Sierra 18-6751 Manual Release Valve, Replaces Mercury 813442A2/812843A1, Fits Outboards with Integral Tilt and Trim

The Sierra 18-6751 is a manual release valve engineered for outboard motors equipped with integral tilt and trim systems. This valve allows the operator to manually release hydraulic pressure in the tilt and trim system, enabling the outboard to be raised or lowered by hand in the event of a power trim failure or when manual adjustment is needed, such as during towing or storage. Built with a glass-filled body and a machined exterior finish, the valve is designed to hold up to the demands of the marine environment while providing a reliable seal against hydraulic fluid.

This valve is a direct-fit replacement for a wide range of Mercury and Mariner outboard motors that use an integral tilt and trim unit, and it cross-references to several original Mercury/Mariner part numbers, making it easy to source the correct replacement without needing to identify a supplier-specific code. It is intended for outboard owners and marine technicians performing tilt and trim system repairs or routine maintenance.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6751
• Product Name: Manual Release Valve
• Material: Glass
• Valve Type: Manual
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.02 pounds
• Exterior Finish: Machined
• Number of Ports: 2
• Packaging: Package of 10, priced per package
• Fitment: Most 2 and 4 stroke outboards with integral tilt and trim

Fitment

• Most 2 and 4 stroke outboard motors with integral tilt and trim

Replaces (OEM)

• 893929A01
• 813442A2
• 813442A1
• 811618A1
• 811618
• 812843A1
• 99660A1

Frequently Asked Questions

What does the Sierra 18-6751 manual release valve do? It allows the operator to manually release hydraulic pressure in an outboard's integral tilt and trim system, so the motor can be raised or lowered by hand if the power trim is not working or when manual adjustment is needed.

Which outboard motors does the 18-6751 valve fit? The Sierra 18-6751 fits most 2 and 4 stroke outboard motors that use an integral tilt and trim system.

What OEM part numbers does the Sierra 18-6751 replace? It replaces Mercury/Mariner part numbers 893929A01, 813442A2, 813442A1, 811618A1, 811618, 812843A1, and 99660A1.

Is the 18-6751 an original Mercury part or an aftermarket replacement? The 18-6751 is a Sierra-manufactured replacement valve built to match the fit and function of the Mercury/Mariner OEM parts it cross-references, rather than an original Mercury-branded part.

What material is the manual release valve made from? The Sierra 18-6751 manual release valve is made from a glass-filled material with a machined exterior finish.

How much does the 18-6751 weigh? The Sierra 18-6751 manual release valve weighs 0.02 pounds.

What are the dimensions of the 18-6751 valve? The valve measures 0.39 x 0.39 x 0.39 inches.

How many ports does the 18-6751 valve have? The Sierra 18-6751 has 2 ports.

How is the Sierra 18-6751 packaged? The 18-6751 is sold as a package of 10 and priced per package.

Can this valve be installed as a DIY repair? The Sierra 18-6751 is a direct-fit replacement valve for outboards with integral tilt and trim, making it suited for owners or technicians performing their own tilt and trim maintenance.

Does Sierra offer a warranty on the 18-6751? Sierra warrants the 18-6751 and its other parts to be free of defects in workmanship and materials for the useful life of the product, subject to Sierra's standard warranty terms.