Sierra 18-1931-1 Manifold, Replaces Volvo Penta 835804-6 and 856883-4

The Sierra 18-1931-1 is an exhaust manifold built for Volvo Penta stern drive and inboard applications, engineered to meet or exceed the quality of the original equipment part it replaces. The manifold carries a machined exterior finish and is manufactured to the fit and function of the OEM component it is designed to replace, making it a direct swap for boat owners dealing with a cracked, corroded, or leaking factory manifold.

Exhaust manifolds route hot exhaust gases away from the engine while the surrounding water jacket cools the exhaust before it exits the boat, so the integrity of this component is critical to both engine cooling and safe exhaust handling. The Sierra 18-1931-1 is designed as a like-for-like replacement, and Sierra also offers matching mounting hardware kits engineered specifically for use with this manifold, simplifying installation for anyone replacing a worn unit.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1931-1
• Product Type: Exhaust Manifold
• Category: Volvo Penta Exhaust Manifolds
• Weight: 47 pounds
• Product Dimensions: 25.9 x 10.4 x 9.6 inches
• Exterior Finish: Machined
• UPC: 808282237431
• Compatible Mounting Kits: Sierra 18-8511, Sierra 18-8502

Fitment

• Designed for Volvo Penta exhaust manifold applications.
• Compatible with Sierra 18-8511 and Sierra 18-8502 mounting kits, both of which are designed for use with the 18-1931-1 manifold.

Replaces (OEM)

• GLM 51630
• Mallory 9-40901
• Osco 5805
• Volvo Penta 835804
• Volvo Penta 856883
• Volvo Penta 835804-6
• Volvo Penta 856883-4

Frequently Asked Questions

What does the Sierra 18-1931-1 replace? The Sierra 18-1931-1 manifold is interchangeable with GLM 51630, Mallory 9-40901, Osco 5805, Volvo Penta 835804, Volvo Penta 856883, Volvo Penta 835804-6, and Volvo Penta 856883-4.

Is this manifold a genuine Sierra part or a generic aftermarket copy? It is a genuine Sierra-branded manifold, part number 18-1931-1, built to meet or exceed the quality of the original equipment part it replaces.

What are the dimensions of the 18-1931-1 manifold? The Sierra 18-1931-1 measures 25.9 x 10.4 x 9.6 inches.

How much does the Sierra 18-1931-1 manifold weigh? This manifold weighs 47 pounds.

What finish does the manifold have? The Sierra 18-1931-1 has a machined exterior finish.

What application is the 18-1931-1 manifold designed for? It falls under Sierra's Volvo Penta exhaust manifold lineup, designed to replace factory Volvo Penta manifolds.

Do I need separate mounting hardware for the 18-1931-1? Yes, Sierra offers the 18-8511 and 18-8502 mounting kits, both specifically designed for use with the 18-1931-1 manifold.

Does the Sierra 18-8502 kit include hardware? Yes, the Sierra 18-8502 mounting kit, made for use with the 18-1931-1 manifold, includes mounting studs and hardware.

Can I cross-reference this part using a Volvo Penta OEM number? Yes, the 18-1931-1 replaces Volvo Penta 835804, 835804-6, 856883, and 856883-4.

Is the UPC available for the 18-1931-1 manifold? The UPC for the Sierra 18-1931-1 manifold is 808282237431.

Does this manifold include installation hardware in the box? The manifold itself does not include mounting hardware; the matching 18-8511 or 18-8502 kits are sold separately and provide the studs and hardware.

Will this manifold fit other brands besides Volvo Penta? The 18-1931-1 is categorized as a Volvo Penta exhaust manifold and cross-references to Volvo Penta, GLM, Mallory, and Osco part numbers.