YC6JA Diesel Injector
Cross-Reference & Technical Specs
Authoritative technical specifications, verified Bosch part numbers, control valve stamping codes, and nozzle spray orifices for the YC6JA diesel engine family.
All Verified Part Numbers for YC6JA
The following 1 common-rail injector assembly is calibrated for this engine family. Click the SKU to view individual test bench flow curves, sister cross-references, and vehicle applications.
| Part Number (SKU) | Primary OE Reference | Control Valve | Nozzle Code |
|---|---|---|---|
| 0445120164 → | A60001112100A38 | F00RJ02806 (solenoid-actuated, common rail metering) | DLLA150P1827+ (stamped, 5+ sources confirm) |
Verified Vehicle Compatibility
| Make / Manufacturer | Vehicle Model & Platform | Engine Specification | Model Years |
|---|---|---|---|
| Golden Dragon (Xiamen Golden Dragon Bus Co., Ltd.) | XML6102J | Yuchai YC6JA / YC6J series, 6.87-6.9L 6-cyl 132-191 kW / 180-260 hp | 2010-2020s (XML6102J58S, XML6102J18Z, XML6102J15C and similar batches) |
| Golden Dragon (Xiamen Golden Dragon Bus Co., Ltd.) | XML6122J | Yuchai YC6JA / YC6J series, 6.87-6.9L 6-cyl 132-191 kW / 180-260 hp | 2010-2020s (12 m luxury coach platform) |
| King Long (Xiamen King Long United Automotive Industry Co., Ltd.) | XMQ6106B / XMQ6998 | Yuchai YC6J245-50 / YC6J230-30 / YC6JA series, 6.87-6.9L 6-cyl 132-191 kW | 2014-present (XMQ6106BGD5 batch #274 onward) |
| Higer Bus (Suzhou Higer Bus Co., Ltd.) | Higer KLQ-series 8-11 m road buses | Yuchai YC6JA / YC6J, 6.87-6.9L 6-cyl 132-191 kW / 180-260 hp | 2010s-2020s (per chinax-balin.com cross-reference) |
| Yuchai-direct applications (medium cargo and dump trucks) | 4x2 / 6x2 medium cargo truck / dump truck | Yuchai YC6JA-30 / YC6JA-50 series (per Yuchai official product parameters) | 2010-present (Euro III / Euro V variants) |
| School bus applications | 9-10 m school bus platforms (multiple OEM chassis including Golden Dragon XML6722J18C, King Long XMQ6-series) | Yuchai YC6JA / YC6J, 6.87-6.9L 6-cyl 132-191 kW | 2014-present (per Yuchai official application range) |
Installation, Tightening Torque & Re-torque Protocol
Strict torque compliance is mandatory on YC6JA common-rail cylinder heads. Over-torquing stretches the injector body or strips the head clamping threads, while under-torquing allows combustion blow-by past the copper sealing washer:
- Hold-down clamp bolt: no family-specific value published for YC6JA — consult the OEM service manual. Always clean the cylinder head recess with an injector seat reamer.
- High-pressure rail flare nut: 25–30 N·m using a dedicated 17 mm line wrench.
- Return leak-off banjo bolt: 9–12 N·m with fresh copper washers on both sides of the banjo union.
After fitting replacement injectors on YC6JA, generate or program the cylinder-specific IMA calibration code into the engine ECU using an OEM-level scan tool (Bosch KTS, Renault CLIP, or VAG-COM) to prevent cylinder power imbalance and rough idle.
Technical Diagnostics FAQ for YC6JA
What DTC fault codes indicate a failing injector on YC6JA?
The most frequent fault codes are P0201 through P0204 (Injector Circuit Malfunction on Cylinders 1–4), P2146/P2149 (Injector Group Supply Voltage Error), and P0087 (Fuel Rail Pressure Low due to excessive internal leak-off). Measure solenoid coil resistance across the pins (0.5–1.5 Ω) and perform a graduated-bottle dynamic leak-back test to pinpoint the leaking cylinder.
Can sister SKUs within the YC6JA family be interchanged?
Not unless explicitly confirmed on the vehicle build plate. While sister SKUs share the same physical outer envelope and F00RJ02806 (solenoid-actuated, common rail metering) control valve, they differ in nozzle spray orifice angle and factory IMA flow calibration. Mixing sister SKUs on the same engine block can trigger rough idle, elevated exhaust gas temperatures (EGT), and MOT emissions failure.