Sierra 18-1975-1 Manifold Riser with Exhaust Tube, Replaces Mercury Marine 12076A2, Fits MCM 2.5L & 3.0L/LX

The Sierra 18-1975-1 is a manifold riser with integrated exhaust tube, built as a direct replacement for the Mercury Marine exhaust riser used on late model Mercruiser 4 cylinder engines, specifically the MCM 2.5L and 3.0L/LX (1982 and newer). The riser directs exhaust gases and cooling water away from the manifold and out through the exhaust elbow, and is engineered to the same fit and function as the original Mercury Marine 12076A2 riser it replaces.

This riser is designed for use with Sierra manifolds 18-1954-1, 18-1955-1, and 18-1956-3. A complete installation calls for the matching elbow gasket (18-2819-1), the 18-8551 mounting hardware kit (which includes only the hardware for this elbow), and the 18-2748 exhaust boot to complete a sealed exhaust path. The riser is finished in white and weighs 18.35 pounds as shipped.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1975-1
• Product Type: Manifold Riser with Exhaust Tube
• OEM Cross Reference: 12076A2
• Color: White
• Weight: 18.35 pounds
• Used With Manifolds: 18-1954-1, 18-1955-1, 18-1956-3
• Elbow Gasket: 18-2819-1
• Mounting Hardware: 18-8551
• Exhaust Boot: 18-2748
• UPC: 808282186470

Fitment

• Mercury Marine / Mercruiser late model 4 cylinder engines
• MCM 2.5L and 3.0L/LX, 1982 and newer

Replaces (OEM)

• Mercury Marine 12076A2

Frequently Asked Questions

What does the Sierra 18-1975-1 replace? The Sierra 18-1975-1 manifold riser is a direct replacement for Mercury Marine OEM part 12076A2.

Which engines is this riser designed for? This riser fits late model Mercruiser 4 cylinder engines, specifically the MCM 2.5L and 3.0L/LX, 1982 and newer.

How much does the 18-1975-1 riser weigh? The Sierra 18-1975-1 manifold riser weighs 18.35 pounds.

What color is the 18-1975-1 manifold riser? It ships finished in white.

Which manifolds does the 18-1975-1 work with? This riser is designed for use with Sierra manifolds 18-1954-1, 18-1955-1, and 18-1956-3.

What gasket do I need with the 18-1975-1 riser? Use elbow gasket 18-2819-1 with the Sierra 18-1975-1 manifold riser.

Does the 18-1975-1 come with mounting hardware? No, mounting hardware is sold separately as hardware kit 18-8551, which includes only the hardware needed for the 18-1975-1 elbow.

Is an exhaust boot required with this riser? Yes, the 18-2748 exhaust boot is used to complete the sealed exhaust path with the 18-1975-1 riser.

Is the Sierra 18-1975-1 genuine Sierra or aftermarket? It is a genuine Sierra part, manufactured as an aftermarket replacement equivalent to Mercury Marine 12076A2.

What is included with the 18-1975-1 riser? The listing includes one Sierra 18-1975-1 riser with exhaust tube; the elbow gasket, mounting hardware, and exhaust boot are separate part numbers.

Will the 18-1975-1 fit older Mercruiser engines before 1982? Fitment for the Sierra 18-1975-1 is confirmed for MCM 2.5L and 3.0L/LX engines from 1982 and newer; earlier engines are not confirmed.

What warranty applies to the Sierra 18-1975-1? The 18-1975-1 is covered under Sierra's standard customer satisfaction warranty, as with all Sierra parts.