2Q73 | BH2Q85R8 – Fuel Pump For Lijia 2110 Diesel Engines

When a 21.6 kW auxiliary unit sits idle for two extra days because of injection hesitation, the repair bill is not just the pump – it is the lost rental revenue, the overtime paid to the fitter, and the customer who will not return next season. The KANGDA 2Q73 (BH2Q85R8) exists to shut down those compounding losses. Designed specifically for the Lijia 2110 block at 1800 rpm, this mechanical inline pump eliminates the guesswork of second-hand cores and dimensionally mismatched alternatives. Every unit leaves the bench with a test certificate showing plunger lift, delivery-valve seating torque, and internal leakage figures – so your workshop installs once, bills once, and moves to the next bay without callback anxiety.

The pump carries a BH2Q85R8 element with 8.5 mm plunger diameter, 8 mm stroke, and outlet pressure peaking at 62 MPa under full rack. Flange hole spacing is 102 mm centre-to-centre, matching the Lijia bell-housing without filing or shimming – a detail that saves your technician at least 25 minutes of fiddling. Overall length sits at 285 mm, dry weight 6.8 kg, and the inlet thread is M22×1.5 while outlets are M18×1.5. Torque specs are fixed: delivery valve holders at 55–60 Nm, flange bolts at 38–42 Nm in a cross sequence. These are not optional recommendations; they are the thresholds between a one-hour job and a three-hour rectification because of stripped threads or weeping joints.

This unit is profiled for the 2110 naturally aspirated and low-boost turbo variants used in compact tractors, skid-steer loaders, and stationary generator sets up to 21.6 kW. Primary OEM fitment remains Lijia 2110, with proven interchangeability on Changchai 2110 and Xichai 2105 platforms sharing the same drive-coupling offset. The pump delivers 52–55 mm³/stroke at rated speed – a flow window that keeps combustion stable without over-fuelling the bearings. For workshops serving mixed fleets, stocking this single SKU covers three engine families, cutting the shelf space needed for separate inventory lines.

Before bolting, check the drive gear backlash – acceptable range is 0.08–0.12 mm. Anything outside that invites tooth chatter and premature drive-shaft wear. Rotate the crank to TDC compression on cylinder No.1, align the flange mark with the housing pointer, and slide the pump in with a fresh O-ring. Prime the low-pressure side by cracking the inlet banjo until clear fuel escapes, then torque to 25 Nm. Static timing must be 18° BTDC; confirm with a dial gauge showing 0.35 mm plunger lift at the mark. Idle for 3 minutes, re-torque the delivery holders while warm – this single step reduces post-installation seepage calls by over 60% in field records.

Mechanical inline pumps on the 2110 platform rarely fail catastrophically – they degrade slowly, causing hard starts, erratic idling, and black smoke that sends drivers back to your gate. Data from independent diesel workshops indicate that over 70% of these complaints trace to plunger clearance exceeding 0.04 mm, not nozzle wear. Swapping the pump restores cylinder-to-cylinder fuel balance within ±2%, eliminating misfire that accelerates main bearing fatigue. For a repair business, this translates into predictable job times: under 4 hours from drop-off to test-run, compared to 3 days if the customer opts for external machining. The cast-iron housing also withstands sustained ambient heat up to 95 °C inside generator enclosures, so you are not dealing with thermal distortion comebacks during summer peak loads.

Q1: For a workshop serving 30+ Lijia-powered units, what is the recommended bulk order cycle?
A: We advise ordering in packs of 4 units to cover seasonal peak failures. Typical replacement intervals on continuous-duty generator sets fall between 4 500 and 5 500 hours – adjust your stock based on your fleet's average annual runtime.

Q2: Have these pumps been validated on engines with aftermarket injector nozzles?
A: Yes, we have run over 200 test hours on engines fitted with third-party nozzles from two major aftermarket brands. The delivery-valve sealing and plunger response remained within factory tolerance bands across all trials.

Q3: What is the most common installation error that leads to premature return?
A: Skipping the warm re-torque of delivery holders. Our returns analysis shows that nearly 45% of early seepage cases trace back to this single missed step – not component defect.

Q4: Can we expect consistent flow balance if we rotate this pump across different 2110 serial numbers?
A: Yes. The flange and drive-coupling dimensions are standardised across Lijia's 2110 production run from 2015 onward. We recommend noting the governor spring free length during each swap – it is the only variable that may require minor adjustment.

Q5: How does storage humidity affect shelf life beyond the 24-month label?
A: In unopened packaging, the internal anti-corrosion coating protects plunger surfaces up to 60% RH. For humid coastal shops, we suggest adding a desiccant bag inside the storage box if holding stock beyond 18 months.