Cummins ISL Parts – Crankshaft Section

The crankshaft is one of the most critical components in the Cummins ISL engine. It converts the up-and-down motion of the pistons into the rotational force that drives the flywheel, transmission, and ultimately the vessel or machine powered by the engine. In marine and industrial applications, the crankshaft is constantly subjected to high stresses, heavy loads, and continuous operation, making it essential to use quality replacement parts when performing maintenance or a full engine rebuild.

At Diesel Pro Power, we supply a complete range of Cummins ISL crankshaft parts, including new crankshafts, bearing shell sets, front and rear crankshaft seals, vibration dampers, and supporting gaskets. With over 40,000 satisfied customers worldwide, we are trusted for reliability, fast shipping, and expert support.

New Cummins ISL Crankshaft

A new crankshaft is the foundation of a proper bottom-end rebuild. The Cummins ISL crankshaft is a forged steel component designed to handle the torque and horsepower of mid-range engines in both marine and industrial settings. Over time, crankshafts can develop scoring, cracks, or wear in the journals due to inadequate lubrication, contamination, or long service hours.

Replacing the crankshaft during a rebuild ensures proper engine balance, smoother operation, and long-term durability. A new Cummins ISL crankshaft restores the factory specifications and is ideal for operators who want to return their engine to peak condition without compromise.

Crankshaft Bearings for Cummins ISL

Standard Bearing Shell Sets

The crankshaft rides on precision-engineered bearings that reduce friction and allow smooth rotation under extreme loads. Standard-size bearing shell sets for the Cummins ISL include both upper and lower halves, providing complete coverage for every journal in the engine. These bearings are designed to meet OEM specifications, ensuring proper oil clearance and long-lasting performance.

Standard-size bearings are used when the crankshaft journals remain within factory tolerances. If the crankshaft is still in good condition and has not been reground, standard bearings are the correct choice.

Oversize Bearing Shell Sets

When crankshaft journals are reground during an overhaul, oversize bearings are required to restore proper clearances. Cummins ISL oversize bearing shell sets are available in increments such as 0.25 mm and 0.50 mm. These bearings allow the engine to maintain oil pressure, reduce metal-to-metal contact, and operate smoothly after machining work has been performed.

Using the correct oversize bearing is crucial. Installing the wrong size can lead to oil starvation, bearing failure, and catastrophic engine damage. For this reason, oversize bearings are carefully matched to the crankshaft’s re-machined dimensions.

Cummins ISL Crankshaft Seals

Front Crankshaft Seal Kit

The front crankshaft seal prevents oil leaks at the timing gear end of the engine. Cummins ISL front seal kits typically include both the seal and sleeve, providing a reliable barrier against oil escaping under crankshaft pressure. In marine engines, where engine rooms operate in confined spaces, preventing oil leakage is critical to avoid safety hazards and maintain a clean working environment.

Rear Crankshaft Seal Kits

At the flywheel end of the engine, the rear crankshaft seal performs an equally important role. Cummins ISL rear seal kits are available for both dry clutch and wet clutch housing applications. Each kit includes the seal and a sleeve, ensuring a tight fit and long service life. Some kits feature double-lip seals for added protection in heavy-duty operating conditions.

Maintaining proper crankshaft seals is essential to avoid oil contamination of the clutch, flywheel, or bell housing. Even small leaks can lead to larger failures over time. Replacing seals during an overhaul or when leaks are detected helps ensure reliable operation.

Vibration Dampers for Cummins ISL

Every rotating crankshaft generates torsional vibrations as it transfers power through the engine. Left unchecked, these vibrations can damage bearings, gears, and even the crankshaft itself. The Cummins ISL vibration damper is designed to absorb and dissipate these forces, protecting the engine and extending its service life.

Vibration dampers for the ISL are available in multiple sizes to match engine configurations. Typically mounted at the front of the crankshaft, they feature a precision-balanced design with bolt holes for secure attachment. Replacing the vibration damper during a rebuild or after long service hours ensures smoother operation and reduces wear on the crankshaft and connected components.

Supporting Components for the Cummins ISL Crankshaft

Gear Housing Gasket

While not directly part of the crankshaft, the gear housing gasket is a supporting component that helps maintain proper sealing around the timing gear assembly. During crankshaft service or a bottom-end rebuild, it is often replaced to ensure no oil leaks develop around the gear housing area.

Integration with Other Engine Systems

The crankshaft’s function extends beyond simply rotating within the block. It works in harmony with piston kits, connecting rods, lubrication systems, and the camshaft drive to keep the engine operating smoothly. A properly installed crankshaft with fresh bearings, seals, and dampers ensures balanced performance, reduced vibration, and reliable long-term operation in demanding marine and industrial environments.

Why Choose Diesel Pro Power for Cummins ISL Crankshaft Parts

• Specialized for Cummins ISL Engines – Our catalog is tailored specifically for the ISL, ensuring that you receive parts engineered to fit and perform exactly as required.

• Complete Coverage – From new crankshafts to bearings, seals, and vibration dampers, you can find everything needed for a crankshaft rebuild in one place.

• Proven Reliability – With over 40,000 satisfied customers, Diesel Pro Power has built a reputation for quality and dependable service.

• Fast Global Shipping – Whether you operate a marine vessel or an industrial application, our logistics network delivers parts quickly, minimizing downtime.

• Expert Support – Our team is available to help identify the correct crankshaft components for your Cummins ISL engine, ensuring the right fit every time.