831247 14 Mercury SCREW

Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-1857 Retaining Ring Pliers 1
B 1U-6683 Ring Expander 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Installation of the piston pin bushing must be carried out by personnel with the correct training. Also special machinery is required.
Note: A new piston pin bushing is in a shape of a wedge. For further information on installation of the piston pin bushing, refer to your authorized Caterpillar dealer or your Caterpillar distributor for assistance.
Refer to Testing and Adjusting, "Connecting Rod - Inspect" for the correct height grade for the fractured split connecting rod.
Illustration 1 g01000785
Alignment of the shell
The bearing shells for the connecting rod and the connecting rod cap must be aligned by a tool before the bearing shells are installed. Refer to illustration 1. Check the alignment of the bearing shells and remove the alignment tool from the assembly. The bearing shell must be an equal distance from each end. Refer to illustration 2. Note: The alignment tool is supplied with new bearing shells .
Illustration 2 g01001160
Aligned shell
Align the mark (1) on the connecting rod to the boss cutout (2) of the piston. Also check that the arrow (3) that is marked on top of the piston is aligned. Install the piston pin into the piston and through the connecting rod. Note: If the piston pin cannot be installed by hand, use hot water in order to heat the piston to a temperature of 45° 5°C (113° 9°F).
Illustration 3 g01009410
Align the connecting rod to the piston.
Use Tooling (A) in order to install the circlips (4) that hold the piston pin in position.
Use Tooling (B) in order to install the piston rings on the piston with the following steps.
Illustration 4 g01010864
Install the spring (6) for the oil control piston ring (7) in the groove (4) that is lowest on the piston. The latch pin (5) must be located inside the ends of the spring. Locate the oil control ring (7) over the internal spring (6). Note: Ensure that the latch pin is 180 degrees from the oil control ring gap.
Illustration 5 g01010865
Install the intermediate piston ring (8) with the tapered face into the second groove on the piston. The stamp "TOP" must be toward the top of the piston. Note: Intermediate piston rings that are new have a green mark which must be on the left of the piston ring gap when the piston ring is installed.
Install the top piston ring (9) with the barrel face and the molybdenum insert into the top groove on the piston. The top piston ring has a keystone ring. The stamp "TOP" must be toward the top of the piston. Note: Top piston rings that are new have a red mark which must be on the left of the ring gap when the ring is installed.
Position the piston ring gaps at 120 degrees away from each other. End By:
Install the pistons and the connecting rods. Refer to Disassembly and Assembly, "Piston and Connecting Rods - Install".