Sierra Sleeve Installation Tool, Mercury Marine 91-817570T Cross Reference, Part Number 18-9870

The Sierra Sleeve Installation Tool, part number 18-9870, is a specialty marine tool built for driving and seating a sleeve into place with precise, even pressure. Machined from aluminum and finished in white, the tool is designed to hold up to repeated workshop use while keeping weight manageable at the bench or in a service kit. It corresponds to Mercury Marine part number 91-817570T, making it the correct tool to reach for when a job calls for that specific Mercury Marine sleeve installation procedure. As a dedicated installation tool rather than a general-purpose driver, it is built to properly seat the sleeve without damaging it, helping technicians and boat owners complete the install correctly the first time. The tool ships as a single piece and is intended for use as part of a proper sleeve installation procedure alongside the sleeve itself. Its aluminum construction keeps it lightweight for handling while remaining rigid enough to transmit installation force accurately. For anyone maintaining Mercury Marine equipment that calls for this sleeve service, having the correctly matched Sierra tool on hand removes the guesswork of using an improvised or incorrect driver.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-9870
• Product Type: Sleeve Installation Tool
• Material: Aluminum
• Color: White
• Weight: 7.08 pounds
• UPC: 808282109783
• OEM Cross Reference: Mercury Marine 91-817570T

Replaces (OEM)

• Mercury Marine 91-817570T

Frequently Asked Questions

What is the Sierra 18-9870 tool used for? Sierra part number 18-9870 is a sleeve installation tool used to drive and seat a sleeve into place with even, controlled pressure.

What Mercury Marine part does the Sierra 18-9870 cross-reference to? The Sierra 18-9870 sleeve installation tool corresponds to Mercury Marine part number 91-817570T.

What is the Sierra 18-9870 tool made of? It is made of aluminum, giving the 18-9870 sleeve installation tool a lightweight but rigid build for accurate driving force.

What color is the Sierra 18-9870 sleeve installation tool? The tool has a white finish.

How much does the Sierra 18-9870 tool weigh? The Sierra 18-9870 sleeve installation tool weighs 7.08 pounds.

Is the Sierra 18-9870 a genuine Sierra part? Yes, 18-9870 is the Sierra manufacturer part number for this sleeve installation tool, cross-referenced to Mercury Marine 91-817570T.

Does the Sierra 18-9870 come with the sleeve included? No, the 18-9870 listing includes the sleeve installation tool itself; it does not include the sleeve component.

Can the Sierra 18-9870 be used on parts other than the Mercury Marine 91-817570T application? The Sierra 18-9870 sleeve installation tool is cross-referenced specifically to Mercury Marine 91-817570T, so it should be used for that application.

How do I identify the correct tool for my sleeve installation job? Match your Mercury Marine OEM part number to 91-817570T to confirm the Sierra 18-9870 is the correct sleeve installation tool for the job.

Is the Sierra 18-9870 sold as a single piece? Yes, the Sierra 18-9870 sleeve installation tool is a single-piece tool.