Cummins M11 Parts – Crankshaft and Related Components

The Cummins M11 engine is renowned for its durability and balance of power across marine, industrial, and heavy-duty applications. At the heart of this reliability lies the crankshaft assembly and its related components, which ensure smooth rotation, efficient power transfer, and long service life. Whether you’re performing a complete rebuild or a targeted repair, maintaining the crankshaft and its seals, bearings, and gaskets is critical to the long-term performance of your M11.

Diesel Pro Power supplies new Cummins M11 crankshafts, bearing shell sets, gaskets, and sealing kits—all designed for factory fitment and lasting dependability. With more than 40,000 satisfied customers worldwide, we make it easy to source every component you need to keep your engine running at peak efficiency.

Crankshaft for Cummins M11

The crankshaft is the backbone of the engine, converting linear piston movement into rotational power that drives your machinery. A new Cummins M11 crankshaft is built to factory specifications and precision-machined for balance and durability.

• OEM-grade construction: Designed to handle heavy-duty operating conditions in marine and industrial environments.

• Compatibility: Direct fit for the Cummins M11, with shared application across ISM and QSM platforms, as well as select L10 variants.

• Durability: Heat-treated journals and hardened fillets to reduce fatigue and extend crankshaft life.

• Balanced rotation: Ensures reduced vibration, smoother performance, and longer bearing and seal life.

Replacing a worn crankshaft is essential when signs of fatigue, scoring, or out-of-round journals are found. A new unit ensures reliable operation and prevents catastrophic failure that could result from running a damaged crankshaft.

Gasket Sets for Cummins M11 Crankshaft Assembly

A crankshaft installation requires precise sealing to prevent oil leaks, maintain internal pressure, and protect bearings. Cummins M11 gasket sets are designed to provide a complete sealing solution for both the upper and lower engine assemblies.

Upper Gasket Set for M11

• Covers the cylinder head and top-end sealing components.

• Includes gaskets for intake, exhaust, and valve components that tie into crankcase pressure balance.

• Ensures a tight seal between combustion chambers and the oiling system.

Lower Gasket Set for M11

• Focused on the crankshaft and lower block assembly.

• Includes the oil pan gasket, rear main seals, and other lower-end sealing components.

• Prevents oil leakage and protects the crankshaft bearings from contamination.

Both gasket sets are built with high-temperature, oil-resistant materials that withstand the extreme environments of marine and industrial engines.

Crankshaft Bearings for Cummins M11

The bearing shell sets form the interface between the crankshaft journals and the engine block. Precision-fit bearings reduce friction, prevent wear, and keep the crankshaft spinning freely.

Standard Bearing Shell Set

• Designed for engines with journals machined to standard factory size.

• Provides a full set of upper and lower main bearings for the complete crankshaft.

• Manufactured with durable materials for long service life and excellent load-bearing capability.

Oversize Bearing Shell Set (0.010")

• Intended for engines that have had journals polished or ground undersize during a rebuild.

• Ensures a proper fit, correct oil clearance, and consistent lubrication.

• Protects against scoring and wear in high-load applications.

Using the correct size of bearing is critical—standard for unmodified crankshafts, and oversize when machining has been performed.

Crankshaft Seal Kits for Cummins M11

Maintaining oil-tight seals around the crankshaft is essential for long-term engine health. The M11 uses both front and rear crankshaft seal kits, each designed for precision fitment.

Front Crankshaft Seal Kit

• Includes both the seal and sleeve for proper installation.

• Fits external damper engines.

• Prevents oil leaks from the timing cover and front crankshaft area.

Rear Crankshaft Seal Kit (Early Engines)

• Includes seal and sleeve for older Cummins M11 configurations.

• Provides secure sealing around the flywheel housing and rear crankshaft exit.

Rear Crankshaft Seal Kit (Late Engines)

• Designed for updated M11 engines with late-model configuration.

• Ensures compatibility with revised crankshaft and housing designs.

• Maintains consistent oil sealing under heavy load and extended operating hours.

Both front and rear seal kits are critical for preventing oil loss, maintaining lubrication pressure, and avoiding contamination of the clutch or transmission.

Front Cover Seal Ring for Cummins M11

The front cover seal ring provides an additional layer of protection by sealing the front timing cover to the engine block. This small but vital component keeps contaminants out of the crankshaft area and helps maintain crankcase integrity.

• Resists oil seepage under heat and vibration.

• Affordable insurance against premature wear on major components.

• Designed for precise fitment to Cummins M11 engines.

Why Quality Crankshaft Components Matter

The crankshaft is one of the most stressed components inside the engine. Failures due to poor lubrication, improper sealing, or worn bearings can lead to:

• Loss of oil pressure and catastrophic engine damage.

• Excessive vibration, leading to faster wear on surrounding components.

• Seized journals caused by bearing failure.

• Oil leaks, which can damage surrounding components or create unsafe operating conditions.

Using OEM-quality Cummins M11 crankshaft components ensures that your engine remains reliable, efficient, and ready for demanding duty cycles.

Diesel Pro Power – Your Source for Cummins M11 Crankshaft Parts

When you choose Diesel Pro Power, you gain:

• Guaranteed compatibility with Cummins M11 engines.

• Worldwide shipping to keep fleets and vessels moving without delay.

• Trusted by 40,000+ customers across marine, industrial, and commercial applications.

• Comprehensive inventory so you can source your crankshaft, gaskets, bearings, and seals in one place.