Product Analysis: Common Rail Fuel Injector A6730170021 – Compatible with Delphi for Doosan 3.4 Engine
1. Basic Specifications & Parameters
The Common Rail Fuel Injector A6730170021 is a high‑precision diesel fuel injector designed to work with Delphi common rail systems found in Doosan 3.4L diesel engines. This injector is a direct replacement for the original Delphi unit, offering identical hydraulic and electronic performance for optimal combustion control.
Key technical parameters:
Part Number: A6730170021
Compatible Brand System: Delphi (Delphi common rail fuel injection system)
Engine Application: Doosan 3.4L (inline 4‑cylinder diesel)
Injector Type: Solenoid‑controlled common rail injector
Number of Nozzle Holes: 5 or 6 (depending on emission stage, typical 5 for Tier 3 / Stage IIIA)
Nozzle Hole Diameter: 0.120 – 0.135 mm
Flow Rate (static) : 380 – 420 cc/30 sec at 100 bar (test oil)
Maximum Injection Pressure: 1,600 bar (23,200 psi)
Coil Resistance: 0.8 – 1.2 Ω (at 20°C)
Injector Body Material: High‑strength alloy steel (magnetic circuit optimized)
Seat sealing type: Ball and seat (hardened)
Return fuel connection: Standard low‑pressure return fitting
OEM cross references: Delphi A6730170021, also known as 28279270 (some GM/Doosan applications)
Mounting: Two bolts with clamp (M6 x 45 mm)
Seal washer dimensions: 12.5 mm OD x 8.0 mm ID x 1.5 mm thick (copper or aluminum)
Each injector is 100% tested for:
Coil resistance and solenoid response time
Leakage (low pressure and high pressure)
Dynamic flow and return flow (at multiple pulse widths)
Spray pattern and atomization quality
2. Compatible Engines & Applications
The A6730170021 injector is designed for the Doosan 3.4L diesel engine family (inline 4‑cylinder, common rail). This engine is widely used across multiple industrial and vehicle applications.
Specific engine models:
Doosan D34 series (3.4L, Tier 3 / Stage IIIA)
Doosan G24 generator engine (3.4L base)
Doosan D34F (for forklifts and material handling)
Doosan D34T (turbocharged variant)
Typical equipment / applications include:
Industrial forklifts (Doosan, Bobcat, Clark, etc.) – models: Doosan D25S‑7, D30S‑7, D35S‑7 (with D34 engine)
Small construction machinery (skid steer loaders, mini excavators, compact wheel loaders) – Bobcat models using Doosan 3.4L engine
Agricultural tractors (small utility tractors)
Generator sets (prime/standby, 30–60 kVA range)
Material handling equipment (container handlers, reach stackers)
Marine auxiliary engines (small pleasure craft genset)
Important compatibility notes:
This injector is compatible with Delphi common rail systems – not with Bosch or Denso systems. Verify your engine’s injection system brand.
The Doosan 3.4L engine may also be branded as Daewoo in older equipment.
Always check the existing injector part number and the engine’s emission stage (Tier 3 / Stage IIIA vs. Tier 4 / Stage IIIB) – higher tiers may use a different injector.
For Doosan 3.4L Tier 4 Final engines (with higher pressure up to 2000 bar), this injector is not compatible.
3. Performance Advantages & Functional Improvements
Using a high‑quality aftermarket A6730170021 injector from Rsolid Engine Parts delivers tangible benefits compared to worn, rebuilt, or low‑quality units:
Restored Engine Power – Worn injectors lose flow accuracy and spray pattern quality. Our new injectors restore the original factory power output (up to 74 hp for naturally aspirated D34, 100 hp for turbo D34T). Customers report 10‑15% power recovery on high‑hour equipment.
Fuel Efficiency Improvement – Precision‑machined nozzle holes and calibrated solenoid valve reduce over‑fueling and leakage. Field data shows 5‑10% reduction in fuel consumption when replacing old or poorly rebuilt injectors.
Lower Emissions & Smooth Idle – Excellent atomization (Sauter mean diameter < 20 μm) ensures complete combustion, reducing white smoke at cold start and black smoke under load. This helps older engines pass emissions inspections.
Reliable Cold Start – The solenoid coil is tested for consistent pull‑in voltage down to 10.5 V DC, ensuring reliable starting in cold weather.
OEM Interchangeability – Dimensional and electronic parameters match Delphi A6730170021 exactly. No ECU recalibration required (plug‑and‑play if replacing same part number).
Long Service Life – The hardened ball seat and high‑strength alloy body resist wear from low‑quality fuel. Typical service life exceeds 6,000 hours in forklift or generator applications.
Protection Against Common Failures – New injectors eliminate issues such as:
Sticking solenoid (causing erratic idle)
Nozzle coking (uneven spray pattern)
Internal leakage (return flow too high, causing long crank)
Copper washer sealing failure (combustion gas in fuel system)
Installation tips:
Always replace sealing washers and O‑rings with new ones.
Use a torque wrench: injector clamp bolts to 25 Nm (18.4 lb‑ft).
After installation, perform a leak test at idleand then a reset of fuel trim values if the ECU supports adaptation (some Doosan ECUs auto‑adapt within 10 minutes of running).
Replace all injectors as a set for balanced cylinder performance, but single replacement is acceptable with proper coding (most Doosan 3.4L use non‑coded injectors – no coding required).
4. Why Choose Rsolid Engine Parts for This Common Rail Injector?
Rsolid Engine Parts (www.rinjector.com) is a specialist in diesel fuel injection components. When you purchase the A6730170021 injector from us, you benefit from:
Premium Quality – Our injectors are manufactured by an ISO 9001:2015 certified facility using Delphi‑compatible specifications. We do not sell used, repaired, or counterfeit units.
100% Tested Before Shipping – Each injector undergoes:
Coil resistance & inductance test
High‑pressure leak test (1,600 bar)
Dynamic flow test (5 test points from 200 to 1,600 bar)
Return flow measurement (< 0.5 cc/min at idle)
Spray pattern visual inspection (high‑speed camera)
Competitive Pricing – Direct sourcing allows us to offer 30‑50% savings compared to genuine Delphi or dealer prices.
Fast Global Shipping – Stock available for single injectors, sets of 4, or bulk orders. Express delivery via DHL/FedEx (3‑7 business days worldwide).
Technical Support – Have questions about compatibility, installation, or ECU adaptation? Our diesel specialists are available 24/7 via WhatsApp: +8615975376778.
Warranty – 12‑month warranty against manufacturing defects, solenoid failure, or nozzle seizure (under normal use and fuel quality).
Visit www.rinjector.com to explore our full range of common rail injectors, pumps, and nozzles for Delphi, Bosch, Denso, and Siemens systems. For urgent requirements, WhatsApp +8615975376778 now.
