46-72774A32 Aftermarket Mercruiser Old-Style Plastic-Housing Seawater Pump without Pulley | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket MerCruiser old-style plastic-housing seawater pump without pulley - Replacement Part Number: 46-72774A32

A complete old-style plastic-housing seawater pump for V-belt-driven MerCruiser V8 engines. This assembly is supplied without the drive pulley so the serviceable original pulley must be transferred when compatible. It replaces several earlier 46-72774, 46-73823, 46-63450 and 46-59112 pump assemblies.

⚙️ Key Features

• Old-style moulded pump housing

• Designed for V-belt-driven MerCruiser V8 installations

• Supplied without drive pulley

• Replaceable flexible impeller and wear components

• Direct replacement for the listed early pump assemblies

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 46-72774A32 → Later replacement for 46-72774A11

• 46-72774A11 → Replaces 46-73823A7, 46-63450A2 and 46-59112A2 on specified engines

• 46-807151A12 is a related later service assembly for selected installations

OEM / Related Numbers:

• 46-72774A32

• 46-72774A11

• 46-73823A7

• 46-63450A2

• 46-59112A2

• 46-807151A12

• Impeller: 47-59362T1 / HJB-H-129

Aftermarket / Verified Equivalents:

• Sierra: 18-3600

• Recmar: REC46-72774A32

Important Fitment Notes:

• Do not order this pump for a serpentine-belt installation that requires 46-807151A9/A12 or the later 46-862914T pump family.

🚤 Compatibility

Commonly used on:

• Flexible-impeller raw-water cooling systems

Typically suits:

• Engine models:

• MerCruiser 5.0L / 305 CID V8 with V-belt pump drive

• MerCruiser 5.7L / 350 CID V8 with V-belt pump drive

• MerCruiser 7.4L / 454 CID V8 applications whose original pump cross-references to 46-72774A32

• HP Range: Engine-rating specific; approximately 200HP-365HP

• Engine Type: V-belt-driven MerCruiser petrol V8 raw-water cooling system

• Year Range: Primarily approximately 1985-1995; verify by engine serial and original pump number

• Housing Type: Old-style plastic

• Drive: V-belt

• Pulley: Not included

• Impeller Reference: 47-59362T1 / HJB-H-129

🔌 Function

The seawater pump draws raw water through the intake and circulates it through the engine, heat exchanger, oil cooler, aftercooler and wet-exhaust circuit as applicable. Its flexible impeller must maintain adequate flow from idle through full load while the shaft, bearings and mechanical seal keep the drive and water sections correctly supported and separated.

Common signs of failure:

• Engine temperature rises under load or at higher RPM

• Reduced or intermittent water discharge from the exhaust

• Missing, cracked, swollen or permanently set impeller vanes

• Seawater leakage or salt tracks from the shaft seal or weep area

• Bearing noise, pulley or gear wobble, or excessive shaft movement

• Scored cover plate, worn cam or damaged pump housing reduces suction

• Internal corrosion, air leakage or blocked inlet passages cause loss of prime

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging