PISTONS AND CONNECTING RODS 14 Figure 14 — Piston and 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. 15 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.
Figure 15 — Piston Cooling Page 22 DESCRIPTION AND OPERATION 1. Piston Ring Set 2. Wrist Pin Snap Ring 3. Piston 4. Piston Cooling Nozzle 5. Assembly Matching Marks 6. Connecting Rod Bolts 7. Connecting Rod Bearing Cap 8. Upper and Lower Connecting Rod Bearings 9. Connecting Rod 10. Wrist Pin 1. Piston Cooling Nozzle 2. Control Valve 3. Opening Valve