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OEM-spec exhaust manifold pipe assembly for SINOTRUK HOWO trucks. Part number WG9725542041. Durable replacement component in engine exhaust system repair and fleet maintenance.
SINOTRUK OEM-Compatible Exhaust Pipe Assembly – Model WG9725542041 | For HOWO WD615 & MC Series Engines
Maximize engine performance and reduce backpressure with this genuine-specification exhaust pipe assembly (Part No. WG9725542041) , engineered specifically for SINOTRUK HOWO heavy-duty trucks. Designed as a direct-fit replacement for original equipment, this durable exhaust component ensures smooth gas flow from the turbocharger to the downpipe or muffler system — making it an essential engine spare part in routine maintenance, emissions control, and fleet repair operations worldwide.
Constructed from high-strength stainless steel (AISI 409 or equivalent) , this exhaust pipe resists corrosion, thermal fatigue, and mechanical stress caused by constant expansion and contraction. It is compatible with common HOWO models including A7, A5, T7H, T5G, and special-purpose vehicles such as cement mixers, dump trucks, and long-haul freighters.
The WG9725542041 fits seamlessly into the existing exhaust layout, maintaining factory alignment and clearance. Its precision-welded flanges and pre-installed hanger brackets allow for quick, tool-friendly installation without modifications.
This part is widely used in Sinotruk spare parts supply chains, especially in regions with harsh operating conditions like Africa, Southeast Asia, the Middle East, and South America — where durability and availability are critical.
Technical Specifications:
OEM Part Number: WG9725542041
Function: Turbo Outlet to Downpipe Exhaust Manifold Pipe
Material: Stainless Steel (AISI 409 / SUS409L)
Wall Thickness: 1.8 mm – 2.0 mm
Diameter: Ø76 mm (3 inches) inlet, tapers to Ø60 mm (optional)
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How to Install the WG9725542041 Exhaust Pipe on SINOTRUK HOWO Trucks:
Cool Down Engine: Never work on a hot exhaust system. Allow engine to cool completely before starting.
Lift Vehicle if Needed: Use jack stands to safely access undercarriage components (for rear/mid-pipe variants).
Remove Heat Shield: Unbolt metal heat shielding around the exhaust section using 10–13mm sockets.
Loosen Flange Bolts: Apply penetrating oil to rusted flange bolts between the turbo outlet and exhaust pipe. Loosen gradually to avoid breakage.
Disconnect Downpipe or Flex Joint: If equipped with flexible coupling, unbolt it carefully. Support the pipe as it may be heavy.
Remove Old Exhaust Pipe (WG9725542041): Slide out the old assembly from hangers and mounting points.
Inspect Hangers & Gaskets: Replace worn rubber hangers and old gaskets to prevent vibration noise and leaks.
Install New Exhaust Pipe (WG9725542041): Align new pipe with turbo outlet and downpipe. Insert new high-temp exhaust gasket.
Tighten Flange Bolts Evenly: Torque to ~35–45 Nm in crisscross pattern. Do not over-tighten cast flanges.
Reattach Heat Shield & Test: Reinstall all shields and start engine. Listen for hissing (leaks) and check for smoke at joints.
