2Q91 / BH2Q85R8 – Fuel Injection Pump For Lijia SL2110ABT Diesel Engine

For workshops and parts distributors serving heavy-duty equipment in Africa and Southeast Asia, the KANGDA 2Q91 (model BH2Q85R8) represents a dependable replacement solution for the Lijia SL2110ABT power unit. This twin-cylinder mechanical injection pump is rated to support 17.5 kW at 2300 RPM, matching the factory fuel delivery curve for agricultural tractors, small gensets, and earth-moving machinery still widely operational across developing markets. Unlike electronically governed common rail systems, this unit relies on a mechanical centrifugal governor, offering straightforward field servicing without proprietary diagnostic interfaces.

The BH2Q85R8 employs an in-line pump design with a plunger diameter of 8.5 mm, delivering sufficient fuel volume per stroke for sustained low-end torque. Its mechanical governor assembly directly controls the control rack, adjusting fuel quantity in response to engine load variations. This construction is particularly advantageous for diesel fuel injection repair shops in remote areas, as the pump can be disassembled, cleaned, and recalibrated using basic bench tools. The delivery valve holder and plunger barrel are manufactured from case-hardened steel, resisting wear from low-sulphur diesel commonly found in emerging markets. The pump's mounting flange follows the Lijia bell housing pattern, ensuring that the drive shaft coupling and timing gear mesh align without additional adaptor plates.

This pump carries the 2Q91 order number, which is the definitive reference for matching to the Lijia SL2110ABT – a naturally aspirated, two-cylinder diesel engine used extensively in 30-40 HP tractors from brands like Dongfeng and Jinma, as well as stationary generator sets. The governor spring settings, idle fuel limiting screws, and maximum speed stops are pre-calibrated to Lijia's original 2300 RPM rated speed, eliminating the need for post-installation tuning. For diesel engine parts suppliers stocking inventory for Asian and African agricultural fleets, the BH2Q85R8 is a high-turnover SKU due to the engine's prevalence in rice-growing regions and small-scale construction projects.

When fitting the KANGDA 2Q91 onto an SL2110ABT, the critical step is establishing correct static injection timing. The timing mark on the pump drive gear must align with the corresponding mark on the engine timing gear case; any deviation of even one gear tooth will cause retarded or advanced injection, leading to power loss or detonation. The high-pressure fuel pipes connecting the pump delivery valves to the injectors must be tightened to the correct torque and free from kinks or restrictions, as these directly affect injection pressure build-up. After the mechanical installation, the fuel system must be primed by loosening the delivery valve holder nuts and cranking the engine until fuel flows without air bubbles. For diesel injection service professionals, adjusting the idle speed screw to approximately 650–700 RPM and the maximum fuel stop screw to the factory-specified rack travel ensures the engine responds cleanly under sudden load applications, which is common in milling or water-pumping tasks.

The BH2Q85R8 is engineered for long operational intervals under dusty and high-ambient-temperature conditions, provided that fuel filters are replaced every 250 operating hours. The most common failure points – plunger scoring, delivery valve seat erosion, and governor weight pivot wear – are all addressable through readily available overhaul kits. Compared to common rail fuel injection systems that demand high-pressure test benches and laptop calibration, this mechanical pump can be fully rebuilt in a local workshop within two hours, significantly reducing machine downtime. For wholesalers and fleet managers, the total cost of ownership is notably lower because the pump does not require specialized electronic diagnostic tools or proprietary software updates. 

Q1: How to verify the BH2Q85R8 fits my Lijia engine?
A: Check the engine block stamp for SL2110ABT and measure the two mounting studs at 72 mm centre distance. Also confirm your old pump shows order number 2Q91 – this KANGDA unit is a direct drop-in replacement.

Q2: Will this pump work with B20 biodiesel?
A: Yes, B20 is acceptable. For B30 blends, monitor the accelerator shaft seal and governor diaphragm for swelling. KANGDA uses nitrile seals rated for up to 20% bio-content.

Q3: What spare parts should we stock for field repairs?
A: Prioritise a plunger and barrel set (8.5 mm), delivery valve pairs, and a governor spring kit – these cover the vast majority of roadside failures.

Q4: How to correct erratic idling after installation?
A: Bleed the system first. If hunting persists, check the governor spring length against spec and ensure the control rack slides freely – carbon debris from old fuel lines often causes sticking.

Q5: Can this pump be adjusted for high-altitude operation?
A: Yes. Above 1500 metres, slightly back out the maximum fuel stop screw and retard static timing by 0.5–1 degree to reduce smoke. Contact us for a detailed altitude calibration chart.