OEM 129931-11700 cylinder head for Komatsu 4D94E 2.8L engines. High-nickel cast iron, pressure tested. Fits PC30-7, PC40-7. Bulk orders welcome ready
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Heavy-duty high-nickel cast iron cylinder head for Komatsu 4D94E and Yanmar 4TNE94 engines.
Engineered to prevent head cracking and deck warping under severe, high-vibration mini excavator operations.
OEM: 129931-11700 | Cross-reference: 129931-11000, YM129931-11700. Fits PC30-7, PC35, and PC40-7 excavators.
Bulk orders welcome.
The Komatsu 4D94E and Yanmar 4TNE94 engine platforms are highly reliable 2.8L to 3.1L inline-4 diesel powerplants powering compact utility machinery, including PC30-7, PC35, and PC40-7 mini excavators, WA30 wheel loaders, and D20P-7 dozers. At the combustion core of this compact inline-4 powertrain is the precision-engineered Komatsu 4D94E cylinder head (OEM 129931-11700, cross-reference 129931-11000, YM129931-11700, 129931-11020), designed to establish a gas-tight seal under high-frequency thermal cycles. In heavy-duty operations, mini excavator cylinder heads endure immense vibration stresses, commonly leading to thermal cylinder head cracking or deck warping across the valve seats. To eliminate these premature failures, our replacement 4D94E cylinder head is cast from premium high-nickel grey cast iron, providing vastly superior structural strength. Each unit is a core component of Komatsu 4D94E engine parts rebuilds, serving as a dependable Komatsu mini excavator cylinder head replacement for high-hour fleets. Our engineering team also supports related models like the 4D94LE cylinder head to guarantee long-term operation for global compact fleets. All cylinder heads undergo rigorous wet pressure testing at 10-bar pressures to identify micro-cracks before final assembly.
| Parameter | Value |
|---|---|
| Engine Code | Komatsu 4D94E / Yanmar 4TNE94 (2.776L / 3.053L) |
| Configuration | Inline-4 Cylinders, 8 Valves OHV |
| Cylinder Head Type | Fully Machined Bare Cylinder Head (4D94E bare head) |
| Material Specification | Premium High-Nickel Grey Cast Iron |
| Testing Standard | 100% Wet Pressure Tested (cylinder head pressure test) |
| Deck Flatness Tolerance | < 0.03 mm (CNC Surfaced) |
| Intake / Exhaust Valve Guide | Nitrided Hardened & Honed |
| Valve Seat Induction Hardness | HRC 50+ |
| Primary OEM Number | 129931-11700 |
| Interchange References | 129931-11000, YM129931-11700, 129931-11020 |
Our Komatsu engine components catalog covers the full light-duty and heavy-duty inline families, from the 2.8L 4D94E and 3.3L S4D95 to the massive 11.0L SAA6D125 and 15.2L S6D155 lines. Explore our complete range of Komatsu diesel engine parts by visiting our Komatsu Brand Hub or browse other specialized brands in our main Komatsu Cylinder Head Category.
4D94E Bare Head, 4D94E Yanmar Type Replacement, Industrial Diesel Engine Parts, Komatsu 4D94E Cylinder Head, Komatsu Engine Spares, PC40 Excavator Head
| Primary_Part_Number | Cross_Ref_Part_Numbers | Engine_Model | Machine_Model |
|---|---|---|---|
| 4D102 | PC100-6 PC120-6 | ||
| 6735-11-1020 | 6731-11-1370 | 6D102 | PC200-6 PC220-6 |
| 6D105 | PC200-3 PC220-3 | ||
| 6754-71-6320 | 6754-11-1101 | 6D107E | PC200-8 PC240-8 |
| 4D94E | PC30-7 PC40-7 PC45-7 | ||
| 129931-11700 | 129931-11000 | 4D94LE | PC40-7 PC50 Forklift |
| 4D95 | PC60-3 PC60-5 |
Komatsu cylinder heads fit heavy machinery including Komatsu PC30-7 Mini Excavator, Komatsu PC35R-8 Mini Excavator, Komatsu PC40-7 Mini Excavator, and Komatsu WA40-3 Compact Loader.
Contact us for complete application coverage.
| Make | Machine / Vehicle Model | Year Range | Engine Code | Cylinder Head OEM |
|---|---|---|---|---|
| Komatsu | PC30-7 / PC30R-7 Mini Excavator (PC30-7 cylinder head) | 1993–2001 | 4D94E Inline-4 | 129931-11700 |
| Komatsu | PC35R-8 / PC35-8 Mini Excavator (Yanmar 4TNE94 cylinder head) | 1998–2004 | 4D94E / 4TNE94 | 129931-11700 |
| Komatsu | PC40-7 / PC40R-7 Mini Excavator (PC40-7 cylinder head) | 1993–2001 | 4D94E Inline-4 | 129931-11700 |
| Komatsu | WA40-3 / WA50-3 Compact Loader | 1996–2003 | 4D94E Inline-4 | 129931-11700 |
Heavy load utility operations combined with localized hot spots break down the cooling efficiency across the valve bridge. This creates severe thermal fatigue, leading to cylinder head cracking between valve seats and oil contamination. (cylinder head cracking)
Solution: Replace the compromised casting with a premium high-nickel cast iron cylinder head (OEM 129931-11700 equivalent) and always replace the head bolts during overhaul.
Symptom: Combustion gas bubbles in the radiator, oil leaks at the block face, or rapid gasket blowout shortly after initial engine startup. (cylinder head warping)
Diagnosis: Mismatched or unevenly torqued head bolts stretch the casting out of alignment, causing deck warping and eliminating the gasket seal.
Solution: Ensure the block face is perfectly flat, and torque the head bolts starting from the center outward in three progressive stages to 85-90 Nm (63-66 lbf·ft).
Symptom: Sweet-smelling exhaust smoke, coolant dripping down the block face, or oil emulsification during warm-up.
Diagnosis: Rebuilding with a warped engine block, reusing old stretched head bolts, or failing to run a proper pressure test allows coolant to bypass the head gasket.
Solution: Always verify block deck flatness, use new high-tensile head bolts, and select a premium cylinder head assembly that has undergone a certified 10-bar pressure test before installation.
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For Cylinder Head: Gaskets, valves, bolt kits available. Part number required for final confirmation.
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