Cummins ISB 6.7 Parts - Oil Section

Cummins ISB 6.7L Oil System Components

The oil system of the Cummins ISB 6.7L engine plays a critical role in lubrication, cooling, and component longevity. At the heart of this system is the oil pump, which circulates oil through the engine to reduce friction, carry away heat, and maintain proper hydraulic pressure. A well-functioning oil pump ensures the engine’s crankshaft, camshaft, pistons, turbocharger, and valve train components remain protected from wear.

The Diesel Pro Power catalog for the Cummins ISB 6.7L covers the complete range of oil system parts, including oil pumps, oil coolers, gaskets, oil filters, oil pan gaskets, and pressure switches, all designed for marine and industrial applications. With over 40,000+ satisfied customers worldwide, Diesel Pro Power is a trusted source for OEM-quality Cummins parts that are built for reliability in demanding conditions.

Oil Pumps for Cummins ISB 6.7L Engines

Cummins ISB 6.7L engines come in different configurations, and their oil pump selection depends on the gear train location (front or rear) and the type of gear teeth (helix or straight cut). Diesel Pro Power offers multiple oil pump variations to suit each setup, ensuring perfect compatibility with your engine’s CPL (Control Parts List) number.

Rear Gear Train – Helix Teeth Design

One of the most common oil pump types for the ISB 6.7L is designed for engines with a rear gear train. These pumps feature 23/24 helix-cut pinion teeth, which provide smoother operation and reduced noise compared to straight-cut gears. This design is ideal for marine engines that require quieter operation without sacrificing oil flow volume.

Key Benefits:

• High-precision oil delivery for consistent lubrication

• Reduced gear noise compared to straight-cut models

• OEM-grade materials for long service life

Front Gear Train – Helix Teeth Design

Some ISB 6.7L engines use a front gear train configuration. The oil pump in this setup also utilizes 23/24 helix-cut pinions, ensuring smooth engagement with the drive gears and maintaining steady oil pressure throughout varying RPM ranges.

Applications:

• Common in certain marine propulsion engines

• Often paired with specific CPL numbers found in QSB 6.7L industrial engines

• Used in both propulsion and generator set applications

Rear Gear Train – Straight Teeth Design

For ISB 6.7L engines requiring maximum torque transmission in the oil pump drive, a rear gear train model with 22/24 straight teeth is available. While straight-cut gears may produce slightly more noise than helix gears, they offer extremely robust power transfer—ideal for high-load, high-RPM marine environments.

Advantages:

• Increased durability in heavy-duty cycles

• Simple gear profile for easier maintenance

• Often specified for commercial vessels with continuous duty requirements

Front Gear Train – Straight Teeth Design

This oil pump option features 22/24 straight-cut pinions for engines with a front gear train layout. It’s designed for specific CPL configurations and delivers reliable oil circulation in both propulsion and auxiliary power units.

Key Features:

• Built to withstand high operating pressures

• Designed for precise OEM fitment

• Perfect for applications where service access is from the front of the engine

Oil Coolers for Cummins ISB 6.7L

Oil coolers are vital for regulating oil temperature, preventing thermal breakdown, and maintaining lubrication efficiency. Diesel Pro Power supplies 5-plate, 7-plate, and rear gear train-specific oil coolers to match different ISB 6.7L configurations.

Benefits of a Properly Functioning Oil Cooler:

• Prevents overheating of engine oil under heavy loads

• Extends oil life and reduces sludge buildup

• Improves overall engine performance and efficiency

Oil System Gaskets & Seals

A properly sealed oil system prevents leaks, maintains oil pressure, and ensures optimal lubrication. Diesel Pro Power stocks all major gaskets for the ISB 6.7L oil system, including:

• Oil pan gaskets – prevent leakage at the oil sump

• Oil pick-up tube gaskets – maintain suction integrity to the pump

• Oil cooler cover gaskets – ensure proper sealing at the cooler housing

• Oil cooler core gaskets – available in composite and metal designs for durability

Oil Filters & Filtration Accessories

Maintaining clean oil is critical to ISB 6.7L engine longevity. Diesel Pro Power offers OEM-quality spin-on oil filters in multiple sizes, all meeting Cummins specifications for filtration efficiency and flow rate.

Available Options:

• Standard spin-on oil filters – for routine maintenance

• Extended-capacity filters – for extended service intervals in heavy-duty cycles

• Oil filter removal wrenches – for quick and easy servicing in confined marine engine rooms

Fuel & Oil Pressure Switches

To protect your ISB 6.7L engine, maintaining and monitoring oil pressure is essential. Diesel Pro Power carries a range of pressure switches in 5 PSI, 10 PSI, 20 PSI, and 27 PSI settings, all compatible with Cummins marine and industrial engines. These switches integrate with alarm panels to warn operators of low oil pressure conditions before damage occurs.

Maintenance Tips for Cummins ISB 6.7L Oil System

• Follow OEM service intervals – Replace oil and filters according to Cummins recommendations, adjusting for marine duty cycles.

• Inspect oil pump gears – Look for wear, pitting, or scoring that can reduce pressure.

• Monitor oil temperature – A rise in temperature could indicate an oil cooler issue.

• Replace gaskets during servicing – Reusing old seals can lead to leaks and loss of pressure.

• Use the correct oil viscosity – Marine and industrial applications may require different oil grades than on-road use.