B250 3/4 Ton Van V8-318 5.2L VIN T FI (1992)
Crankshaft Main Bearing Seal: Service and Repair
Fig. 30 Rear Main Bearing Cap
When necessary to replace rear main bearing oil seal on V6-238 and V8-318 engines, removal of engine from vehicle or removal of crankshaft
from engine block is not necessary. Remove engine oil pan refer to OIL PAN then the rear main bearing cap. Using oil seal replacement tool
No. KD-492 or equivalent, remove defective upper seal, then, using same tool, install new seal. After installation, trim upper seal to eliminate
frayed ends. Install rear main bearing cap, then the oil pan, refer to OIL PAN.
Replacement of rear main bearing oil seals is similar to procedure given above for in line 6 cylinder engines. A seal retainer is not found on these
engines; lower half of seal is installed into groove in rear main bearing cap.
The 238 and 318 engines have cap seals in addition to lower seal secured by rear main bearing cap. Cap seal with yellow paint is installed, narrow
sealing edge up, into right side with bearing cap in engine position. Cap seals must be flush with shoulder of bearing cap to prevent oil leakage.
The 360 engine requires sealer to be applied adjacent to rear main bearing oil seal, Fig. 30, as cap seals are not used. After applying sealer, quickly
assemble rear main bearing cap to block and tighten to specifications.
