MerCruiser 423-804957T01 GM 93436083 Crankshaft 3.0L 140hp 4cyl 1-Piece Oil Seal Pulley - Water Pump 2172-6498A9

2172-6498A9

Earliest variant as it is a 1961 that doesn't have the extra support arm on the bottom which is not critical

hopefully you have already done your research on this

This would have been found on mainly 120hp 2

8L Models Volvo Penta 3853846

MerCruiser 423-804957T01 GM 93436083 Crankshaft 3.0L 140hp 4cyl 1-Piece Oil Seal Pulley - Water Pump 2172-6498A9Item Details MerCruiser Part Number 423 804957T01 423 804957 Used from 1999 & UP on MerCruiser GM 140hp 4cyl 3. 0L engines using the 1 piece oil seal Engine Serial Numbers SN# 0L605541 & Below (Roughly 1999 & UP) This is for engines with a 1 piece rear main seal. and using the narrow rod journals (1999 & UP). MerCruiser Part Number 423 810842 423 810842T GM part # 93436083. DOES NOT REPLACE 140966 (as the rod journal sizes are allegedly different