Kawasaki 70Z-II, 70Z-III & 70Z-IV Cylinder Head Reman - Daily Driver (5.9L 12V)

Part Number / SKU: CEP59KA12VDHR

Get your Kawasaki wheel loader back to work with an OEM-spec cylinder head engineered specifically for the rigorous demands of industrial operation. This Daily Driver tier cylinder head for the 5.9L 12-valve engine is assembled using a renewed, pressure-tested OEM core combined with brand-new, high-quality internal components to guarantee reliable operation, maximum uptime, and long-term durability on the job site.

Premium Component Breakdown

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

• New Wear Components: Equipped with all-new, high-quality valve seats, valve seals, and valve guides.

Key Features and Heavy-Duty Fixes

This head features critical durability upgrades backed by an intense inspection protocol to guarantee every industrial specification is met.

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

• Blow-Proof Plugs: Threaded, blow-proof plugs are installed in the top of the head for increased security, preventing the common leaks associated with pressed-in factory plugs under severe thermal stress.

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

  • Valve Recessions

  • Stem heights

  • Installed spring heights

  • Spring pressures

  • Keeper and lock positions

  • Roughness Average (RA) Finish

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

Precision Machining Process

Aero Engines Inc has incorporated critical modifications to address common failure points of the factory 5.9L cylinder heads, drastically improving field reliability:

• Optimal Sealing Surface: The deck is resurfaced to meet or exceed OEM specifications for Roughness Average (Ra), maximizing head gasket sealing performance to withstand continuous thermal cycling.

• Valve Train Geometry Alteration: The head is custom blueprinted to alter valve height and valve recession, achieving maximum durability under continuous duty.

• Lifter and Valve Train Longevity: Valve stem heights are precisely altered to optimize valve train geometry. This crucial modification decreases wear and significantly extends the life of the lifters and camshaft.

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

• Valve Prep: Valves are reground and margins are meticulously inspected to guarantee a flawless seal against the new seats.

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

Meticulous Cleaning and Prep Process

Quality begins before machining with an intensive cleaning and stress-relieving process to ensure a flawless starting point:

• Magnetic Particle Inspection (MPI): Each core is subjected to MPI testing to thoroughly check for any cracks or subsurface imperfections.

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

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

• Thread Prep: All broken bolts and studs are professionally removed, leaving all threads clean, chased, and ready for a seamless installation on your loader.