3406E, C-10, C-12, C-15, C-16 Truck Engines Caterpillar

Note: Refer to this Operation and Maintenance Manual, "Severe Service Application - Check" in order to determine the operating conditions for the engine. This maintenance procedure should be completed at the following intervals:

• Every oil change for an engine which operates in a severe service application

• Alternate oil changes (every other oil change) for an engine which operates in normal conditions

Do not perform this maintenance and do not order any parts until the entire instruction has been read and understood.

Follow the procedure that is listed below in order to check the end play of the crankshaft without removing the engine. The current specification for crankshaft end play is 0.1 mm (0.00394 inch) to 0.5 mm (0.01969 inch).

1. Bleed the system pressure from the transmission. This is necessary for an accurate reading of the crankshaft's end play.

   Note: Refer to the transmission manufacturer's instruction manual for more information on this procedure.

2. Place a dial gauge on the end of the crankshaft pulley in order to check the end play. Zero the dial gauge in order to get an accurate reading.

3. Use a prybar and use a wood block to move the crankshaft. The block of wood should be placed between the prybar and the vibration damper. The block of wood is used to protect the vibration damper from getting punctured. Move the crankshaft and observe the dial gauge.

4. Inspect the thrust bearing if the end play is greater than 0.5 mm (0.01969 inch).

5. If the end play is greater than the maximum specification, the 246-3144 Thrust Plate should be replaced.

   Reference: Disassembly and Assembly, "Crankshaft Main Bearings Remove" Disassembly and Assembly, "Crankshaft Main Bearings Install"

6. Use a surface finish comparator in order to determine the reusability. Measure the surface finish. If the surface finish is less than 0.40 RA the crankshaft can be reused.

7. If a comparator is not available, visually inspect the crankshaft's bearing surfaces. Check the bearing's surface for scuffing or check the bearing's surface for the transfer of material.

8. Replace the crankshaft if any obvious signs of scuffing or transfer of material is found.

   Reference: Disassembly and Assembly, "Crankshaft Removal" Disassembly and Assembly, "Crankshaft Installation"

Whenever questions arise about this maintenance, consult the local Caterpillar dealer for the latest available information.