Mercury MerCruiser Bearing Carrier Retaining Ring 35128 | Alpha One SS / SSM / Early Drives

Mercury MerCruiser Bearing Carrier Retaining Ring — Part No. 35128

This is the genuine Mercury Marine OEM bearing carrier retaining ring listed under part number 35128. Current Mercury assembly references identify it specifically as the large, late-style bearing carrier retaining ring, used in the gimbal housing and propshaft / bearing carrier area on select older MerCruiser stern drive assemblies. This ring holds the bearing carrier securely in position within the housing — correct condition and proper seating are essential for drive integrity and propshaft alignment.

Part Details

• Part Number: 35128
• Type: Bearing Carrier Retaining Ring — Large, Late Style
• Assembly Location: Gimbal housing / bearing carrier area; propshaft assembly on select racing and performance drives
• Approximate Packaged Size: 4.00 x 4.00 x 0.18 in.
• Approximate Weight: 0.06 lb (27 g)
• GTIN / UPC: 745061137950
• Type: Genuine Mercury Marine OEM replacement retaining ring

Compatible Applications

• MerCruiser Alpha One SS — 1986–1989, gimbal housing bearing carrier location per diagram
• MerCruiser SSM II / SSM III / SSM IV / SSM V — 1982–1995, per diagram
• MerCruiser IA / IB / IC — 1964, gimbal housing assembly per diagram
• MerCruiser II — 1964–1967, gimbal housing assembly per diagram
• Select Mercury Racing / performance stern drive gear housing (propshaft) applications — where diagram specifies 35128

Confirm fitment by exact drive model, serial number, and the correct gimbal housing or bearing carrier diagram before ordering. Early MerCruiser stern drives use multiple retaining rings in nearby assemblies — this part is specifically the large, late-style bearing carrier ring. Do not order by ring size or appearance alone.

Diagram Position

Part 35128 is positioned in the gimbal housing / exhaust hose assembly on early MerCruiser drives and in the gear housing assembly (propshaft) on select racing and performance stern drives. The exact diagram and style break (early vs. late style) must be confirmed for the specific drive serial number being serviced before ordering.

Alternate & Superseded Part Numbers

• 35128 — current active Mercury OEM reference

No clearly supported superseding Mercury part number was identified in current sources. Confirm current status via Mercury dealer parts lookup for the specific drive serial number.

When to Replace

Replace this retaining ring if it is bent, corroded, fatigued, cracked, or damaged during disassembly. Because this ring retains the bearing carrier in the gimbal housing or propshaft assembly, a ring that no longer seats and holds securely should always be replaced — not reused. On older drives with significant service history, proactive replacement during any bearing carrier or gimbal housing service is the right approach.

Installation Tips

• Confirm the exact diagram and style break (large, late-style) for the drive serial number being serviced before installing
• Inspect the retaining ring groove in the housing for corrosion, damage, or debris before fitting the new ring
• Ensure the ring seats fully and evenly in the groove — a partially seated retaining ring will not hold the bearing carrier correctly
• Use the correct retaining ring pliers for installation — do not use improvised tools that could distort the ring
• Verify the bearing carrier is fully seated before installing the retaining ring

Technical FAQ

Q: What is the difference between early-style and late-style retaining rings on these drives?
A: Early MerCruiser stern drives used different retaining ring specifications at the bearing carrier location as the design evolved. The “late style” designation on 35128 refers to the updated ring specification used on later production runs of the affected drive models. Confirm which style applies to the specific drive serial number via the Mercury parts diagram.

Q: Are there other retaining rings in the same assembly area?
A: Yes. Early MerCruiser gimbal housing and propshaft assemblies use multiple retaining rings in nearby locations. Part 35128 is specifically the large bearing carrier ring — other rings in the same assembly area have different part numbers. Always match by diagram position and part number, not by ring size alone.

Q: My drive serial number isn’t listed — will this fit?
A: Fitment on older MerCruiser drives must be confirmed by serial number and diagram. If you’re unsure which retaining ring applies to your specific drive, our parts team can help verify before you order.

Parts Desk Insights

Best use case: This retaining ring is the right call for a technician doing gimbal housing, bearing carrier, or propshaft service on an Alpha One SS, SSM II–V, or early MerCruiser drive where the diagram specifically calls for 35128 as the large, late-style bearing carrier ring. It’s a precision retention component — not a generic snap ring — and it belongs in the hands of someone working from the correct Mercury service manual and diagram for the specific drive serial number.

Common issues: The most frequent problem is ordering by ring size or the generic “retaining ring” description rather than by part number and diagram position. Early MerCruiser drives use multiple retaining rings in nearby locations, and selecting the wrong one delays the job. The second common issue is reusing a retaining ring that was bent or distorted during removal — a ring that has been deformed will not seat correctly and should always be replaced.