RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
Crankshaft: Description and Operation
Location Of Crankshaft Identification
A crankshaft that has undersize journals is stamped with 1/4 inch letters near the notch of the No. 6 crankshaft counterweight.
FOR EXAMPLE: R2 stamped on the No. 6 crankshaft counterweight indicates that the No.2 rod journal is 0.025 mm (0.001 inch) undersize. M4
indicates that the No. 4 main journal is 0.025 mm (0.001 inch) undersize. R3 M2 indicates that the No. 3 rod journal and the No. 2 main journal are
both 0.025 mm (0.001 inch) undersize.
When a crankshaft is replaced, all main and connecting rod bearings, should be replaced with new bearings. Therefore, selective fitting of the bearings
is not required when a crankshaft and bearings are replaced.
