc (12).
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   Illustration 9	g00996244

10. Remove contact points (13) and condenser (14).
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    Illustration 10	g00996246

    Note: Place a mark on cam (15) in order to identify the correct key at assembly.

11. Remove nut (16), cam (15), and the key from the shaft.

12. Remove two screws, the washers, the lockwashers and plate (17) from the bearing support.
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    Illustration 11	g00996250

13. Remove three screws (18) and the lockwashers that hold bearing support (19) in position.
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    Illustration 12	g00996251

14. Install a 1 1/2 inch long 1/4 inch 20 NC forcing screw (20), as shown. Remove bearing support (19) from the housing.
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    Illustration 13	g00996252

15. Use Tooling (A) in order to remove snap ring (21).

16. Use a press in order to remove distributor gear and shaft assembly (22) from the bearing support.
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    Illustration 14	g00996254

17. Loosen screws (24) and wedges (23). Turn rotor shaft (25) until the magnetic field is broken. Remove the screws, the wedges and coil (26) from the housing.
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    Illustration 15	g00996255

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    Personal injury can result from parts and/or covers under spring pressure. Spring force will be released when covers are removed. Be prepared to hold spring loaded covers as the bolts are loosened.

    Note: Care must be taken when coupling shell (28) and the spring are removed. The coupling is under spring force.

18. Turn over the housing and remove nut (27) and the washer from the impulse coupling.

19. Use pliers on one of the drive lugs of coupling shell (28). Turn and pull the coupling at the same time until the spring releases. To make a separation of the coupling from the hub, the spring end must be removed from the groove in the hub.
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    Illustration 16	g00996258

    Note: The coil of spring (30) must be in the correct direction for magneto rotation. The spring must be in a clockwise direction from end (29) in order to rotate the coil counterclockwise.

20. Remove spring (30) from coupling shell (28).
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    Illustration 17	g00996260

21. Remove hub (31) from the shaft.
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    Illustration 18	g00996262

22. Remove key (33) and seal (32). Destroy seal (32) in order to remove the seal.
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    Illustration 19	g00996263

23. Use Tooling (B) in order to remove snap ring (35). Remove pin (34).
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    Illustration 20	g00996264

24. Use a press in order to remove shaft assembly (25) from housing (36).
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    Illustration 21	g00996265

25. Use Tooling (B) in order to remove snap ring (37) that holds bearing (38) in position.
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    Illustration 22	g00996266

26. Use a press in order to remove bearing (38) from housing (36).

27. Remove cover (39) and the screens from each side of housing (36).