CORE AS-OIL COOLER 4P0251 - Caterpillar

Crankshaft Front Seal
(S/N: 4ZK; 6FK; 7AK; 1ML)
Depth of the crankshaft front seal from the front face of the oil seal housing ... 6.75 to 7.25 mm (0.266 to 0.285 inch)Maximum depth of the crankshaft front seal from the front of the oil seal housing ... 9.3 mm (0.37 inch)(S/N: 5YS; 7MS; 2PW; 3GW)
Depth of the crankshaft front seal from the front face of the oil seal housing ... 10.20 to 10.70 mm (0.402 to 0.421 inch)Crankshaft Rear Seal
Rear Seal (Two-piece Assembly)
Illustration 1 g00317365
Position (1) is 0.0 mm (0.0 inch) from the face of the rear housing. Position (1) can be used on engines that have a new crankshaft or a reconditioned crankshaft.Position (2) is 4.6 mm (0.18 inch) from the face of the rear housing. Position (2) is used when a new seal is first installed to a engine in service.Position (3) is 6.9 mm (0.27 inch) from the face of the rear housing. Position (3) is used when a new seal is installed in service and the crankshaft flange is worn in Position (2) .Rear Seal (One-piece Assembly)
The one-piece assembly has 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.