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Sinotruk HOWO Truck Parts Exhaust Pipe WG9925549130

The WG9925549130 is a genuine exhaust flexible pipe (commonly known as an exhaust bellows or metal flex hose) used in the exhaust systems of heavy-duty trucks manufactured by SINOTRUK (China National Heavy Duty Truck Group), particularly in the HOWO A7, T7H, N7, NX, and Sitrak C7H/G7 series.

Officially named the "Rear Section Exhaust Flexible Pipe", this component serves as a vibration-absorbing, thermally compensating connector between the engine’s turbocharger or exhaust manifold and the downstream exhaust system — including mufflers, SCR units, and diesel particulate filters.
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  • WG9925549130

  • Sinotruk HOWO

Attribute Description
Official Name Exhaust Flexible Pipe / Metal Hose Assembly
Common Names Exhaust Bellows, Flex Pipe, Exhaust Soft Connector
OEM Brand SINOTRUK (China National Heavy Duty Truck Group)
Part Number WG9925549130
Material Composition - Inner layer: Stainless steel corrugated tube (SUS304/SUS321)
- Middle layer: High-pressure resistant convoluted core
- Outer layer: Braided stainless steel wire mesh for strength and heat protection
Flange Material Carbon steel or stainless steel with anti-rust coating
Weight Approx. 3.5 kg – 4.5 kg
Surface Finish Natural metal / sandblasted; no paint (heat-resistant design)
Certification Complies with ISO 9001, TS16949, and China VI/Euro VI emission system requirements
Origin Jinan, Shandong Province, China
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Installation Instructions

✅ Pre-Installation Checks

  1. Verify correct part: Confirm WG9925549130 matches your engine and chassis configuration.

  2. Inspect new unit: Check for damaged braiding, dents in the bellows, or loose flanges.

  3. Identify flow direction: If marked with an arrow (→), align with exhaust gas flow (from engine to tailpipe).

  4. Prepare mounting area: Clean mating surfaces; replace old clamps and gaskets.

✅ Step-by-Step Installation

  1. Position the Flex Pipe:

    • Hold in place between turbo outlet and muffler inlet.

    • Ensure no twisting, stretching, or pre-loading — install in neutral position.

  2. Align Flanges:

    • Match bolt holes precisely.

    • Do not force misaligned pipes — adjust brackets instead.

  3. Install Seals & Clamps:

    • Place new VG1246110019 gasket on both sides.

    • Secure with WG9925540003 V-clamp or equivalent.

  4. Torque Fasteners:

    • Use calibrated wrench.

    • Torque to 25–30 N·m (refer to service manual).

    • Avoid over-tightening — can crush bellows or warp flanges.

  5. Final Inspection:

    • Visually check alignment.

    • Start engine and inspect for leaks (listen for hissing or whistling sounds).


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