A Teflon ® seal bearing directly on the crankshaft flange is used at the front of the crankshaft. The front seal has an outer felt ring which serves as a dust cover. At the rear of the crankshaft is another seal that bears directly on the machined surface of the crankshaft gear. Additionally at the rear, there is a groove in the rear crankshaft flange for an O-ring which forms a seal between the flange and the gear. Whenever the lower main bearing caps are installed in the engine block, pay special attention to ensure the lower main bearing cap is installed in the same location of the engine block as removed.
Also, ensure that the aligning mark (boss) on the bearing cap aligns with the mark (boss) on the engine block. 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. 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. Page 21 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