SKU: 55193174848

Hinge Pin Tool – Fits Mercury/MerCruiser Sterndrive Alpha 1 Gen 1 & 2, Bravo I II III (Replaces 91-78310)

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Description

Hinge Pin Tool – Fits Mercury/MerCruiser Sterndrive Alpha 1 Gen 1 & 2, Bravo I II III (Replaces 91-78310)Hinge Pin Tool Fits Mercury MerCruiser Sterndrive Alpha 1 Gen 1 & 2, Bravo I II III This is a specialized service tool designed to remove and install hinge pins in Mercury MerCruiser sterndrive units. It is compatible with a wide range of drives, including Alpha One (Gen 1 and Gen 2) and all Bravo series (I, II, and III). This tool is a direct replacement for Mercury MerCruiser part 91 78310 and other aftermarket equivalents. Material: Constructed

Hinge Pin Tool – Fits Mercury/MerCruiser Sterndrive Alpha 1 Gen 1 & 2, Bravo I II III

This is a specialized service tool designed to remove and install hinge pins in Mercury MerCruiser sterndrive units. It is compatible with a wide range of drives, including Alpha One (Gen 1 and Gen 2) and all Bravo series (I, II, and III).

This tool is a direct replacement for Mercury/MerCruiser part 91-78310 and other aftermarket equivalents.

  • Material: Constructed from high-strength machined steel for durability.
  • Installation: Designed for manual use with a standard socket wrench.
  • Function: Used to remove and install hinge pins from the bell housing.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
Mercury/MerCruiser 91-78310 / 9178310
Sierra 18-9861
GLM 90200
Mallory 9-79805

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Brand Model Application Years OEM Part No. Notes
MerCruiser Alpha One Gen 1 Sterndrive All 91-78310 Used to remove/install hinge pins
MerCruiser Alpha One Gen 2 Sterndrive All 91-78310 Used to remove/install hinge pins
MerCruiser Bravo I Sterndrive All 91-78310 Used to remove/install hinge pins
MerCruiser Bravo II Sterndrive All 91-78310 Used to remove/install hinge pins
MerCruiser Bravo III Sterndrive All 91-78310 Used to remove/install hinge pins
MerCruiser Bravo X Sterndrive All 91-78310 Used to remove/install hinge pins
MerCruiser Bravo XR Sterndrive All 91-78310 Used to remove/install hinge pins
MerCruiser Bravo XZ Sterndrive All 91-78310 Used to remove/install hinge pins
MerCruiser MC-1 Sterndrive All 91-78310 Used to remove/install hinge pins
MerCruiser MR Sterndrive All 91-78310 Used to remove/install hinge pins

Technical Specifications

Specification Value
Product Type Service Tool (Hinge Pin Tool)
Installation Manual
Material Machined Steel
Color Silver
Thread Size Matches MerCruiser sterndrive hinge pin threading
Warranty 1 Year
Other Technical Attributes 12-point design for use with standard socket wrench

Package Contents

  • 1 x Hinge Pin Tool (Replaces 91-78310)

Installation Guide

  1. Secure the sterndrive in a stable position, trimming it to provide clear access to the hinge pins.
  2. Align the Hinge Pin Tool with the head of the hinge pin you intend to remove.
  3. Attach a standard socket wrench to the 12-point head of the tool.
  4. Apply firm, steady pressure counter-clockwise to loosen and unthread the hinge pin from the gimbal housing.
  5. Once the old pin is removed, clean the threads and prepare the new hinge pin for installation.
  6. Position the new hinge pin and use the tool to thread it into place, turning clockwise.
  7. Tighten the hinge pin to the manufacturer's specified torque to ensure a secure fit.

Troubleshooting & FAQ

Q: How do I confirm this tool will fit my sterndrive?
A: This tool is compatible with all Mercury MerCruiser Alpha One (Gen 1 and 2), Bravo (I, II, III, X, XR, XZ), MC-1, and MR sterndrive units. It is specifically designed as a direct replacement for OEM part number 91-78310 and related aftermarket parts.

Q: What makes this tool different from a standard socket?
A: This is a purpose-built tool machined to fit the unique shape of the sterndrive hinge pins perfectly. Using a standard socket or incorrect tool can strip the pin head, making removal extremely difficult.

Q: Do I need any other special tools for the job?
A: While this tool addresses the hinge pin itself, you will need a standard socket wrench to operate it. We also recommend having a torque wrench to ensure the new pin is tightened to the correct OEM specification.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

  • Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
  • This product is an aftermarket replacement part and is not an OEM component.
  • Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

  • Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
  • Fast Global Shipping: Free delivery worldwide in 5–15 days.
  • Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 55193174848

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4.4 ★★★★★
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Devan
Cuba, US
★★★★★ 5
Good material but bites back
Size: 20 sqft
Very good product for my rear trunk and backseat on my mustang. I would recommend some type of gloves due to the foil itself when placing down will cut up your hands and fingers. Overall good product for its price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 23, 2026
K
Verified Purchase
Kev
Belleville, US
★★★★★ 5
Makes For Quiet Rides
Model: 10 SqFt(0.95 SqM)
Comparable quality and performance to name brand competitor. It sticks on strong, easy to apply, and does make a difference in sound reduction. Turn your hollow shell sounding vehicle panels into solid sounding walls.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2026
T
Verified Purchase
Troy Amhaz
Waukegan, US
★★★★★ 5
Must for subwoofers. True 2mm spec. High quality.
Model: 36 SqFt(3.4 SqM), Model: 36 SqFt(3.4 SqM)
Let me start of by saying WOW! This made a huge difference in the SQ of my L7S pushing 930w rms. Before I had major rattles in my 2020 Honda Civic SI. Taking the time to do this to my trunk and Lid made me realize just how loud my subwoofer actually is. It literally eliminated the rattles throughout my whole car. I still plan on doing this to my doors and rear deck but once I upgrade the speakers. I still have half of the box just doing the trunk and lid so 1 box of 36sf will be enough for most of the areas that need to get done. You may need a little more overall. This is true 2mm spec. Very sticky and easy to apply. It just take time to finish the work correctly and roll it down. It is not as heavy as I thought it was going to be. The size of the sheets are perfect for what you need to do. The value is on point for the quality. It does not rip very easily but you can cut it to size without any problems. Again, This is a must buy for anyone who is pushing 1000w rms or more.
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Reviewed in the United States on November 29, 2025
C
Verified Purchase
Craigdog
Los Angeles, US
★★★★★ 5
Quality product you
Model: 18 SqFt(1.7 SqM), Model: 18 SqFt(1.7 SqM)
Summary: Great quality product, priced right. Cuts and installs easy-follow the instructions people!! PRO TIP-you don’t need to cover every square inch. OVERKILL!! Think about it-when a bell rings you could put your fingers on the edge and silence it right? Same rules apply here. A strip or square will isolate the vibration and notice when placed correctly— knock on the surface and see what vibrates or what part makes the loudest drowning and that’s a good clue of where you should put a piece of this…unless you’re trying to use it for temperature insulation no need to go ape on it. If you look at the bottom of a stainless steel sink, it’s got a stripe or a small sticker of insulation that keeps it from rattling. You can do that here. What’s important to note is the instruction specifically say use a roller to roll the ribs out until it’s smooth that way you’ve got maximum adhesion. I see a lot of pictures and videos from people that finished their install and didn’t follow this simple instruction. It makes sure that it’s stuck down before you put all your paneling and carpet back in and it’s a small step with a cheap wooden roller it’s easy. I’ll say the installation with this product is a breeze. You can use sharp scissors or a blade. It does get gummy after a while, and you may need to clean off your blade or your scissors, but it cuts very well and the ribs make it easy to size in space the thickness is fantastic and the backing paper comes off quite easily. I’ve done lots of installations with Graphics emblems you name it and this product is very easy to use and represents good value.
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Reviewed in the United States on March 30, 2026
S
Verified Purchase
Shopper
Houston, US
★★★★★ 5
Good stuff !
Model: 36 SqFt(3.4 SqM), Model: 36 SqFt(3.4 SqM)
This is an excellent product. Easily moldable, cuttable with good scissors or razor knife, very sticky, works great. This pack was enough to do all 4 doors on a crew max truck, and I went wild on the fronts. I used 9 peices on each rear door which was just enough, and the rest on the fronts. I doubled up layers and even used some on the back of the door panels. If you follow the instructions and dont go wild you might even have extra left over. It works just like you would imagine. Without doing the entire cab there will still be road noise but this helped noise, better audio, no buzzing door panels, terrific improvement. It is kind of heavy, so extra weight is added to truck, but that really isnt a bad thing. It is noticable but in a good way. Get it. Use it.
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Reviewed in the United States on March 20, 2026

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