SHROUD AS 1873953 - Caterpillar

Crankshaft Front Seal
Illustration 1 g00664588The front oil seal (2) is normally installed to a depth of 7.00 0.25 mm (0.2756 0.0098 inch) (A) from the face of the front oil seal housing (6). The oil seal may cause wear on the hub of crankshaft pulley (3). This wear may allow oil leakage past the oil seal. If this situation occurs, the front oil seal can be installed to a depth of 9.3 mm (0.37 inch) from the face of the front oil seal housing.If a wear sleeve (4) is installed, the front oil seal is installed to a depth of 9.30 mm (0.366 inch) from the face of the front oil seal housing. When the wear sleeve is installed, the flange of the wear sleeve does not require removal. If a wear sleeve is installed, a new front oil seal must be installed. (5) Tighten three bolts for the crankshaft pulley to the following torque. ... 115 N m (85 lb ft)Crankshaft Rear Seal
Engines with 14 Bolt Housing Assembly
Illustration 2 g00317365
Positions of the crankshaft seal
Position (1) is 0 mm (0.0 inch) from the face of the rear housing.Position (2) is 4.6 mm (0.18 inch) from the face of the rear housing. Use position (2) if the crankshaft surface is worn in position (1).Position (3) is 6.9 mm (0.27 inch) from the face of the rear housing. Use position (3) if the crankshaft surface is worn in both of the other positions.Engines with 10 Bolt Housing Assembly
The 10 bolt housing assembly is manufactured as a one-piece assembly. There is no adjustment of the position from the face of the rear housing.Note: If a wear groove on the crankshaft flange has occurred, use a 209-8228 Sleeve to renew the sealing surface when you replace the housing assembly.Tighten the bolts that fasten the rear housing for the crankshaft rear seal to the cylinder block to the following torque. ... 22 N m (16 lb ft)