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OVERSIZE AND UNDERSIZE ENGINE COMPONENT MARKINGS CHART OS-US Item Identification Location of Identification U/S Crankshaft R or M M-2-3 ect. Milled flat on .0254 MM (indicating No. 2 & No. eight (.001 IN.) 3 main bearing crankshaft journal) and/or counterweight. R-1-4 ect. (indicating No. 1 & 4 connecting rod journal) O/S Tappets L 3/8 9 .2032 mm diamound (.008 in.) -shaped stamp Top pad — Front of engine and flat ground on outside surface of each O/S tappet bore. O/S Valve Stems X Milled pad .127 mm adjacent to two (0.005 in.) 3/8 9 tapped holes on each end of cylinder head. SPECIAL TOOLS ENGINE—3.9L Oil Pressure Gauge C-3292 Engine Support Fixture C-3487–A Valve Spring Compressor MD-998772–A Adapter 6633 Adapter 6716A 9 - 80 ENGINE 3.9L AN ENGINE 3.9L (Continued) |