Genuine Specification Water Pump / Coolant Pump – OM651 Diesel Engine

Specification Overview

Genuine specification water pump for the Mercedes-Benz OM651 2.1L 4-cylinder diesel engine family. Manufactured to OEM specifications, this mechanical water pump ensures forced circulation of coolant between the engine block, cylinder head, and heat exchanger, maintaining stable engine operating temperatures under all conditions.

The OM651 water pump is driven via the belt pulley by a poly-V belt. The impeller is constructed from high-strength ceramic-reinforced PPS plastic, which reduces weight while maintaining durability and cavitation resistance.

• Type: Mechanical belt-driven water pump

• Impeller Material: Ceramic-reinforced PPS plastic

• Drive Type: Poly-V belt pulley

• Housing Material: Aluminium

• OE Cross-Reference Numbers: A6512000100, A6512000300, A6512001101, A6512001301, A6512001901, A6512002100, A6512004801, A6512006401, A6512006801, A6512007701, A6512008401

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Application & Engine Fitment

This water pump is designed for the OM651 series 2.1L 4-cylinder diesel engines, available in various power outputs from 95 hp to 204 hp.

Engine Codes:

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Comprehensive Model Fitment:

⚠️ Important: Multiple water pump variants exist for the OM651 engine family. Always verify the exact part number by VIN (17-digit chassis number) before ordering.

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Service Life & Change Intervals (Technical Data)

Standard Recommended Interval:

• 125,000 km or 24 months – Manufacturer warranty standard

• 120,000 km – 150,000 km – Typical service life under normal conditions

Critical Adjustment for Kampala (Severe Operating Conditions):
The operational climate (ambient temperatures 20°C–40°C), high humidity, stop-and-go urban traffic, and high dust loads classify as “Severe Duty” per MB Work Instructions. Under these conditions, the water pump bearings and seals experience accelerated wear.

Recommended Replacement Interval under East African operating parameters:

• Maximum: 80,000 km or 4 years (whichever occurs first)

• Heavy urban use (taxis, fleets, daily city driving): 60,000 km or 3 years

• Commercial vehicles (Sprinter, Vito): 50,000 km recommended due to higher thermal stress and load

Failure Symptoms – When to Replace:

• Coolant leaks from the pump weep hole (bearing seal failure)

• Engine overheating or unstable operating temperature

• Unusual noise from the front of the engine (whining or grinding)

• Coolant level dropping without visible external leaks

• Belt squeal or misalignment

⚠️ Important: When replacing the water pump, always replace the following simultaneously:

• Drive belt (poly-V belt)

• Belt tensioner and idler pulleys (if worn)

• Coolant (MB 325.6 G40 specification)

• Thermostat (recommended)

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Packaging & Pricing (Alps Autoz Kampala)

Often Replaced Together:
For a complete cooling system service, replace the following simultaneously:

• Water pump (013046804KT)

• Drive belt (per chassis application)

• Thermostat (A6512000115 or equivalent)

• Coolant (MB 325.6 G40 – A0009891808)

• Belt tensioner (if showing signs of wear)

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Technical Notes for the Workshop

• Installation: This is a mechanical belt-driven pump. Ensure proper belt tension and alignment during installation.

• Torque Specification: Refer to specific model service manual for water pump mounting bolt torque specifications.

• Coolant Refill: Always use genuine Mercedes-Benz coolant (MB 325.6 G40 specification). Bleed the cooling system thoroughly after installation to prevent air locks.

• Genuine vs. Aftermarket: SALISBOUETEX parts are manufactured to OEM specifications. Equivalent aftermarket brands with cross-reference include:

  • GRAF PA1376

  • AIRTEX WP2693

  • DOLZ M258

  • HEPU P1518

• Storage: Shelf life of 5 years in unopened, sealed packaging. Store in a dry environment away from direct sunlight.

• Compatibility Note: This water pump is designed for OM651 diesel engines only. Do not use on OM642, OM654, or any petrol engines.

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Alps Autoz – Kampala