Sierra 18-70935 Molded Hose - Thermostat Housing to Starboard Exhaust Manifold, Replaces 32-806856

The Sierra 18-70935 is a molded rubber hose engineered to connect the thermostat housing to the starboard manifold on engines equipped with a 2 piece exhaust manifold. It is built as a direct replacement for OEM number 32-806856 and is designed to meet or exceed the performance of the original equipment part it replaces. The hose is molded in white and constructed from a durable plastic-composite material intended to withstand the heat, vibration, and harsh marine environment found in an engine compartment.

Each package includes one molded hose. It is intended for MerCruiser stern drive applications across a wide range of engine families, including 200 2bbl, 230 4bbl, 260, 350 Mag, 4.3L, 5.0L, and 5.7L configurations in various carbureted, EFI, TBI, and MPI variants, as well as SKI and Black Scorpion applications. Because this hose is designated for the starboard side thermostat housing to manifold connection, buyers should confirm this fitment against their engine's exhaust manifold configuration before ordering; a separate hose (Sierra 18-70938) is used for the oil cooler to thermostat housing connection and is not interchangeable with this part.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-70935
• Application: Thermostat housing to starboard manifold with 2 piece exhaust manifold
• Type: Molded Hose
• Material: Plastic
• Color: White
• Weight: 0.9 pounds
• UPC: 808282203351
• Unit Count: 1 hose per package
• OEM Cross-Reference: 32-806856

Fitment

• 200 2bbl (1987)
• 230 4bbl (1987)
• 260 (1987)
• 350 Mag SKI (1991-96)
• 350 Mag Alpha (1987-95)
• 350 Mag Alpha 4bbl (1996)
• 350 Mag Alpha EFI (Gen+) (1996)
• 350 Mag Bravo MPI (1995)
• 350 Mag Bravo MPI (Gen+) (1996)
• 350 Mag EFI SKI TBI (1994-96)
• 350 Mag MPI SKI (1995-96)
• 4.3L (Gen II) (2bbl) (1993-96)
• 4.3LX (Gen II) (4bbl) (1993-96)
• 5.0L 2bbl (1988-95)
• 5.0LX 4bbl (1988-95)
• 5.7L (1988-95)
• 5.7L 2bbl (1996)
• 5.7L Alpha EFI TBI (1995)
• 5.7L Bravo EFI TBI (1995)
• 5.7L Competition SKI (1996)
• 5.7L EFI (2bbl TBI) (1996)
• 5.7L MIE (1996)
• 5.7LX 4bbl (1996)
• 5.7LX Bravo EFI (Gen+) (1996)
• 5.7LX EFI 4bbl TBI (1996)
• Black Scorpion (Gen+) (1996)

Replaces (OEM)

• 32-806856

Frequently Asked Questions

What is the Sierra 18-70935 molded hose used for? It connects the thermostat housing to the starboard manifold on engines equipped with a 2 piece exhaust manifold, a role specific to the Sierra 18-70935.

Does the 18-70935 replace OEM part 32-806856? Yes, Sierra 18-70935 is a direct replacement for OEM number 32-806856 and is built to meet or exceed the original part's performance.

What is this hose made of? The 18-70935 is a molded hose made from a plastic-composite material designed to hold up in the marine engine compartment environment.

What color is the Sierra 18-70935 hose? This hose is molded in white.

How much does the 18-70935 hose weigh? The Sierra 18-70935 molded hose weighs 0.9 pounds.

How many hoses are included in the package? One molded hose is included per package of the 18-70935.

Will the 18-70935 fit a 5.7L MerCruiser stern drive? Yes, the 18-70935 fits multiple 5.7L configurations including 5.7L (1988-95), 5.7L 2bbl (1996), 5.7L Alpha EFI TBI (1995), 5.7L Bravo EFI TBI (1995), 5.7L Competition SKI (1996), and several other 5.7L and 5.7LX variants.

Is the 18-70935 the same hose as the 18-70938? No. The 18-70935 is used for the thermostat housing to starboard manifold connection, while the 18-70938 is a separate part used for the oil cooler to thermostat housing connection; the two are not interchangeable.

Does this hose fit 4.3L engines? Yes, the 18-70935 covers 4.3L (Gen II) (2bbl) (1993-96) and 4.3LX (Gen II) (4bbl) (1993-96) applications.

Is the Sierra 18-70935 an OEM or aftermarket part? It is an aftermarket Sierra part engineered to meet or exceed the OEM part it replaces, 32-806856.

Does the 18-70935 fit 350 Mag configurations? Yes, coverage includes 350 Mag SKI (1991-96), 350 Mag Alpha (1987-95), 350 Mag Alpha 4bbl (1996), 350 Mag Alpha EFI (Gen+) (1996), 350 Mag Bravo MPI (1995 and Gen+ 1996), 350 Mag EFI SKI TBI (1994-96), and 350 Mag MPI SKI (1995-96).

Is this hose for a specific side of the engine? Yes, the 18-70935 is specifically designed for the starboard side thermostat housing to manifold connection on engines with a 2 piece exhaust manifold.