Piston And Connecting Rods - Volvo EPA2007 D13F Reference Manual

86 ENGINE COMPONENT AND LOCATION

Piston and Connecting Rods

1. Piston Ring Set
2. Piston
3. Wrist Pin
4. Connecting Rod
Connecting rods are forged steel and are used in combination with one-piece
Monosteel steel pistons. The bearing caps are attached with four M12 capscrews
spaced to prevent misalignment. The rods and caps are made by a "fracture"
process that requires a cap be assembled with its original rod. Never attempt to use
mismatched rods and caps.
The piston is fitted with three rings. In the top groove is a compression ring with a
"keystone" cross section. In the second groove, the compression ring has a rectangular
cross section. In the third groove is a spring-loaded oil scraper ring.
5. Upper and Lower Connecting Rod
Bearings
6. Connecting Rod Bearing Cap
7. Piston Cooling Nozzle
8. Assembly Matching Marks
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