CRANKSHAFT The rear main cap (No. 7) includes an attaching point for the lube pump. Thrust washers to control axial movement straddle the central journal (cap No. 4). The remaining caps (Nos. 1–3, 5 and 6) are numbered to facilitate correct assembly. 13 The crankshaft is drop forged steel and induction hardened. It has seven journals with replaceable bearings. Five oversized replacement bearing options are available to accommodate crankshaft regrinding. Figure 13 — Crankshaft, Bearings, Thrust Washers and Cap Alignment Tabs 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 bearings 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 on the bearing cap aligns with the mark on the engine block. Page 21 DESCRIPTION AND OPERATION 1. Alignment Tab, Block 2. Alignment Tab, Cap 3. Thrust Washers 4. Upper and Lower Bearings