3858958 Volvo Intake Manifold | Genuine Used Part

🔧 Product Description

Genuine Volvo Penta 5.0L / 5.7L EFI Upper Inlet Pipe - Part Number: 3858958

A genuine Volvo Penta upper inlet pipe used as the top section of the two-piece intake-manifold assembly on selected GM-based 5.0L and 5.7L EFI petrol marine engines. The OEM catalogue calls this component Inlet Pipe rather than the complete lower intake manifold.

⚙️ Key Features

• Genuine Volvo Penta OEM upper intake component
• Correct part number 3858958
• Used on selected 5.0L and 5.7L EFI engines
• Mounts above lower inlet manifold 3858959
• Supports throttle body and intake-air distribution

🚤 Compatibility

• Volvo Penta 5.0GXi and 5.0OSi model families
• Volvo Penta 5.7Gi, 5.7GXi, 5.7OSi and 5.7OSXi model families
• Documented on B-, C-, G-, H- and related suffix packages where 3858958 is listed
• Engine Type: GM-based V8 multipoint or throttle-body fuel-injected marine petrol engine
• Fitment controlled by Volvo Penta engine suffix and intake assembly

🔌 Function

The upper inlet pipe receives air from the throttle body and distributes it into the lower intake-manifold runners while supporting idle-air and engine-management passages.

⚠️ Common Signs of Failure

• Cracked or warped upper housing
• Vacuum leak at the lower-manifold joint
• Damaged throttle-body or IAC mounting surface
• Loose or stripped threaded inserts
• Unstable idle or lean fault
• Reduced airflow and engine power

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3858958 is the documented Volvo Penta inlet-pipe reference
• No direct superseding Volvo Penta number has been verified
• 3858959 is the companion lower intake manifold, not a supersession

OEM / Related Numbers

• 3858958 upper inlet pipe
• 3858959 lower inlet manifold
• 3858960 related intake gasket
• 3858966 related intake component / cover reference
• Related throttle body, IAC valve, MAP sensor and fuel-rail components
• Related Volvo Penta EFI engine harness connections

Aftermarket / Verified Equivalents

• No verified direct aftermarket upper inlet pipe with a separate cross-reference
• Used genuine 3858958 components are the direct replacement
• Aftermarket throttle bodies, IAC valves, sensors and gaskets are available separately
• Complete used intake assemblies are sometimes sold with 3858958, 3858959 and 3858966 together

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated