Sierra Molded Hose 18-70938, Replaces 32-8066351, Thermostat Housing to Port Exhaust Manifold, Mercruiser 4.3L-5.7L

This Sierra molded hose, part number 18-70938, connects the thermostat housing to the port exhaust manifold on Mercruiser sterndrive engines. It is molded to a fixed shape rather than flexible tubing, so it seats correctly on the housing and manifold fittings without kinking or requiring extra clamps to hold its form. The hose is built from a plastic and rubber material and is finished in white.

This is the PORT side hose only. The equivalent hose for the starboard side thermostat housing to exhaust manifold connection is a separate part, 18-70939, which replaces a different OEM number -- be sure to order the correct side for your engine.

Fitment covers 262 Mag with VST (1996-97), 4.3L-LX (1993-96) Design III, 5.0L-LX (1988-95) Design III, 350Mag-EFI-MPI (1987-96), and 5.7L-LX (1988-96) Design III Mercruiser engines. Each package includes one molded hose. Sierra manufactures this hose to meet or exceed the specifications of the original equipment part it replaces, making it a direct aftermarket replacement rather than a universal-fit substitute.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-70938
• Product Type: Molded Hose
• Application: Thermostat housing to port exhaust manifold
• Material: Plastic, Rubber
• Color: White
• Included Components: Molded Hose (1 per package)
• Weight: 0.71 pounds
• UPC: 808282227678
• Replaces (OEM): 32-8066351

Fitment

• 262 Mag with VST (1996-97)
• 4.3L-LX (1993-96) Design III
• 5.0L-LX (1988-95) Design III
• 350Mag-EFI-MPI (1987-96)
• 5.7L-LX (1988-96) Design III

Replaces (OEM)

• 32-8066351

Frequently Asked Questions

Which side does the 18-70938 hose fit? The 18-70938 molded hose is for the port side only, connecting the thermostat housing to the port exhaust manifold. The starboard version is a separate part, 18-70939, which uses a different OEM cross-reference, so double check which side you need before ordering.

What OEM part number does this hose replace? Sierra 18-70938 replaces OEM number 32-8066351.

What engines is the 18-70938 hose designed for? It fits Mercruiser 262 Mag with VST (1996-97), 4.3L-LX (1993-96) Design III, 5.0L-LX (1988-95) Design III, 350Mag-EFI-MPI (1987-96), and 5.7L-LX (1988-96) Design III engines.

What is this hose made of? The 18-70938 hose is made of plastic and rubber and is finished in white.

How many hoses come in the package? One molded hose is included per package of the Sierra 18-70938.

How much does the 18-70938 hose weigh? It weighs 0.71 pounds.

Is this a genuine Sierra part or a generic aftermarket hose? This is a genuine Sierra manufactured part, number 18-70938, built to meet or exceed the specifications of the original equipment hose it replaces.

Where exactly does this hose connect? It runs from the thermostat housing to the port exhaust manifold on applicable Mercruiser engines.

Is the 18-70938 hose molded or a straight length of tubing I need to cut? It is a molded hose, pre-shaped to fit the thermostat housing to port exhaust manifold connection rather than a straight piece that needs to be bent or trimmed.

What is the UPC for this part? The UPC for Sierra 18-70938 is 808282227678.