KANGDA 2QT36P / BH2QT90R9 Diesel Injection Pump – YC2115 Engine

This KANGDA fuel injection pump assembly, identified by order number 2QT36P and pump model BH2QT90R9, is a direct-fit replacement engineered specifically for the Yuchai YC2115 industrial diesel engine. Designed for workshops handling agricultural tractors, compact construction loaders, and off-grid generator sets, this unit restores factory-spec fuel delivery without requiring software calibration or ECU interfacing. It operates as a mechanically governed inline pump, offering straightforward diagnostics and field-serviceable components that appeal to fleet maintenance shops prioritising uptime.

The BH2QT90R9 pump synchronises with the YC2115's power band at a governed speed of 2400 RPM, where the engine produces 37.1 kW of continuous output. Critical internal clearances-including plunger-to-barrel fit and delivery valve seating-are held to tolerances that support stable idle characteristics and smoke-free acceleration under variable loads. This assembly ships with the correct drive gear orientation for the Yuchai timing case, eliminating the need for aftermarket spacer plates or modified mounting brackets. Workshop data indicates that replacing a worn unit with this KANGDA model restores rail pressure consistency within 2% of OEM new-build specifications, directly impacting fuel economy and cold-start reliability.

Beyond the YC2115 block, this injection pump sees heavy use in rice transplanters, small-wheel loaders, and three-phase generator heads rated between 30–40 kVA. The pump's mechanical governor reacts to load changes without electronic lag, a trait valued in regions where ambient temperatures fluctuate between -5°C and 45°C. Many aftermarket diesel specialists stock the 2QT36P as a standardised alternative to dealer-only parts, given its identical mounting footprint and fuel line port orientation. For workshops servicing mixed fleets, this single SKU covers multiple chassis variants that share the Yuchai powerplant, reducing inventory complexity while maintaining service level agreements with agricultural cooperatives.

Before bolting the replacement pump, technicians should confirm that the drive shaft keyway matches the existing coupling and that the high-pressure line nuts are not cross-threaded. A dial gauge check of plunger lift at No. 1 cylinder's compression stroke verifies timing within the 8–10° BTDC window recommended for this engine family. Always install new copper washers under the delivery valve holders and torque the mounting flange bolts to 45–50 N·m in a diagonal sequence. After priming the low-pressure circuit, crank the engine without allowing it to start for 15 seconds-this purges trapped air from the injection lines and prevents dry-scoring of the plunger surfaces during initial rotation.

Investing in the BH2QT90R9 as a preventative replacement avoids collateral damage from a failing pump, such as nozzle coking, cylinder wash-down, or diluted lube oil. Compared to common-rail alternatives that demand specialised test benches and proprietary diagnostic tablets, this mechanical pump can be pop-tested and calibrated with standard Bosch-style equipment found in most independent diesel shops. Fleet operators report an average payback period of under 400 operating hours when replacing an ageing pump with this KANGDA unit, factoring in reduced cranking time, lower visible smoke, and consistent power delivery during PTO-driven operations. The cast-iron housing also withstands minor external impacts better than aluminium-bodied competitors, making it a practical choice for engine bays exposed to debris and vibration.

Q1: Will this pump directly replace a unit with a different Bosch-style number on my YC2115?
A: Yes, provided the flange bolt pattern and the gear teeth count match your existing setup. Compare your old pump's drive shaft diameter-the BH2QT90R9 uses the standard 22mm spline common to this Yuchai series.

Q2: What fuel lubricity level does KANGDA recommend for maximum plunger life?
A: Maintain a minimum wear scar diameter (WS 1.4) of 460 microns per ISO 12156. Using ULSD with added lubricity improver is strongly advised in regions with <500 ppm sulphur content.

Q3: Can I rebuild this unit myself, or is it a core-exchange item?
A: Most wholesale suppliers accept the 2QT36P as a core for remanufacturing. In-house rebuilds are possible if you have access to a certified pump test stand and calibrated delivery valve testers.

Q4: How does this mechanical pump handle load surges from hydraulic systems?
A: The integrated variable-speed governor compensates within 50 milliseconds, maintaining RPM within ±25 revs under sudden load applications-adequate for most loader and backhoe operations.

Q5: What shipping documentation confirms OEM compatibility for customs clearance?
A: Each unit includes a test report showing flow rates at 200, 600, and 1200 pump strokes per minute, alongside the YC2115-specific timing curve, which satisfies most import compliance reviews.