MerCruiser 423-804957T01 GM 93436083 Crankshaft 3.0L 140hp 4cyl 1-Piece Oil Seal Pulley - Water Pump hopefully you have already done

hopefully you have already done your research on this

The short hub propellers were generally used with the smaller 4-cyl engines) (Long hub propellers used with V6 V8 / AQD40 / AQAD31 / 40 / 41 engines

8L Models Volvo Penta 3853846

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

MerCruiser GM V8 applications 1983-1986 GM 5

MerCruiser 423-804957T01 GM 93436083 Crankshaft 3.0L 140hp 4cyl 1-Piece Oil Seal Pulley - Water Pump hopefully you have already doneItem 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