300TD (123.193) L5-3.0L DSL Turbo (617.952) (1984)
Crankshaft: Service and Repair
Checking and Reconditioning Crankshaft
NOTE: The bearing journals of crankshaft are not inductance hardened similar to other engines, but are hardened in a nitride bath.
Contrary to inductance hardened crankshaft, a bath-nitrided crankshaft is hardened at its entire surface.
Conventional hardness tester (hardness drop tester) provides no information concerning proper hardness (depth of connecting layer) for crankshafts
hardened in a nitride bath. No hardness test according to the above method is therefore required.
When testing and reconditioning crankshafts, proceed in sequence of diagram below.