Gimbal Housing Access Plug Kit – Fits MerCruiser Alpha One Gen II & Bravo (Replaces 22-88847A1)

$34.88 $55.00

Shipping calculated at checkout.

Gimbal Housing Access Plug Kit – Fits MerCruiser Alpha One Gen II & Bravo (Replaces 22-88847A1) is backordered and will ship as soon as it is back in stock.

Worry-free returns

You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Gimbal Housing Access Plug Kit – Fits MerCruiser Alpha One Gen II & Bravo (Replaces 22-88847A1) provides a straightforward method for accessing the gimbal ring to perform installation or removal without the need to remove the entire engine and transom assembly. Specifically designed for a range of MerCruiser sterndrives, it simplifies a complex maintenance task.

This kit serves as a direct replacement for Mercury Marine 22-88847A1, GLM 16005, and Sierra 18-2460, ensuring broad compatibility and OEM-level function.

Installs via surface mount, with included templates to ensure accurate placement of access holes.
Creates threaded 1-1/8" (28.5 mm) access ports sealed with 1 in. NPT pipe plugs.
Includes specific templates for various sterndrive models to guarantee correct fitment.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Mercury Marine	22-88847A1
GLM	16005
Sierra	18-2460

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For MerCruiser Sterndrives & Transom Assemblies: Please check your model and serial number range to ensure this kit is compatible with your unit. Different templates are included for different model groups.

Brand	Model	Years	OEM Part No.	Notes
MerCruiser	Alpha One (Gen. II)	1991–1995	22-88847A1	S/N: 0D469859 through 0F679999
MerCruiser	Alpha One (Gen. II)	1996–1997	22-88847A1	S/N: 0F680000 through 0K999999
MerCruiser	Alpha One (Gen. II)	1998 and Up	22-88847A1	S/N: 0L100040 & Up
MerCruiser	Blackhawk	1994–1995	22-88847A1
MerCruiser	Bravo		22-88847A1	S/N: 0M100001 through 0W249999
MerCruiser	Bravo One		22-88847A1	S/N: 0W250000 & Up
MerCruiser	Bravo Sterndrives		22-88847A1	S/N: 0F730000 through 0M100000
MerCruiser	Bravo Three		22-88847A1	S/N: 0M100001 through 0W249999; 0W250000 & Up; 0F730000 through 0M100000
MerCruiser	Bravo Two		22-88847A1	S/N: 0M100001 through 0W249999; 0W250000 & Up; 0F730000 through 0M100000
MerCruiser	Bravo X One		22-88847A1	S/N: 0M100001 through 0W249999; 0W250000 & Up
MerCruiser	Bravo X Three		22-88847A1	S/N: 0M100001 through 0W249999; 0W250000 & Up
MerCruiser	Bravo X Two		22-88847A1	S/N: 0M100001 through 0W249999; 0W250000 & Up
MerCruiser	Bravo XR One		22-88847A1	S/N: 0W240000 & Up; 0L914990 through 0W239999
MerCruiser	Bravo XR Sportmaster		22-88847A1	S/N: 0M906878 & Up; 0M052945 through 0M906877
MerCruiser	Bravo XR Three		22-88847A1	S/N: 0W240000 & Up
MerCruiser	Bravo XZ One		22-88847A1	S/N: 0L914990 through 0M999999
MerCruiser	Hi Performance Transom		22-88847A1	S/N: 0W150003 & Up
MerCruiser	Integrated Transom		22-88847A1	S/N: 0M052768 & Up; All through 0M052767
MerCruiser	MC I, MC I R, MR		22-88847A1	Port and Starboard templates included
MerCruiser	MC-TR and TRS		22-88847A1	Separate template included

Technical Specs

Product Type: Gimbal Ring Access Plug Kit
Installation: Surface mount with templates
Product Dimensions: 5.0" H x 4.0" W x 1.0" L
Weight: 0.06 kg (0.13 lb)
Fitting Type: 1-1/8" (28.5 mm) access holes with pipe plug
Thread Size: 1 in. NPT
Other Technical Attributes: Templates included for accurate hole placement

What’s in the Box

1 x Pipe Plug (22-88847) - Qty: 2
1 x Swivel Shaft Nut (211-88462), 3/4 in. - 16
1 x Template Kit

Installation Notes

Select the correct template from the included kit that matches your sterndrive model.
Position the template on the gimbal housing as instructed by the guide marks.
Carefully drill pilot holes to ensure accurate placement.
Use a 1-1/8 in. (28.5 mm) hole saw to cut the main access hole.
Tap the newly created hole using a 1 in. NPT tap to create the necessary threads.
Perform the required service on the gimbal ring through the access hole.
Once service is complete, securely install the NPT pipe plug to seal the opening.

Special Tools Required (Not Included): A 1-1/8 in. (28.5 mm) Hole Saw and a 1 in. NPT Tap are necessary for installation.

Troubleshooting & FAQ

How do I know which template to use for my drive?

The kit contains different templates for various MerCruiser model families. For example, MC I/R/MR & Alpha One models use one set of templates, while MC-TR/TRS drives use another. Match the drawing and instructions on the template to your specific sterndrive unit.

Will this kit really let me avoid removing the engine?

Yes, that is the primary function of this kit. By creating a precisely placed access port on the gimbal housing, it allows you to reach the swivel shaft nut for gimbal ring service without undertaking the major task of engine and transom removal.

What are symptoms of a failing gimbal ring or swivel shaft?

Common signs include stiff or difficult steering, a noticeable "clunk" or excessive play when turning the wheel, or grinding noises from the transom area. A visual inspection may reveal corrosion or damage to the swivel shaft when the drive is trimmed up.

Can the access plugs be removed and reinstalled later?

Yes, the included NPT (National Pipe Thread) plugs are designed to be removable for future service. Always inspect the threads for damage or sealant residue before reinstallation to ensure a watertight seal.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

Payment & Security

Payment methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.