ME 6115-545-34/14-451. Front main bearing cap3. Center main bearing cap2. Intermediate main bearing caps4. Rear main bearing capCAUTIONFigure 14-45.MainBearing CapsMake certain the backs of bearing shells arefree from dirt and grit particles.(2) Lubricate all crankshaft main bearing jour-nals with engine oil; lower the crankshaft into positionin the cylinder block with flywheel flange end of crank-shaft toward the rear.CAUTIONMake certain that timing mark on crankshaftgear is aligned with timing mark on camshaftgear, when crankshaft is installed.(3) Place the lower halves of the main bearingshells in position in the main bearing caps.CAUTIONMake certain the backs of the bearing shellsare free from dirt and grit particles.(4) The bearing caps are numbered 1,2,3, etc.indicating their respective positions. Before instal-ling center main bearing cap, insert upper thrustflanges (flanges without dowel pin holes) with oilgrooves of thrust flanges located next to cheeks ofthe crankshaft. Position lower thrust flanges ondowel pins, with the oil grooves in the thrust flangesto the outside of the bearing cap.(5) Install main bearing caps with numbersfacing camshaft side of the engine and correspondingto number stamped on lower edge of cylinder blockas shown in figure 14-45. Install the main bearingcap attaching lock bolts snugly. Force crankshaftin both directions to align the bearing caps with theupper portion of the main bearing bores.(6) Using a torque-indicating wrench, tightenthe main bearing cap lock bolts to a torque of 170 to190 foot-pounds.CAUTIONDo not overtighten main bearing lock bolts.If these lock bolts are overtightened, bear-ing caps may be distorted, causing bearingto be drawn tight against the crankshaft andpremature failure will result. The crank-shaft should turn freely after all capscrewsare properly torqued. Never file or shima bearing cap to make the bearings shell fit;install new bearing shells if fit on thecrankshaft is unsatisfactory.14-95
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