KANGDA 2Q70 / BH2Q85R8 In-Line Fuel Pump For Jiangdong 2110

Precision fuel metering for the Jiangdong 2110 diesel block, this KANGDA 2Q70 (ordering code) with pump head BH2Q85R8 delivers 38 kW output at 3000 RPM. Engineered as a direct mechanical replacement, this unit governs injection timing and quantity across varying operational loads. Workshops confronting erratic idling, smokey exhaust, or lagging power on agricultural machinery will recognise this pump as the primary culprit. Its robust governor assembly and hardened plunger barrel tolerate the torsional stress common in three‑cylinder tractor powerplants, making it a workshop favourite for overhauls and preventative swaps.

This assembly pairs the 2Q70 housing with the BH2Q85R8 hydraulic head, specifying a plunger diameter of 8.5 mm and a stroke calibrated for the 2110's swept volume. Static injection timing must be locked at 25° BTDC (before top dead centre) using the flywheel mark; any deviation alters combustion pressure and raises exhaust gas temperatures beyond safe limits. The mechanical governor incorporates a flyweight assembly that modulates fuel delivery from idle to rated speed, maintaining consistent rail pressure without electronic intervention. Shaft end‑play should not exceed 0.03 mm to preserve timing accuracy. The delivery valve holder torque setting is 45 Nm-under‑torquing invites external seepage, while over‑torquing distorts the valve seat and shortens component life. Every reconditioned unit undergoes a calibration bench test to verify the fuel curve against Jiangdong's original performance map.

Beyond the Jiangdong 2110, this pump directly serves the TY2110 and 2105 derivatives commonly installed in Jinma tractors, Foton harvesters, and stationary gensets up to 50 kVA. Operators in Southeast Asia, Africa, and South America frequently encounter these engines in rice paddies and construction sites. The BH2Q85R8 head is specifically valved for the 2110's swirl‑chamber design; substituting with a generic head alters atomisation, leading to incomplete burn and carbon packing around piston rings. For repair shops maintaining mixed fleets, this pump covers a broad swath of Chinese‑built machinery, reducing the need to stock multiple variants. The 38 kW rating corresponds to a peak fuel delivery of approximately 78 mm³ per stroke, ensuring the engine meets its rated drawbar pull without over‑fuelling at high altitudes.

Mounting this pump demands meticulous attention to the drive gear backlash-set between 0.08 mm and 0.12 mm-to avoid noisy operation or gear tooth spalling. The fuel inlet banjo bolt requires a new copper crush washer each removal; reusing old washers invites air suction, which causes erratic governor response. Before bolting the unit, rotate the engine to cylinder No.1 compression TDC and align the pump's timing mark with the housing pointer. A dial indicator inserted through the delivery valve port confirms the exact start‑of‑delivery point; visual alignment alone is inadequate. Post‑installation, bleed the high‑pressure lines at the injector nuts while cranking-trapped air prolongs starter motor engagement and may wash cylinder walls. We recommend replacing the fuel filter element simultaneously to prevent any residual contamination from scoring the new plunger. Record the shim stack thickness behind the governor spring; this determines the high‑speed cut‑off point and must be restored to factory specs during reassembly.

While modern common‑rail systems offer variable injection timing, the KANGDA mechanical pump remains economically advantageous for the Jiangdong 2110 due to its simplicity and field‑repairable nature. Common‑rail retrofit costs exceed the value of most used tractors, whereas a reconditioned BH2Q85R8 unit restores engine performance at a fraction of that expense. Moreover, mechanical pumps are immune to ECU failures, electromagnetic interference, or sensor drift-issues that plague electronic systems in humid, dusty farm environments. For workshops, rebuilding this pump is a profitable service: plunger and barrel sets cost approximately one‑third of a new assembly, and bench calibration requires only standard test equipment. The delivery valve and governor weight are readily available as service kits, enabling in‑house rebuilds within two hours. Investing in a calibration bench pays for itself after ten overhauls, given the high turnover of these pumps in agricultural regions. Ultimately, this pump offers the best total‑cost‑of‑ownership for operators who value uptime and parts accessibility over novel electronic features.

Q1: How to tell if the BH2Q85R8 head is worn beyond reconditioning?
A: Mic the plunger clearance-if it exceeds 0.015 mm, internal leakage degrades hot starting. Also check the delivery valve seat for pitting; lapping often fails if erosion exceeds 0.2 mm depth, requiring complete head replacement.

Q2: Will this pump work on a 2110 engine with a different governor?
A: Only if the governor assembly matches the original RSV or RSF type. The housing accepts both, but spring rates differ. Installing the wrong governor alters droop characteristics, making throttle response unpredictable under load.

Q3: What is the lead time for a fully bench‑tested unit?
A: Stocked units ship within 24 hours. Custom‑calibrated pumps for non‑standard altitudes or special applications require 3‑5 business days for testing and documentation.

Q4: Can we return a pump if it doesn't solve the engine problem?
A: Returns accepted within 30 days for unused, uninstalled units. Installed pumps are non‑refundable unless a bench test proves factory calibration deviation-we cover return freight in that case.

Q5: Are service kits (plunger, barrel, delivery valve) available separately?
A: Yes, we stock full overhaul kits under part number KDS‑2110‑KIT. Each kit includes gaskets, shims, and O‑rings. Order separately for cost‑effective in‑house rebuilding.