Cylinder Heads & Related Components for Cummins ISB 4.5 Engines

Overview of the Cummins ISB 4.5 Cylinder Head

The Cummins ISB 4.5 engine is a powerful and compact mid-range diesel engine designed to serve a variety of industrial, agricultural, and off-road applications. A vital component at the top of the engine block, the cylinder head plays a critical role in housing the intake and exhaust valves, fuel injectors, and other essential components that directly impact engine performance.

When rebuilding, overhauling, or simply replacing worn parts, choosing a high-quality cylinder head and supporting components is key to restoring the performance, fuel efficiency, and emissions compliance of your Cummins ISB 4.5 engine. At Diesel Pro Power, we offer new cylinder head components fully compatible with ISB 4.5 engines and backed by support trusted by over 40,000 satisfied customers worldwide.

New Cylinder Head Assemblies for ISB 4.5

Our new cylinder head options for the Cummins ISB 4.5 are available fully assembled with valves and springs for faster installation. These units are manufactured to strict OE-equivalent standards and pressure-tested for quality and durability. Each head is precision-cast, machined, and cleaned before being fitted with pre-installed intake and exhaust valves and valve springs.

Key Features:

• Designed specifically for Cummins ISB 4.5 diesel engines

• Compatible with marine, agricultural, and industrial configurations

• Supplied with intake and exhaust valves and valve springs installed

• Includes updated design elements for improved heat dissipation

• Clean and ready for installation — no core required

Intake and Exhaust Valves for ISB 4.5

Valve integrity is essential for proper airflow and combustion. If you’re servicing or rebuilding a cylinder head, fresh intake and exhaust valves are recommended. Our valve sets are crafted from high-quality alloys to withstand high temperatures and continuous operation.

Intake Valves

• Engineered for high-temperature resistance and precise sealing

• Compatible with both ISB and QSB series engines

• Replace one valve per cylinder for optimal air intake function

Exhaust Valves

• Hardened construction for longevity under high thermal stress

• Includes valve keepers where applicable

• Ensures clean and complete exhaust flow

Valve Kits

• Available in complete kits that include seals, guides, and keepers

• Simplifies ordering and guarantees fit across compatible engines

Valve Seals and Inserts

Proper sealing around each valve stem is vital for keeping oil out of the combustion chamber and ensuring long-term engine health. Diesel Pro Power carries all the necessary seals and insert components you need when replacing or rebuilding your ISB 4.5 cylinder head.

Intake Valve Seals

• Designed to prevent oil leakage around intake valves

• Compatible with all QSB and ISB 4.5 engine heads

Exhaust Valve Seals

• Built for high-heat environments

• Prevent exhaust gas blowback into the valve guide

Valve Seat Inserts

• Hardened for durability

• Press-fit into cylinder head during machine work

• Both intake and exhaust inserts available

Valve Springs

Valve springs control the timing and return motion of valves. Weak or fatigued springs can cause valve float, power loss, or even engine damage. Our valve springs for the ISB 4.5 are built to OE-equivalent tension ratings.

Features:

• Precision-wound for uniform pressure

• Suitable for both marine and land-based ISB 4.5 engines

• Compatible with factory valve train geometry

Cylinder Head Bolts

Cylinder head bolts play a crucial role in sealing the cylinder head to the engine block. Cummins engines require specific torque and stretch characteristics for proper installation. Our inventory includes two types of head bolts commonly used on ISB 4.5 engines.

Bolt Options:

• Short 70mm bolts: often used for compact heads or specific configurations

• Long 131mm bolts: used for full-depth clamping across the cylinder deck

Always replace cylinder head bolts during installation to ensure proper torque retention and to prevent head gasket failure.

Cylinder Head Gaskets and Upper Gasket Sets

To complete a top-end rebuild or cylinder head swap, a fresh set of gaskets is required. Diesel Pro Power offers complete upper gasket sets for Cummins ISB 4.5 engines to cover all sealing needs above the cylinder block.

Gasket Kit Contents:

• Cylinder head gasket (multi-layer steel or composite)

• Valve cover gasket

• Intake and exhaust manifold gaskets

• Injector seals

• Thermostat housing and coolant port seals

All gaskets are tested for durability under heat and pressure and made to resist coolant, oil, and combustion gases.

Valve Cover Gaskets

The valve cover gasket seals the top of the cylinder head, ensuring oil stays inside and contaminants stay out. A leaking valve cover gasket can lead to oil seepage and engine bay contamination.

Key Attributes:

• Formulated from advanced rubber compounds

• Cut precisely for the ISB 4.5 valve cover profile

• Resists shrinkage and hardening over time

Fuel System & Temperature Control Accessories

In addition to the cylinder head and valve components, we also supply additional upper engine parts that often require replacement during a top-end rebuild.

Fuel Manifold for ISB 4.5

• Ensures steady fuel delivery across injectors

• Compatible with ISB and earlier 4B engine platforms

Temperature Switch

• Compatible with Cummins, Detroit Diesel, and Caterpillar engines

• Activates at 205°F (96°C) for overheating protection

• 1/2" NPT thread size for universal sensor ports

When to Replace a Cylinder Head on a Cummins ISB 4.5

Knowing when to replace or rebuild a cylinder head is crucial. Here are some indicators your ISB 4.5 cylinder head may need service:

• Cracks between valves or coolant ports

• Warped surface causing blown head gaskets

• Excessive oil consumption due to valve seal failure

• Valve seat erosion or valve guide wear

• Overheating or loss of compression in one or more cylinders

If you experience any of these issues, replacing the cylinder head with a fully assembled unit can save time and restore factory performance without the need for machine shop work.

Why Choose Diesel Pro Power for Cummins ISB 4.5 Cylinder Heads

We offer more than just parts — we provide trusted service, expert guidance, and unmatched support:

• Fast worldwide shipping from our in-stock inventory

• Over 40,000 satisfied customers served across marine and industrial markets

• Detailed photos and technical descriptions to simplify your buying decision

• All heads and components backed by warranty and technical support

• Easy checkout and professional packing to ensure safe delivery

Expert Tip: Replacing Cylinder Heads with Confidence

When replacing your Cummins ISB 4.5 cylinder head, keep these best practices in mind:

1. Clean all mating surfaces thoroughly before installing the new head and gaskets.

2. Torque cylinder head bolts in the correct sequence and in stages to factory specifications.

3. Use new bolts and gaskets — never reuse torque-to-yield hardware or compressed gaskets.

4. Inspect coolant passages and oil galleries for clogs or signs of erosion.

5. Replace valve seals and verify valve lash clearance during reassembly.

These steps ensure long-term reliability and reduce the risk of premature failures.