Cummins ISB 5.9 Parts - Crankshaft Section

Crankshaft Components for Cummins ISB 5.9L Engines

The crankshaft is one of the most critical components in the Cummins ISB 5.9L engine, converting the linear force from the pistons into the rotational energy that powers your vessel or industrial equipment. A well-balanced, high-strength crankshaft ensures smoother operation, extended service life, and consistent performance in demanding marine and industrial environments.

At Diesel Pro Power, we supply premium aftermarket crankshafts, bearings, and seal kits built to meet or exceed Cummins factory specifications. Each component is manufactured to tight tolerances, ensuring direct fitment and reliable performance in ISB 5.9L rebuilds and overhauls.

New Aftermarket Crankshaft for Cummins ISB 5.9L

Our new aftermarket crankshaft is a high-quality replacement for ISB 5.9L engines when the original crankshaft is worn, cracked, or damaged. This version does not include the timing gear, making it ideal for rebuilds where the existing gear can be reused.

• Precision-machined journals for exact fit with standard or oversize bearings.

• Hardened surfaces to withstand high-load marine and industrial applications.

• Individually balanced to reduce vibration and protect surrounding components.

• Compatible with ISB 5.9L marine propulsion, generator sets, and stationary power applications.

Aftermarket Crankshaft Assembly with Timing Gear

For a complete, ready-to-install option, our aftermarket crankshaft assembly comes with the timing gear already pressed into place. This allows for faster installation and ensures proper gear alignment without the need for special tools.

• Includes pre-installed timing gear for convenience.

• Ideal for full overhauls where gear wear is suspected.

• Built from high-strength steel alloys for long service life.

• Works in ISB 5.9L engines as well as certain ISB 6.7L and QSB models.

Aftermarket Upper Gasket Sets

Proper sealing is essential for crankshaft installation, and our aftermarket upper gasket sets are designed specifically for ISB 5.9L configurations, with options for both EGR and non-EGR models.

• Non-EGR gasket set: Designed for earlier ISB 5.9L and marine configurations without exhaust gas recirculation.

• EGR-compatible gasket set: Built for high-pressure common rail systems with EGR emissions systems.

• Includes all upper-engine seals needed during crankshaft replacement.

Aftermarket Lower Gasket Sets for Rear Gear Train Engines

The aftermarket lower gasket set includes all bottom-end sealing components needed for ISB 5.9L engines with a rear gear train.

• Contains oil pan gasket, front and rear crank seals, and required O-rings.

• Designed for marine and industrial applications with high oil retention demands.

• Helps maintain sealing integrity during heavy-duty operation.

Aftermarket Crankshaft Bearing Shell Sets

We offer aftermarket crankshaft bearing shell sets in multiple sizes to match both standard and reground crankshaft journals:

• Standard size bearings for crankshafts within original factory measurements.

• 0.25 mm oversize bearings for first-stage reground crankshafts.

• 0.50 mm oversize bearings for more extensively machined crankshafts.

Each set includes both upper and lower bearing halves for a complete engine installation.

Aftermarket Front Crankshaft Seal Kits

Our aftermarket front crankshaft seal kit prevents oil leakage where the crankshaft exits the front of the block.

• Includes sealing lip and protective sleeve.

• Designed for high-RPM durability in marine and industrial duty cycles.

• Fits ISB 5.9L and certain QSB variants.

Aftermarket Rear Crankshaft Seal Kits

We provide aftermarket rear crankshaft seal kits for both dry and wet clutch configurations:

• Dry clutch housing version: Seal and sleeve for mechanical gearbox or industrial applications.

• Wet clutch housing version: Double-lip seal for enhanced oil retention in marine transmissions or other fluid-coupled setups.

Cross-Compatibility

While built for the Cummins ISB 5.9L, these aftermarket crankshaft components also fit related engines, including:

• ISB 6.7L

• QSB 5.9L

• QSB 6.7L

• Certain 6B and 6BT legacy models (bearings and seals only)

Installation Best Practices

When installing a new aftermarket crankshaft in an ISB 5.9L engine:

1. Clean and inspect all block surfaces before installation.

2. Measure bearing clearances precisely.

3. Torque fasteners according to Cummins specifications.

4. Prime the lubrication system before starting the engine.

5. Replace all seals and gaskets to ensure a leak-free rebuild.

Why Diesel Pro Power for Aftermarket ISB 5.9L Crankshaft Parts

• Over 40,000 satisfied customers worldwide.

• High-quality aftermarket parts built to last.

• Fast shipping with all items in stock.

• Technical expertise to ensure correct part selection.