Cummins ISB 6.7 Parts for Canada - Engine Water Pump Section

Cummins ISB 6.7 Engine – Freshwater Pump & Cooling System Components

The Cummins ISB 6.7 engine is widely used in both industrial and marine applications. To keep this engine running at optimal performance, a well-functioning cooling system is essential—starting with a dependable freshwater pump. Diesel Pro Power offers a complete catalog of cooling components specifically for the ISB 6.7, including water pumps, thermostat assemblies, serpentine belts, tensioners, clamps, silicone hoses, and more.

Our components are built to meet or exceed OEM standards and are designed for long service life in demanding environments.

Engine Water Pumps for Cummins ISB 6.7

Primary Freshwater Pump

This direct replacement freshwater pump is designed for Cummins ISB 6.7 engines and select compatible engines like the QSB 6.7, 6C, 6CT, and 6CTA. Each pump includes a high-quality impeller and housing assembly to ensure consistent coolant circulation, reduce wear, and maintain proper engine operating temperature.

Key features include:

• Heavy-duty cast housing for long-term durability
  
  

• Sealed bearing design to reduce maintenance
  
  

• Compatible with a broad range of CPL numbers
  
  

• Fully assembled and ready to install
  
  

• Designed for quick and accurate fit on ISB 6.7 marine and industrial setups
  
  

This water pump is engineered to match the flow rate and pressure requirements of Cummins mid-range diesel platforms, making it a reliable choice for new builds or service overhauls.

Thermostats and Thermostat Seals

Temperature control is critical to engine longevity and fuel efficiency. Diesel Pro Power carries two common thermostat temperature ratings for ISB 6.7 engines:

Thermostat Options

• 165°F thermostat – Opens earlier to regulate heat under high-load or hot-climate conditions
  
  

• 180°F thermostat – Standard for colder climates or general-use applications
  
  

Both thermostat options are compatible with ISB 6.7 engines and related models. Each thermostat is precision-calibrated to maintain tight temperature control and ensure even engine warm-up.

Thermostat Seals

Thermostat seals are included separately for replacement needs. These high-temperature-resistant seals prevent coolant leaks and ensure a proper mating surface between the thermostat housing and engine block.

Belt Tensioners for Cummins ISB 6.7

Our catalog includes two types of belt tensioners for the ISB 6.7:

• Plain pulley tensioner
  
  

• Grooved pulley tensioner
  
  

These tensioners are responsible for maintaining the proper tension on serpentine belts that drive the water pump, alternator, and fan system. A worn or loose tensioner can cause belt slippage and lead to poor cooling performance or charging issues.

Highlights:

• Compatible with ISB, QSB, B, 6C, and 6CT engines
  
  

• Spring-loaded for automatic tension adjustment
  
  

• Designed for marine and industrial operating conditions
  
  

• Resistant to vibration and environmental wear
  
  

Serpentine Belts for Water Pump, Alternator & Fan Drive

A reliable belt is essential to keep your water pump and alternator operating correctly. Diesel Pro Power offers a variety of serpentine belts designed to fit the ISB 6.7 and related Cummins engines.

Key Belt Specifications:

• Ribbed design (8 ribs) for superior grip
  
  

• Serpentine V-belt style for continuous rotation across multiple pulleys
  
  

• Available in multiple lengths to accommodate various belt routing configurations
  
  

• Designed for applications powering the water pump, alternator, and fan together
  
  

Each belt is constructed with reinforced rubber compounds to resist wear, cracking, and stretching under continuous heat and load cycles.

Water Pump Seal Ring

The water pump seal ring (also referred to as a water pan seal) ensures that the water pump is tightly sealed against the engine block. Over time, these rings can harden or deform, leading to leaks.

Key features:

• Molded for precision fit
  
  

• Compatible with ISB 6.7 water pump assemblies
  
  

• Resists coolant breakdown and temperature cycling
  
  

Replacing this seal during a water pump service ensures proper long-term sealing.

Silicone Coolant Hoses – Multiple Sizes Available

High-performance silicone coolant hoses are essential for long-term durability, especially in marine or industrial environments where heat and vibration are constant. Diesel Pro Power offers cut-to-length silicone hoses for your Cummins ISB 6.7 cooling system in a wide range of diameters.

Available Inner Diameters:

• 3/4"
  
  

• 1"
  
  

• 1-3/4"
  
  

• 1-7/8"
  
  

• 2"
  
  

• 2-1/8"
  
  

• 2-1/4"
  
  

• 2-3/8"
  
  

• 2-1/2"
  
  

• 2-3/4"
  
  

• 3"
  
  

• 3-1/2"
  
  

• 4"
  
  

Each hose is sold by the foot and features:

• Multi-layer silicone with textile reinforcement
  
  

• High heat tolerance
  
  

• Superior flexibility for tight-radius bends
  
  

• Long service life compared to rubber hoses
  
  

Stainless Steel Hose Clamps

Diesel Pro Power stocks a complete range of stainless steel hose clamps to secure coolant and fuel hoses on Cummins ISB 6.7 engines.

Clamp Diameter Ranges:

• From 9/16" up to 3.5"
  
  

• Designed for all hose diameters used in the ISB 6.7 cooling system
  
  

These clamps are made from corrosion-resistant stainless steel for durability in marine and outdoor environments. Each clamp provides even pressure distribution and a tight seal to prevent leaks under pressure.

Temperature Switches for ISB 6.7 Cooling Systems

Our temperature switches are designed to activate auxiliary fans or warning alarms when the coolant temperature reaches a preset threshold (typically around 205°F). These are threaded for easy installation and compatible with most Cummins, Detroit Diesel, and Caterpillar control systems.

Features:

• Reliable thermal actuation
  
  

• Standard NPT thread size for compatibility
  
  

• Designed to work in diesel engine cooling circuits
  
  

Radiator Cleaner for Closed-Loop Cooling Systems

Prevent clogging and scale buildup in your Cummins ISB 6.7 cooling system with a radiator cleaner formulated for diesel engine use. This cleaner removes rust, deposits, and sludge to restore optimal heat transfer.

Recommended during overhaul or before installing a new water pump or thermostat.

Gauges for Monitoring Engine Coolant Temperature

To support proactive cooling system maintenance, Diesel Pro Power carries:

• Mechanical gauges (standard and with alarms)
  
  

• Electrical gauges (12V and 24V options)
  
  

These gauges are ideal for marine and industrial panels where monitoring engine coolant temperature and pressure is critical.

Why Cooling System Health Matters

Proper cooling is fundamental to Cummins ISB 6.7 engine performance and longevity. A compromised cooling system can result in:

• Overheating
  
  

• Reduced fuel efficiency
  
  

• Premature engine wear
  
  

• Unexpected downtime
  
  

By maintaining a high-quality freshwater pump, proper belt tension, clean coolant paths, and secure hoses, operators can extend engine life and avoid costly repairs.

Applications & Compatibility

All components in this catalog are designed for the Cummins ISB 6.7 engine, but many are also fully compatible with:

• QSB 6.7
  
  

• ISB 5.9
  
  

• QSB 5.9
  
  

• 6C, 6CT, and 6CTA engines
  
  

Always confirm your engine CPL or refer to service documentation when selecting replacement parts.