DJ Y-18021 Aftermarket Yanmar 6HYM Seawater Pump 126613-42012 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket DJ Pump Yanmar 6HYM seawater pump - Replacement Part Number: DJ Y-18021

A complete high-capacity seawater pump for Yanmar 6HYM-WET and 6HYM-ETE marine diesel engines. It replaces Yanmar 126613-42012. The DJ replacement uses a ductile-iron/bronze body, 50mm ports and serviceable internal parts, but its individual components are not interchangeable with the OEM pump.

⚙️ Key Features

• Heavy-duty FCD/bronze pump construction

• 50mm / 2-inch seawater ports

• Stainless-steel shaft with twin 6206 bearings

• Serviceable mechanical seal, oil seal, cover and wear plate

• Complete replacement for Yanmar 126613-42012

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• Yanmar 126613-42012 (OEM pump reference)

OEM / Related Numbers:

• DJ Y-18021

• Yanmar 126613-42012

• Impeller: DJ 086-0901 / Yanmar 125613-42762

• Mechanical seal: DJ-MS030

• Oil seal: DJY18021OSL

• Cover: DJY18021COV

• Seal cover: DJY18021SLC

• Wear plate: DJY18021WEP

• Shaft key: DJY18021KEY

• Bearings: 6206 open type - Quantity 2

Aftermarket / Verified Equivalents:

• DJ Pump: Y-18021

Important Fitment Notes:

• Internal DJ replacement parts are not directly interchangeable with the original Yanmar pump components.

🚤 Compatibility

Commonly used on:

• Flexible-impeller raw-water cooling systems

Typically suits:

• Engine models:

• Yanmar 6HYM-WET

• Yanmar 6HYM-ETE

• HP Range: Engine-rating specific

• Engine Type: Yanmar 6HYM inline-six heavy-duty marine diesel

• Year Range: Model-specific; confirm OEM pump 126613-42012

• Seawater Connections: 2 in / 50mm

• Weight: Approximately 11kg

• Impeller Reference: DJ 086-0901 / Yanmar 125613-42762

🔌 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