3512C Engine for Caterpillar Built Machines Caterpillar


Camshaft - Install

Usage:

3512C B7F

Installation Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
238-9586  Camshaft Drive Group 
125-0200  Camshaft Pilot As 
125-0201  Camshaft Guide As 
8T-3169  Crank As 


NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.


  1. The following steps are for the installation of a camshaft in the 3512C Engines. The camshaft is in two pieces.

      Note: Ensure that the camshafts are assembled and installed according to the marks on the ends of the camshafts.



      Illustration 1g01053512

    1. Install Tooling (D) on the flywheel housing. Do not tighten the bolts on Tooling (D).

    2. Install Tooling (C) on the end of the front half of the camshaft.

    3. Ensure that the camshaft and the camshaft bearings are clean. Place clean engine oil on the lobes and the journals of the camshaft. Also place clean engine oil on the camshaft bearings.

    4. Attach a suitable lifting device to the camshaft. The weight of one-half of the camshaft for 3512C Engines is approximately 36 kg (80 lb).

    5. Position the front half of camshaft (12) in the engine until Tooling (C) is in the first camshaft bearing.

    6. Rotate camshaft (12) and tighten the bolts for Tooling (D).

    7. Rotate camshaft (12) and insert the camshaft until the camshaft is slightly protruding from Tooling (D).


      Illustration 2g00914670


      Illustration 3g00914462

    8. If the dowel was removed from the front half of camshaft (12), install the dowel. Install the dowel to 22 ± 0.5 mm (0.9 ± 0.02 inch) from the surface of the camshaft.

    9. Attach a suitable lifting device to rear half of camshaft (13). The weight of one-half of the camshaft for 3512C Engines is approximately 36 kg (80 lb). Install spacer (15) and the rear half of camshaft (13) onto the front half of camshaft (12). Install bolts (14) and tighten to a torque of 55 ± 7 N·m (41 ± 5 lb ft).

    10. Install Tooling (C) and Tooling (E) on the rear half of camshaft (13).

    11. Rotate the rear half of camshaft (13) and insert the camshaft into the engine.

    12. Remove all Tooling. Repeat Steps 1.a through 1.k for the camshaft on the opposite side of the engine.


    Illustration 4g00914691

  2. Install thrust washers (10) and bolts (9) that fasten the camshaft to the engine.


    NOTICE

    If the camshaft is out of time more than 18 degrees (approximately 1/2 of the timing pin is out of the groove), the valves can make contact with the pistons. This will cause damage to the engine. Refer to Testing and Adjusting, "Camshaft Timing" for more information.




    Illustration 5g00914693

  3. Remove timing pin (16) from the storage position on the side of the engine.

  4. Turn the camshaft until timing pin (16) can be installed through the cylinder block and into groove (17) that is in the camshaft.

  5. Repeat Steps 3 and 4 for the camshaft on the opposite side of the engine.


    Illustration 6g00914707


    Illustration 7g01053668

  6. Remove bolts (19), cover (18), and plug (20).

  7. Install one bolt (19) into the flywheel housing through the hole for plug (20). Use Tooling (A) and a ratchet to turn the flywheel until bolt (19) can be installed through the hole and into the flywheel. Doing so will position the No. 1 cylinder at the top center. Refer to Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston" for more information.


    Illustration 8g00914726


    Illustration 9g00914728


    Illustration 10g01053357

  8. Use the following procedure in order to install camshaft drive gears (8).

    1. Clean the taper of the camshaft and the tapered bore of the camshaft gear with a lint free cloth saturated with solvent to remove oil. Clean the parts again with a lint free alcohol wipe in order to remove any residue. The alcohol wipe will dirty after cleaning the parts. Clean the parts again with a lint free alcohol wipe until no residue is left on the alcohol wipe.

      Note: The taper of the camshaft and the tapered bore of the camshaft gear must be clean, dry, and free of residue before assembly.

    2. Ensure that the camshaft timing pins and the timing pin for the flywheel are installed.

    3. Place camshaft drive gears (8) in position. Remove the backlash by rotating the gears in the opposite direction of camshaft rotation.

      Note: For "Standard Rotation" engines, turn the camshaft drive gears COUNTERCLOCKWISE. For "Reverse Rotation" engines, turn the camshaft drive gears CLOCKWISE.

    4. Install the bolt and plate (7).

    5. Install the bolt and timing ring (11). Ensure that the hole in the timing ring is properly seated on the locating pin.

    6. Tighten the bolt to a torque of 360 N·m (265 lb ft).

    7. Place a Mark on the bolt.

    8. Place a driver against the retaining plate of the camshaft gear. Strike the driver solidly with a hammer 3 to 4 times.

    9. Tighten the bolt again to a torque of 360 N·m (265 lb ft).

    10. Repeat Steps 8.h and 8.i until the Mark has turned at least 90 degrees.


    Illustration 11g01053666

  9. Remove the timing pins from the camshafts. Install timing pins (16) in the original locations.


    Illustration 12g01053366

  10. Install the gaskets and covers (6) over the camshaft drive gears on both sides of the engine.


    Illustration 13g01053668


    Illustration 14g00914707

  11. Remove bolt (19) from the flywheel. Install plug (20) in the timing hole. Remove Tooling (A) and install cover (18) with bolts (19) on the flywheel housing.


    Illustration 15g00914348

  12. Install covers (4) on the front housing.


    Illustration 16g01053356

  13. Remove the O-ring seals from valve lifters (5). Push valve lifters (5) against the camshaft.


    Illustration 17g01007161

  14. Position covers (2) and install bolts (3) on both sides of the engine.

  15. Install tube assemblies (1).

End By:

  1. Install the electronic control module. Refer to Disassembly and Assembly, "Electronic Control Module (Engine) - Remove and Install".

  2. Install the engine speed/timing sensor. Refer to Disassembly and Assembly, "Engine Speed/Timing Sensor - Remove and Install".

  3. Install the valve mechanism cover base. Refer to Disassembly and Assembly, "Valve Mechanism Cover Base - Remove and Install".

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