KANGDA 2Q72 / BH2Q85R8 – Direct-Fit Injection Pump For TY2100I Power Units

Engineered for the Jiangdong TY2100I industrial diesel, the KANGDA 2Q72 (BH2Q85R8) injection pump delivers metered fuel at 2400 RPM to sustain 20.6 kW continuous output. This mechanical in-line unit features an 8.5 mm plunger and centrifugal governor, tailored for constant-speed generator sets and agricultural tractors. Unlike generic replacements, this pump retains factory timing calibration-18° BTDC static-and includes an automatic advance mechanism that adjusts up to 6° as engine speed climbs. For workshops handling compact utility vehicles, this model eliminates guesswork: the mounting flange matches the original gear housing without spacers, and the delivery valve design minimizes secondary injection, directly improving thermal efficiency during prolonged low-load operation.

The ordering code 2Q72 pairs with pump casting BH2Q85R8-both numbers must match for warranty validation. Plunger stroke measures 8.0 mm, delivering 72 mm³/stroke at rated speed. Injection pressure ranges from 35 MPa to 42 MPa at the delivery valve, compatible with standard nozzle opening pressures. The governor incorporates a torque spring for low-speed lugging resistance, critical for generator sets facing sudden load changes. All sealing elements use nitrile rubber, rated for biodiesel blends up to B20. Mounting hardware: 4-hole M8x1.25 pattern on 85 mm centers, with a 5 mm x 5 mm drive keyway. Replacement gaskets and copper washers are included in the package, but high-pressure lines remain engine-specific-retain existing tubing.

Primary fitment targets the Jiangdong TY2100I-a 2.0L two-cylinder diesel found in 25–35 HP tractors, 20 kVA generator carts, and rice transplanters across Asian and Latin American markets. Secondary compatibility extends to Changchai ZS1115 and Lovol 2100 series with minor governor linkage tweaks. European workshops can substitute this pump for obsolete Bosch VE distributor units on compact loaders, provided drive flange dimensions align. The governor curve is pre-set for constant-speed operation, making it ideal for standby power applications where frequency droop must remain within ±2.5%. For aftermarket distributors, this single SKU covers over a dozen OEM machine models, reducing inventory complexity for rural dealerships serving mixed fleets.

Before mounting, verify drive gear backlash stays under 0.12 mm. Rotate engine to TDC compression for cylinder #1, then align the pump flange mark with the gear housing pointer. Insert a 4 mm dial gauge into the side cover witness hole-plunger lift must read 1.25 mm at the specified static angle. Tighten flange nuts to 35 Nm using a cross-sequence pattern; always fit new copper washers on all high-pressure outlets. Bleed the system by loosening injector-end lines while cranking-limit starter runs to 10 seconds to avoid overheating. During first start, hold throttle at 50% and idle for 3 minutes to expel trapped air. Never apply silicone sealant to the pump-to-housing gasket; use only non-hardening compound. Excess sealant can block return spring orifices, causing erratic surging. 

Though purely mechanical, this pump influences downstream fuel behavior when retrofitted into low-pressure common-rail conversions. In such setups, the BH2Q85R8 acts as a feed pump, sustaining 5–7 bar inlet pressure to the rail accumulator. For standalone use, its delivery valve reduces secondary injection, lowering exhaust gas temperature by nearly 40°C-a measurable benefit for generators running 80% load continuously. Field data indicates that a correctly calibrated unit extends injector nozzle life from 1,500 to 2,200 hours, attributed to stable pressure ramp rates (0.08 MPa/°CA). Internal components-plunger, barrel, delivery valve, and governor weights-remain serviceable with standard workshop tools; no hydraulic press needed. Compared to unbranded clones, the KANGDA OEM part features cam roller pins hardened to HRC 58–62, resisting pitting beyond 3,000 hours. Rebuilding this pump costs roughly one-fifth of a full injection system replacement, offering fleet operators a clear economic advantage while maintaining OEM-grade reliability.

Q1: Will this pump require recalibration when switching from summer to winter diesel?
A: No-viscosity changes within standard limits are automatically compensated by the centrifugal governor. However, always replace the fuel filter before winter to prevent wax restriction, which can starve the feed side.

Q2: What symptoms indicate a failing delivery valve on this model?
A: Hard starting when hot, audible knocking at idle, and black smoke under acceleration. A quick leak-down test on the high-pressure line-if pressure drops faster than 2 MPa per minute, replace the valve holder assembly.

Q3: Can I install this pump on an engine with a worn camshaft?
A: Not recommended. Cam lobe wear exceeding 0.15 mm will alter timing irreversibly. Always measure lobe lift with a dial indicator before fitting-otherwise, performance and fuel economy will suffer.

Q4: How does the 12-month warranty apply to pumps used in rental fleet applications?
A: The warranty covers manufacturing defects regardless of usage intensity, provided the pump is installed with the supplied gaskets and torque specs. Rental fleets are eligible, but abuse (over-speeding or contaminated fuel) voids coverage.

Q5: What is the correct procedure for long-term storage of a spare pump?
A: Drain all diesel, coat internal surfaces with light rust-preventive oil, seal all ports with plastic caps, and store in a dry environment (relative humidity below 60%). Rotate the drive shaft monthly to redistribute lubricant on bearings.

Q6: Is the automatic advance mechanism adjustable independently?
A: No-it's factory-set and sealed. Tampering requires a test bench. If you suspect advance malfunction, check governor spring tension and flyweight wear first, as these are common failure points.