KANGDA 2Q65 / BH2Q85R8 – Fuel Pump For 2108 Diesel

That truck sitting bayside with a fuel pressure code? It is burning shop time and customer patience. For the Rugao 2108 engine platform, the KANGDA 2Q65 (Order No.) / BH2Q85R8 (Pump Model) gives you a drop-in mechanical injection pump that gets the unit back on the road without re-engineering the fuel system. Rated for 2800 RPM direct drive, this assembly matches the factory flange and gear train so you are not chasing timing marks all afternoon.

The BH2Q85R8 carries the same plunger bore and stroke as the Rugao-spec original, meaning fuel delivery maps stay within the 2108 engine's thermal limits. Governed speed is locked to 2800 RPM direct drive-no belt slip, no intermediate shaft lash to interpret. The mechanical fuel rack responds to load changes via centrifugal weights, not an ECU dependent on crank and cam sensors. For a repair shop, this translates into straightforward diagnostics: if the engine stumbles, you check feed pressure, rack free play, and injector crack pressure. No flash programming, no crankshaft correlation relearn. The Order No. 2Q65 confirms the drive coupling matches the Rugao timing gear profile. Mounting flange bolt spacing is standard for that production line. High-pressure outlets are oriented to align with the original steel lines, so you are not bending replacement tubing and introducing stress fractures down the line.

This unit belongs under the bonnet of off-highway equipment, stationary gensets, and small construction machines powered by the Rugao 2108 series. It is not designed for modern common rail architectures. The injection pressure sits well below CP3 or CP4 levels because the combustion chamber geometry on these older engines does not require 1,600 bar to atomise fuel. For workshops serving agricultural fleets or demolition machinery, this pump is a known quantity. It replaces the original without altering injector lines or return hose routing. However, if a customer walks in with a Euro V on-highway truck, do not offer this pump-the governor curve and delivery valve characteristics are mismatched for that application.

The most common profit leak with this pump is not the part itself, but skipped pre-installation steps. Contaminated fuel lines introduce abrasive particles that score the plunger within hours of first start. Flush the supply and return lines before connecting the BH2Q85R8. Replace the fuel filter-costs fifteen dollars, saves a 4-hour redo. Time the pump to the engine's TDC mark using the alignment pin hole on the drive flange. Failing to verify gear backlash on the Rugao 2108 timing train produces a knocking noise that gets misdiagnosed as a bottom-end bearing issue. After bleeding the low-pressure circuit, check full-load rack travel with the engine off; a sticking rack due to shipping preservative triggers black smoke on acceleration. Clean it with diesel fuel, not brake cleaner, to avoid washing out the internal lubricating film. Tighten high-pressure unions to the specified torque-over-tightening distorts the ferrule and creates a weep that mimics pump failure.

Q1: How does the KANGDA pump hold up under poor fuel quality compared to an OEM unit?
A: The BH2Q85R8 uses a hardened barrel with a controlled plunger clearance that reduces the risk of seizure when running on fuel with higher water content. The OEM-grade metallurgy gives you a safety margin, but do not skip primary filtration-our warranty does not cover water damage.

Q2: Can we order this pump in bulk for a fleet of 2108-powered machines?
A: Yes. For volume orders, we offer tiered pricing and can stage shipments to match your maintenance schedule. Contact our commercial desk for lead times on quantities exceeding 10 units.

Q3: Has this pump been dyno-tested on the Rugao 2108 for sustained load?
A: Yes. The calibration curve was validated on a test bench with the 2108's specific injector nozzles. We have logged over 500 hours of continuous operation at 75% load without drift in the fuel delivery tolerance band.

Q4: What is the typical shelf life for a new mechanical pump before internal seals degrade?
A: Stored in a dry environment at 15–25°C, the elastomer seals remain serviceable for 24 months. Rotate your stock quarterly and inspect the shaft oil seal for hardening before installation.

Q5: Does this pump require the same drive gear from the old unit, or is a new gear included?
A: The pump comes with the drive flange, but you need to reuse or replace the external gear wheel separately. The gear interface matches the Rugao 2108 standard, no adapter or shim kit required.