854124 Mercruiser STUD (M6 X 25)

Illustration 1 g00295557
Crankshaft and main bearing journals
Note: If a crankshaft that was not originally induction hardened has been remachined, then the crankshaft must be rehardened. Use one of the process that follow for 20 hours in order to reharden the crankshaft: nitrocarburizing process and nitriding process (1) Connecting rod bearing (2) Top and bottom thrust washer thickness Standard ... 2.26 to 2.31 mm (0.089 to 0.091 inch)Oversize ... 2.45 to 2.50 mm (0.096 to 0.098 inch) (3) Main bearing Clearance for main bearings ... 0.057 to 0.117 mm (0.0022 to 0.0046 inch)Bearing width Center bearing ... 36.32 to 36.70 mm (1.430 to 1.445 inch)All other bearings ... 31.62 to 31.88 mm (1.245 to 1.255 inch)Thickness of the bearing at the center All bearings ... 2.083 to 2.086 mm (0.0820 to 0.0821 inch) (4) Crankshaft gear (5) End play of the crankshaft ... 0.05 to 0.38 mm (0.002 to 0.015 inch)Maximum permissible end play ... 0.51 mm (0.020 inch) (6) Width of the connecting rod journal ... 40.35 to 40.42 mm (1.589 to 1.591 inch)Connecting rod journal diameter of flange ... 133.27 to 133.37 mm (5.247 to 5.251 inch)Depth of recess for connecting rod bearing ... 20.22 to 20.98 mm (0.796 to 0.826 inch)Bore of recess for connecting rod bearing ... 46.96 to 46.99 mm (1.849 to 1.850 inch) Measure the connecting rod journals on the crankshaft. See the following chart for the dimensions.
Table 1
Connecting Rod Bearing Journal
If the bearing journal has been ground beyond this size, then regrind the bearing journals to the next undersize journal. 63.43 mm (2.497 inch)
Original Size Journal 63.47 to 63.49 mm (2.499 to 2.500 inch)
Undersize Journal 0.25 mm (0.010 inch) 63.22 to 63.24 mm (2.489 to 2.490 inch)
Undersize Journal 0.51 mm (0.020 inch) 62.96 to 62.98 mm (2.479 to 2.480 inch)
Undersize Journal 0.76 mm (0.030 inch) 62.71 to 62.73 mm (2.469 to 2.470 inch) Connecting rod bearings are available for remachined journals with the following undersize dimensions: Undersize ... 0.25 (0.010)Undersize ... 0.51 (0.020)Undersize ... 0.76 (0.030) (7) Dimensions of main journals which are the standard, original size Width of front journal ... 36.93 to 37.69 mm (1.454 to 1.484 inch)Width of center journal ... 44.15 to 44.22 mm (1.738 to 1.741 inch)Width of all other journals ... 39.24 to 39.35 mm (1.545 to 1.549 inch)Measure the main bearing journals on the crankshaft. See the following chart for dimensions.
Table 2
Main Bearing Journal
If the bearing journal has been ground beyond this size, then regrind the bearing journals to the next undersize journal. 76.12 mm (2.996 inch)
Original Size Journal 76.16 to 76.18 mm (2.998 to 2.999 inch)
Undersize Journal 0.25 mm (0.010 inch) 75.91 to 75.93 mm (2.988 to 2.989 inch)
Undersize Journal 0.51 mm (0.020 inch) 75.65 to 75.67 mm (2.978 to 2.979 inch)
Undersize Journal 0.76 mm (0.030 inch) 75.40 to 75.42 mm (2.968 to 2.969 inch) Tighten the bolts for the main bearing journal to the following torque: ... 265 N m (195 lb ft)Main bearings are available for remachined journals with the following undersize dimensions: Undersize ... 0.25 (0.010)Undersize ... 0.51 (0.020)Undersize ... 0.76 (0.030)Tighten the retaining bolts of the crankshaft pulley (not shown) to the following torque: ... 115 N m (85 lb ft)Apply 9S-3263 Thread Lock Compound to the bolts of the crankshaft damper. Tighten the bolts (not shown) to the following torque: M8 bolts ... 35 N m (26 lb ft)M12 bolts ... 75 N m (55 lb ft)Tighten the bolts that fasten the rear oil seal housing to the cylinder block (not shown) to the following torque: ... 22 N m (16 lb ft)Tighten the bolts that fasten the rear oil seal housing to the bridge (not shown) to the following torque: M6 ... 13 N m (10 lb ft)M8 ... 18 N m (13 lb ft)