16-866563 16-818834 Gimbal Housing Stud 4.25" for Mercruiser Alpha Gen II Bravo I II III | JLM Marine

Gimbal Housing Stud 4.25" – Fits Mercruiser Alpha Gen II, Bravo I, II, III

This Gimbal Housing Stud Kit is designed for Mercruiser stern drive applications, including Alpha Gen II and Bravo I, II, and III series. Each stud measures 4.25 inches and is engineered to secure the gimbal housing assembly reliably during operation.

This kit serves as a direct replacement for OEM part numbers 16-866563, 16-818834, 818834, and 866563, ensuring seamless fitment and durability for your stern drive system.

• Complete stud kit for gimbal housing replacement
• Compatible with Alpha Gen II and Bravo I, II, III stern drives
• Precision-engineered to OEM specifications

Part Number Cross-Reference

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

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.

Technical Specifications

Package Contents

This kit includes:

• 1× Gimbal Housing Studs Kit (The package contains all the parts shown in the picture.)

Installation Guide

1. Disconnect the battery and ensure the stern drive is safely supported before beginning work.
2. Remove the stern drive unit from the transom assembly following your service manual procedures.
3. Locate the existing gimbal housing studs on the transom plate or gimbal housing.
4. Carefully remove the old studs using the appropriate removal tool or stud extractor. Inspect the threads in the housing for damage.
5. Clean the threaded holes thoroughly with a wire brush and solvent to remove debris, corrosion, or old thread-locking compound.
6. Apply a marine-grade thread-locking compound to the threads of the new studs to prevent loosening under vibration.
7. Thread each new stud by hand into the gimbal housing until finger-tight, ensuring proper alignment.
8. Torque the studs to the manufacturer's specified torque setting using a calibrated torque wrench.
9. Reinstall the stern drive unit, ensuring all mounting hardware is properly aligned with the new studs.
10. Tighten all mounting nuts evenly in a cross-pattern to the correct torque specification.
11. Reconnect the battery and perform a visual inspection to confirm all fasteners are secure.
12. Conduct a test run to verify proper installation and operation of the stern drive system.

Troubleshooting & FAQ

Q: How do I confirm this fits my stern drive?
A: Verify that your Mercruiser stern drive is an Alpha Gen II, Bravo I, Bravo II, or Bravo III model. Cross-reference the OEM part numbers (16-866563, 16-818834, 818834, 866563) with your service manual or the existing studs.

Q: What are the signs that gimbal housing studs need replacement?
A: Common indicators include visible corrosion or rust on the studs, stripped or damaged threads, difficulty removing or tightening mounting nuts, or excessive play in the stern drive mounting.

Q: Can I reuse old studs if they look okay?
A: It's not recommended. Gimbal housing studs experience high stress and vibration, and even minor thread wear can compromise the integrity of the stern drive mounting.

Q: Should I use thread locker on these studs?
A: Yes, apply a marine-grade medium-strength thread-locking compound to prevent the studs from loosening due to vibration and thermal cycling.

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.

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.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use.

Important Notes

• Verify that the product images and specifications match your original part.
• 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.