Oil Pipe For ISUZU NHR NKR55 77 G5 Truck 4JB1/TC Engine Repair 8944436449 8-94443644-9

Oil feed line (OE 8-94443644-9 / 8944436449) designed for alternator rear-mounted vacuum pumps on Isuzu 4JB1 and 4JB1-TC light commercial diesel engines.

In our Chongqing workshop inspections on older NKR55 fleets, drivers often describe a sudden hard brake pedal when descending hills. Over 70% of the time, this comes down to an oil-starved vacuum pump. Because the feed pipe (8-94443644-9) carries continuous 3.5–4.0 bar pressure next to exhaust heat, the inner rubber lining eventually cooks and swells inward, throttling oil flow to the spinning pump vanes.

When installing a replacement line, always blow compressed air through the block-side banjo bolt to verify its 1.5mm restrictor orifice is clear. Fit brand-new copper crush washers on both sides of each union, thread the bolts smoothly by hand, and torque to 22–24 Nm. Check that the hose maintains a natural 15mm clearance from the alternator drive belt and oil dipstick guide.

• Accurate Factory Angles: Pre-shaped banjo ends drop directly onto 4JB1 cylinder block ports without causing torsional stress on the flexible section.
• Heat & Oil Resistant Rubber: Multi-layer synthetic rubber core resists softening and cracking under 125°C continuous diesel oil temperatures.
• Rotary-Crimped Steel Collars: Heavy-gauge hydraulic sleeves prevent fitting separation under cold-morning oil pressure peaks.
• Export Master Packing: Every pipe is port-capped and sealed in moisture-proof poly bags to prevent corrosion during sea freight.

Source matched mechanical sub-assemblies for consolidated fleet maintenance orders:

Supplying genuine and certified aftermarket replacement brands:

Providing full-range Isuzu commercial vehicle spare parts from Chongqing since 1997. Send your part numbers, truck nameplates, or mixed-parts list to our team for quick stock verification and shipping options.

Facility Address: Baishiyi Automotive Industrial Zone, High-tech District, Chongqing, China

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