Cat C9 Cylinder Head Assembly — E320d / E336d Excavator OEM 2733034 3323619

This cylinder head assembly is manufactured for the Caterpillar C9 6-cylinder diesel engine (OEM part numbers 2733034, 2134360, 2523439, 3323619), the powerhouse behind the Cat E320d and E336d excavator platforms, D6R/D6T track-type tractors, and a range of industrial and marine applications. The Cat C9 engine is an 8.8-liter inline-6 with ACERT technology — a high-performance, electronically controlled platform that places extraordinary demands on the cylinder head. It must seal six high-compression combustion chambers, accommodate a 24-valve overhead camshaft valve train, resist thermal cycling from cold starts to sustained full-load operation at 200+ kW, and maintain perfect flatness for the MLS head gasket under boost pressures exceeding 30 psi. A failed C9 head — typically from cracking in the injector sleeve area, warpage from overheating, or exhaust valve seat damage — requires a quality replacement assembly to restore engine performance and reliability.

Cast from high-grade alloy iron using precision sand-casting processes, this cylinder head replicates every critical feature of the original Caterpillar component. The deck surface is CNC-ground to a flatness tolerance of less than 0.03mm across its full length, essential for the multi-layer steel head gasket to maintain a combustion seal under the C9 peak cylinder pressures. All 24 valve seats are precision-machined with multi-angle profiles for maximum volumetric efficiency and heat transfer, and valve guides are reamed to Caterpillar OE specifications for proper stem-to-guide clearance. Injector sleeves, unit injector bores, glow plug threads, and all manifold mounting surfaces are machined to factory tolerances. Each head receives a mandatory hydraulic pressure test of coolant passages and oil galleries to verify casting integrity before dimensional final inspection.

Direct replacement for Cat C9 engines in Caterpillar E320d, E324d, E329d, E336d excavators; D6R, D6T track-type tractors; 972H/980H wheel loaders; and industrial/ marine C9 applications. Always install with a new OEM-spec MLS head gasket, new head bolts (torque-to-yield design), and new manifold and injector O-ring seals. The C9 head bolt torque procedure uses a precise multi-stage angle-tightening sequence — follow the Cat service manual strictly. For related engine components, browse our engine parts collection. Reference OEM specifications at Caterpillar Industrial Engines official page.

Technical Specifications

• SKU: CAT-C9-CH-2733034
• OEM Numbers: 2733034 / 2134360 / 2523439 / 3323619
• Type: Complete Cylinder Head Assembly — 24-Valve OHC
• Material: High-Grade Alloy Cast Iron, CNC Machined, Pressure Tested
• Fitment: Caterpillar C9 8.8L ACERT 6-Cylinder Diesel Engine
• Application: Cat E320d-E336d Excavators, D6R/D6T Dozers, 972H Loaders

Compatible Caterpillar Equipment

Kingstream Cat C9 cylinder heads are individually pressure-tested with full QC documentation, oil-misted on all machined surfaces, vacuum-sealed in heavy-gauge VCI barrier film, and packed in high-density custom-molded foam within a reinforced wooden crate for safe international freight. 12-month warranty against casting and machining defects. Contact us with your engine serial number for fitment verification, freight quotes, and bulk pricing.