86 ENGINE COMPONENT AND LOCATION Piston and Connecting Rods W2033314 1. Piston Ring Set 5. Upper and Lower Connecting Rod Bearings 2. Piston 6. Connecting Rod Bearing Cap 3. Wrist Pin 7. Piston Cooling Nozzle 4. Connecting Rod 8. Assembly Matching Marks 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.