Sierra 18-3160-1 Brass Sea Water Pump, OEM 723095, MerCruiser Bravo/Inboard V-6 & V-8 305/350/496 CID

The Sierra 18-3160-1 is a brass sea water pump built as a direct replacement for the raw water circulation pump on MerCruiser stern drive and inboard engines fitted with a brass pump body. This pump draws raw (lake, river, or sea) water through the engine's cooling circuit, keeping the block and exhaust manifolds within safe operating temperature. It is constructed of brass for corrosion resistance in raw water service, which also gives the housing its long service life compared to composite alternatives, and is finished in white.

This pump is designed to fit MerCruiser Bravo and inboard engines that use the brass sea water pump body, applicable from serial number 0M100001 and above, as well as 2000 and newer MerCruiser MCM V-6 and V-8 engines in 305, 350, and 496 CID displacements that are equipped with the brass sea water pump. It is a direct fit for engines originally equipped with OEM part number 723095. Because the water pump is a wear item exposed continuously to raw water and any grit or debris it carries, replacing it with a quality brass unit like the 18-3160-1 helps protect the engine from overheating caused by a worn or failing original pump. The unit ships as a complete pump assembly ready for installation in place of the original equipment pump.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3160-1
• Material: Brass
• Color: White
• Weight: 4.3 pounds
• UPC: 808282369668
• OEM Cross Reference: 723095
• Manufacturer Warranty: 90 days

Fitment

• MerCruiser Bravo and Inboard engines with brass sea water pump body, serial number 0M100001 and above
• MerCruiser MCM V-6 and V-8 (305, 350 and 496 CID) engines, 2000 and newer, equipped with the brass sea water pump

Replaces (OEM)

• 723095

Frequently Asked Questions

What engines does the Sierra 18-3160-1 sea water pump fit? The 18-3160-1 fits MerCruiser Bravo and inboard engines with the brass sea water pump body from serial number 0M100001 and above, and also fits 2000 and newer MerCruiser MCM V-6 and V-8 engines in 305, 350, and 496 CID displacements that use the brass sea water pump.

Is the Sierra 18-3160-1 a direct replacement for OEM part 723095? Yes, the 18-3160-1 is built as a direct equivalent to OEM part number 723095 and installs in place of that original MerCruiser pump.

What is the 18-3160-1 sea water pump made of? It is constructed of brass, which resists corrosion from continuous raw water exposure and holds up better over time than composite pump bodies.

How much does the Sierra 18-3160-1 weigh? The pump weighs 4.3 pounds.

Does the 18-3160-1 fit engines with a plastic pump body? No, the 18-3160-1 is specifically for the brass sea water pump body configuration; MerCruiser engines with a plastic pump body use a different Sierra part number.

What color is the 18-3160-1 sea water pump? This sea water pump has a white finish.

Will the 18-3160-1 fit any 305 or 350 CID MerCruiser? It fits 2000 and newer MerCruiser MCM V-6 and V-8 305, 350, and 496 CID engines specifically when those engines are equipped with the brass sea water pump, not the plastic-body version.

Is a gasket or seal kit included with the 18-3160-1? The 18-3160-1 is the complete brass sea water pump assembly; it is sold as the pump unit itself.

What is the warranty on the Sierra 18-3160-1 water pump? The 18-3160-1 carries a 90 day manufacturer warranty.

How do I know if my MerCruiser needs the brass or plastic sea water pump? Engines built with serial number 0M100001 and above using the brass pump body take the 18-3160-1; if your engine has the plastic pump body instead, a different Sierra part number is required, so checking the pump body material or the OEM part number (723095 for the brass version) confirms the correct fit.

What function does the 18-3160-1 sea water pump serve? It circulates raw water through the MerCruiser engine's cooling system, which keeps the block and exhaust manifolds at a safe operating temperature.