129931-11700 cylinder head for Komatsu 4D94LE 3.1L engines. Fits PC50 & WA50. High-nickel cast iron prevents warping. Global shipping available
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Heavy-duty low-emission cylinder head for Komatsu 4D94LE and Yanmar 4TNV94 engines.
Features CNC deck machining and high-nickel gray cast iron to comply with environmental regulations and prevent valve guide wear.
OEM: 129931-11700 | Cross-reference: 129931-11000, YM129931-11700. Fits PC50MR-2 excavators and WA50 loaders.
Global shipping available.
The Komatsu 4D94LE and Yanmar 4TNV94 engine platforms represent the eco-compliant 3.1L inline-4 diesel evolution (3,053 cc), specifically designed to meet stricter environmental emissions regulations. To maintain stable compression and lower carbon outputs, the Komatsu 4D94LE cylinder head (OEM 129931-11700, cross-reference 129931-11000, YM129931-11700) integrates advanced valve-guide and seat geometries. Operating under continuous duty in tight, zero-swing engine bays, this low emission cylinder head must endure extreme heat concentration. If neglected, issues such as cylinder head valve guide wear or deck warping can cause power loss and exhaust smoke. To prevent these failures, each casting is machined from premium high-nickel gray cast iron, matching original Yanmar tolerances. This complete head assembly is a vital component of Komatsu 4D94LE engine parts overhauls, providing robust structural durability for WA50 loaders, PC50MR-2 compact loaders, and PC40-7 cylinder head replacements. All units undergo meticulous CNC deck machining to achieve flat tolerances below 0.03 mm, ensuring a perfect, gas-tight combustion seal on the engine block.
| Parameter | Value |
|---|---|
| Engine Code | Komatsu 4D94LE / Yanmar 4TNV94 (3.053L) |
| Configuration | Inline-4 Cylinders, 8 Valves OHV |
| Cylinder Head Type | Fully Machined Bare Cylinder Head (4D94LE bare head) |
| Material Specification | Premium High-Nickel Grey Cast Iron |
| Deck Surfacing standard | CNC Machined Deck (< 0.03 mm Flatness) |
| Testing Standard | 100% Wet Pressure Tested (cylinder head pressure test) |
| Intake / Exhaust Valve Guide | Nitrided Hardened & Honed |
| Valve Seat 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.
| 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 PC50MR-2 Excavator, Komatsu PC55MR-3 Excavator, Komatsu WA50 Wheel Loader, and Komatsu PC40-7 Mini Excavator.
Contact us for complete application coverage.
| Make | Machine / Vehicle Model | Year Range | Engine Code | Cylinder Head OEM |
|---|---|---|---|---|
| Komatsu | PC40-7 / PC40R-7 Mini Excavator (PC40-7 cylinder head) | 1993–2001 | 4D94LE Inline-4 | 129931-11700 |
| Komatsu | PC50MR-2 / PC50MR-2-A Mini Excavator (PC50 cylinder head) | 2004–2008 | 4D94LE / 4TNV94 | 129931-11700 |
| Komatsu | PC55MR-3 / PC55MR-3-A Mini Excavator | 2008–2015 | 4D94LE / 4TNV94 | 129931-11700 |
| Komatsu | WA50-3 / WA50-3-A Compact Loader (WA50 cylinder head) | 1996–2005 | 4D94LE Inline-4 | 129931-11700 |
Symptom: Mismatched emissions values, rough idling, or mechanical interference during a rebuilt engine initial startup. (4D94E vs 4D94LE)
Diagnosis: Though both share the basic 129931-11700 casting and fit physically, the 4D94LE features slightly different valve recessions and guide clearances to support high-efficiency combustion for low emission regulations.
Solution: They are physically interchangeable, but rebuilding to S4D95 or 4D94LE standards requires using the exact valve and seal components matched to your engine spec serial number.
Symptom: High oil consumption, blue smoke from the exhaust under load, and valve noise. (cylinder head valve guide wear)
Diagnosis: Extended high-temperature operations cause carbon buildup on the valve stem, which physically scores the soft internal guide walls.
Solution: Replace the guide with our nitrided, micro-honed guides and install premium viton stem seals to restore precise valve vertical motion.
Symptom: High downtime during major overhauls due to transferring or grinding old valves. (4D94LE bare head)
Diagnosis: Bare heads contain only the cast structure, requiring full machinist assembly; complete heads are pre-loaded with valves and spring guides.
Solution: We supply both bare castings and complete, pre-assembled configurations to meet distinct workshop repair schedules.
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For Cylinder Head: Gaskets, valves, bolt kits available. Part number required for final confirmation.
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