46-807151A9 Aftermarket Mercruiser Older-Style Plastic-Housing Seawater Pump | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket MerCruiser older-style plastic-housing seawater pump - Replacement Part Number: 46-807151A9

A complete serpentine-belt seawater pump assembly for selected MerCruiser Bravo, MIE and MPI V6/V8 engines. It is the plastic-housing pump used before the later bronze 46-862914T/8M0139995 design. The complete assembly includes the pulley and must be matched by engine serial, pulley offset and hose connection layout.

⚙️ Key Features

• Complete plastic-housing pump assembly

• Serpentine-belt pulley included

• Used on selected Bravo, MIE and ECM 555 MPI engines

• Replaceable flexible impeller

• Matches the older 46-807151A9 connection and bracket layout

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 46-807151A9 (primary older-style complete pump reference)

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

• 46-862914T10/T11/T12 and 8M0139995 are later pump families and are not automatically interchangeable

OEM / Related Numbers:

• 46-807151A9

• 46-807151A12

• Related impeller kit: 47-8M0104229 / 47-59362T6 family

Aftermarket / Verified Equivalents:

• GLM: 46-807151A9 replacement assembly

🚤 Compatibility

Commonly used on:

• Flexible-impeller raw-water cooling systems

Typically suits:

• Engine models:

• MerCruiser 4.3L V6 Bravo and MIE

• MerCruiser 5.0L V8 Bravo and MIE

• MerCruiser 5.7L / 350 MAG V8 Bravo and MIE

• MerCruiser 6.2L MPI / MX 6.2 V8 with ECM 555 where 46-807151A9 is specified

• HP Range: Engine-rating specific; approximately 190HP-320HP

• Engine Type: Serpentine-belt-driven MerCruiser petrol V6/V8 raw-water cooling system

• Year Range: Model- and serial-specific; confirm against OEM pump 46-807151A9

• Housing Type: Older-style plastic

• Drive: Serpentine belt

• Pulley: Included

• Application Note: Verify pulley offset and hose-port orientation

🔌 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