Universal Fitment Across All Komatsu "Dash" Configurations: Engineered for the co-developed Komatsu SAA6D107E. This cylinder head provides complete casting and accessory hole compatibility across all emission iterations and machine generations, including Tier 3 (Dash-8 excavators, Dash-6 wheel loaders, Dash-22 dozers), Tier 4 Interim (Dash-10 series), and Tier 4 Final / Stage V (Dash-11 excavators, Dash-7/Dash-8 loaders, Dash-24 dozers). Whether your machine utilizes early Cooled EGR or advanced late-model DPF/SCR emission systems, this casting matches original physical footprints exactly.

Maximize machine uptime and safeguard your equipment against head gasket failures during extended production shifts. The Workhorse tier cylinder head for Komatsu SAA6D107E series engines is specifically engineered for sustained heavy-duty material handling, continuous digging cycles, and intense thermal loads. Assembled using a renewed, pressure-tested OEM core combined with brand-new, premium internal components, this cylinder head integrates heavy-duty structural upgrades to handle elevated cylinder pressures and eliminate common field failures on the job site.

Upgrades Over the Daily Driver: Precision O-Rings

Modern emissions regulations and Cooled EGR systems subject the Komatsu 107E engine to extreme thermal strain, making rapid thermal expansion the leading cause of head gasket blowouts in production machinery. The Workhorse model eliminates this vulnerability by featuring precision-cut O-rings machined directly into the deck surface. This mechanical modification locks the head gasket securely in place, drastically improving sealing under high cylinder pressures and severe operating temperatures to guarantee zero combustion leaks and prevent costly operational downtime.

Components and Parts

• Remanufactured Casting: Built from a high-quality OEM core casting that has passed rigorous magnetic testing and is machined to like-new industrial specifications.

• Precision O-Rings: To combat the severe thermal expansion common in modern high-torque heavy equipment, precision O-rings are machined directly into the deck surface. This mechanical modification locks the head gasket securely in place, completely eliminating the risk of combustion leaks under extreme operating loads.
• New Wear Components: Equipped with all-new, high-quality valve seats, valve seals, and valve guides.

Key Features and Heavy-Duty Fixes

This industrial-grade head features critical durability updates, backed by an intense inspection protocol to guarantee every commercial specification is met.

• 40 PSI Pressure Testing: Following all machining work, every cylinder head is pressure-tested at 40 PSI to confirm zero leaks and ensure complete casting integrity before it ever reaches your machine.

• Blow-Proof Plugs: Threaded, blow-proof plugs are installed in the top of the head for superior leak prevention, replacing standard factory pressed-in plugs that are prone to failure during severe thermal cycles.

• Final Quality Control: The head undergoes an extensive final cleaning and strict inspection process. A detailed sign-off sheet is generated, measuring and recording critical specifications using a profilometer, including:

  • Valve Recessions

  • Stem Heights

  • Installed Spring Heights

  • Spring Pressures

  • Keeper and Lock Positions

  • Roughness Average (RA) Surface Finish

 Recording this rigorous validation process ensures you receive a cylinder head that is significantly improved over the original factory design and ready for years of demanding operation.

Precision Machining Process

Choate Engineering Performance has incorporated critical modifications to address common failure points of factory 6.7L industrial cylinder heads, drastically improving field reliability:

• Optimal Sealing Surface: The deck is resurfaced to meet or exceed OEM specifications for Roughness Average (Ra), maximizing the sealing surface performance for the head gasket under modern high-injection-pressure loads.

• Valve Train Geometry Alteration: We custom blueprint the 6.7L head to alter valve height and valve recession, achieving maximum durability for high-cycle industrial applications.

• Lifter and Crosshead Longevity Fix: Valve stem heights are precisely altered to remove excessive preload on the hydraulic lifter. This crucial modification decreases wear and significantly extends the life of the lifters, crossheads, and camshaft under constant high workloads.

• Optimized Flow and Sealing: Valve seats are cut with a precise three-angle profile to optimize combustion efficiency and ensure a perfect seal.

• Valve Prep: Valves are reground and margins are meticulously inspected to guarantee proper sealing against the new seats.

• All-New Wear Components: New valve stem seals, valve seats, valve guides, and injector cups are installed across the entire assembly.

Meticulous Cleaning and Prep Process

Our commitment to quality begins before machining, with an intensive cleaning and stress-relieving process to ensure a flawless starting point:

• Rigorous Inspection (MPI): Each core is subjected to Magnetic Particle Inspection (MPI) to thoroughly check for any cracks or subsurface imperfections common in high-hour castings.

• Thermal Stress Relieving: The head undergoes a stress-relieving process in a specialized furnace to bake away residual industrial oils and grease by turning them into ash.

• Material Relaxation: The head is shot-blasted to strip rust and scale, a crucial step that relaxes the cast iron before any precision machining begins.

• Thread Prep: All broken factory bolts and studs are professionally removed to ensure threads are clean, chased, and ready for a seamless installation.