Sierra 18-2746 Lower Exhaust Boot, 4 Inch Tube, Fits Mercruiser MCM GM V-6 & V-8 Engines, Replaces Mercury Marine 32-14358T

The Sierra 18-2746 is a lower exhaust boot built for Mercruiser MCM stern drive installations powered by GM V-6 and V-8 engines. It connects the exhaust manifold or riser to the exhaust tube, sealing the joint against exhaust gas and water intrusion while absorbing the vibration and slight misalignment that occurs between rigid engine components and the drive system. The lower tube measures 4 inches (101.6mm), matching the factory exhaust tube diameter on applicable Mercruiser installations.

Sierra manufactures this exhaust boot to meet or exceed the performance of the original equipment part it replaces, and it is built to hold up to the heat, saltwater, and constant vibration of marine exhaust service. Sierra supplies parts to OEM engine manufacturers and boat builders, so the 18-2746 is engineered to the same fit and function standard as the factory boot it is designed to replace.

This exhaust boot is a direct fit for Mercruiser MCM GM V-6 and V-8 powered stern drive engines. Always confirm the 4 inch lower tube diameter matches your existing exhaust boot before ordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2746
• Product Type: Lower Exhaust Boot
• Fits: Mercruiser MCM GM V-6 & V-8 engines
• Lower Tube Diameter: 4 inches (101.6mm)
• Weight: 0.77 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 030999752949
• OEM Cross Reference: Mercury Marine 32-14358T

Fitment

• Mercruiser MCM GM V-6 & V-8 engines

Replaces (OEM)

• Mercury Marine 32-14358T

Frequently Asked Questions

What does the Sierra 18-2746 exhaust boot fit? The Sierra 18-2746 is designed for Mercruiser MCM stern drive installations powered by GM V-6 and V-8 engines.

What size is the lower tube on this exhaust boot? The lower tube on the Sierra 18-2746 measures 4 inches, or 101.6mm, in diameter.

Is the Sierra 18-2746 a direct replacement for the Mercury Marine 32-14358T? Yes, the Sierra 18-2746 is built to replace Mercury Marine part number 32-14358T and is engineered to meet or exceed the fit and function of the original part.

How much does the Sierra 18-2746 exhaust boot weigh? It weighs 0.77 pounds.

Is the Sierra 18-2746 an OEM part or an aftermarket replacement? The Sierra 18-2746 is an aftermarket exhaust boot manufactured by Sierra to meet or exceed the performance of the original equipment Mercury Marine part it replaces.

Where does the 18-2746 exhaust boot install on a Mercruiser stern drive? It fits in the lower exhaust tube section, connecting the exhaust path on Mercruiser MCM GM V-6 and V-8 engine installations.

What is the UPC for the Sierra 18-2746? The UPC for the Sierra 18-2746 exhaust boot is 030999752949.

Does the Sierra 18-2746 work with both V-6 and V-8 Mercruiser engines? Yes, the Sierra 18-2746 is listed to fit Mercruiser MCM GM V-6 and V-8 engines.

What are the product dimensions of the 18-2746 exhaust boot? The Sierra 18-2746 measures 0.39 x 0.39 x 0.39 inches as packaged.

Why does the exhaust boot need to be replaced? Exhaust boots like the Sierra 18-2746 are exposed to constant heat, saltwater, and vibration, which over time can cause the original boot to crack, harden, or leak and require replacement.

Does Sierra make quality parts comparable to OEM Mercury Marine components? Sierra supplies parts to OEM engine manufacturers and boat builders, and the 18-2746 exhaust boot is built to meet or exceed the original equipment part it replaces.