Mercury MerCruiser Double Yoke U-Joint 393831
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Mercury MerCruiser 393831 is a genuine OEM double yoke driveline component used in MerCruiser sterndrive applications. It is commonly identified in current OEM parts sources as the double yoke or center socket in the U-joint driveline assembly, used between the drive shaft U-joints in the upper drive connection.
Key Features
- Genuine Mercury MerCruiser Quicksilver OEM part
- Double yoke / center socket style driveline component
- Used in U-joint drive assemblies
- Common OEM part number: 393831
- GTIN commonly listed as 745061141179.
Engine Compatibility
Current OEM listings show 393831 used on MerCruiser R/MR/Alpha One sterndrive and transom assembly applications from 1983–1990 within the listed serial ranges, and also on Bravo, Bravo Two, and Bravo Three applications in the listed serial ranges. Aftermarket cross-reference sources also describe it as fitting MerCruiser #1 and Alpha units above serial number 1684188, plus TR, TRS, and Bravo applications. Fitment should still be confirmed by drive model and serial number before ordering.
Serial Number Fitment Notice
Fitment should be confirmed by sterndrive model and serial number, not by engine family alone. This part is a driveline match item, and correct application depends on the specific drive and U-joint assembly configuration.
When This Part Needs Replacement
Replace when the original double yoke shows bore wear, brinelling, rust damage, looseness at the U-joint bearing caps, driveline play, or damage during U-joint service. Because this is a structural driveline component, any visible wear or distortion is reason for replacement.
Installation Notes
Install only on the correct MerCruiser driveline application. One established MerCruiser parts source notes this version uses 1.079 bore holes for the matching U-joints and that some newer drives after about 2000 use a larger center socket, so size confirmation is important before ordering.
Alternate / Superseded Part Numbers
393831
39383T
Sierra 18-2128
OMC 912213
Volvo Penta 3850813
Mallory 9-72403.
Parts Desk Insight
This part is often described two different ways in the market: “double yoke” in OEM catalogs and “center socket” in service and aftermarket listings. They are referring to the same core driveline piece for 393831, so the safest match is always by OEM part number plus drive serial number.
Shipping
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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