D330, D333, 3304, 3306 INDUSTRIAL & MARINE ENGINES Caterpillar


Pistons

Usage:

Remove Pistons

start by:

a) remove cylinder head

b) remove oil pump

1. Remove the carbon ridge from the top inside surface of the cylinder liners.

2. Turn the crankshaft until two pistons are at bottom center.

3. Remove the connecting rod caps (1) from these pistons and push the pistons up until the rings are free of the cylinder liner.

4. Remove the two pistons.

5. Do Steps 2, 3, and 4 for the remainder of the pistons.

Install Pistons

1. Put clean SAE 30 engine oil on the crankshaft bearing journals and cylinder liners.

2. Put clean SAE 30 engine oil on the pistons and connecting rod bearings.

3. Install the pistons with tool (A) making sure the "V" mark on the piston is in alignment with the "V" mark on the cylinder block. Push the lower end of the rod over the crankshaft journal to prevent causing damage to the crankshaft.

4. Put clean SAE 30 engine oil on threads of the bolts that hold the caps.

5. Put caps in position on the connecting rods and install nuts. Tighten both nuts to a torque of 30 ± 3 lb.ft. (4.1 ± 0.4 mkg). Put a mark on the nuts and at the end of both bolts and then tighten both nuts 90° from the mark.


NOTICE

During installation of the connecting rod cap, be sure that the number on the cap is in alignment with and is the same as the number on side of the connecting rod.


6. Turn the crankshaft until the next two bearing journals are at bottom center.

7. Do Steps 2 through 5 for the remainder of the pistons.

end by:

a) install oil pump

b) install cylinder head

Disassemble Pistons

start by:

a) remove pistons

1. Remove rings from piston with tool (A).

2. Remove snap ring (3), piston pin (1) and connecting rod (2) from piston.

Assemble Pistons

NOTE: If a replacement of the rod pin bearing is made, use a pin boring machine to make the bearing the correct size. See SPECIAL INSTRUCTION FORM GMG02394.

1. Install rod on piston with bearing tab groove (2) and number identification on the same side as the "V" mark (1) on top of the piston.

2. Install piston pin and snap rings.

3. When the old pistons are used, clean the piston grooves with tool (A) before installing new rings.

4. Install rings on piston with tool (B). The ring openings must be 90° apart.

end by:

a) install pistons

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