Mercury MerCruiser Quicksilver — Oil Pan Stud Nut — 8M0148822
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Mercury MerCruiser Quicksilver Oil Pan Stud Nut 5/16-18 – 8M0148822
Keep your oil pan hardware exactly as the factory intended. The genuine Mercury MerCruiser Quicksilver 8M0148822 is a 5/16-18 oil pan stud nut used on select GM-based MerCruiser gasoline engines, securing the oil pan reinforcement to the oil pan studs for a firm, even clamp on the pan gasket. It replaces earlier Mercury nut 11971.
Compatible Applications
- MerCruiser 4.3L / 262 CID V6
- MerCruiser 5.7L / 350 V8
- MerCruiser 350 MAG / 350 MAG MPI
- MerCruiser Black Scorpion 350 MAG
- MerCruiser MX 6.2L MPI / Black Scorpion 6.2L
- Other GM-based MerCruiser inboard, ski and sterndrive engines using the same oil pan stud arrangement
Confirm fitment against your engine serial number and oil pan parts diagram before ordering.
Part Details
- Part number: 8M0148822
- Brand: Mercury MerCruiser / Quicksilver
- Product type: Oil Pan Stud Nut
- Thread: 5/16-18 UNC (.312-18)
- System: Engine Lubrication / Oil Pan
- Diagram position: Oil pan reinforcement to oil pan stud
- Supersedes: 11971 / 11-11971
- Typical quantity: 2–4 per applicable assembly
- Condition: New, genuine OEM
Key Features
- Genuine Mercury Marine OEM fastener
- Correct 5/16-18 thread for the factory oil pan studs
- Keeps the original pan reinforcement hardware arrangement intact
Serial Number Fitment Notice
MerCruiser used several different oil pan screws, studs and nuts across similar GM engine families. Verify fitment by OEM number and diagram position for your engine serial number.
When This Part Needs Replacement
Replace the nut if the threads or flats are damaged, corrosion is significant, or it no longer tightens correctly on the oil pan stud. Inspect the stud and reinforcement plate whenever the pan is removed.
Related Parts
- 11989 – Oil Pan Stud
- 14257 – Port Oil Pan Reinforcement
- 14256 – Starboard Oil Pan Reinforcement
- 8M0150304 / 8M0185584 – Oil Pan Gasket (application dependent)
- 8M0077608 – Drain Screw Gasket
Technical FAQ
Does this replace part 11971?
Yes. 8M0148822 is the current replacement for 11971 / 11-11971.
Is this the same as the oil pan screws around the pan?
No. This nut threads onto the oil pan reinforcement studs, not the surrounding pan screws.
What torque should I use?
Tighten to the service specification for your exact engine, as listed in the service manual.
Parts Desk Insights
Best use: Replacing damaged or corroded nuts on the oil pan reinforcement studs during an oil pan gasket job or pan service.
Most common mistake: Ordering this nut to replace the perimeter oil pan screws. It is used only on the reinforcement studs, so check the diagram position first.
Sizing and fitment: Thread is 5/16-18 UNC. If you are replacing a full set, count the studs on your pan, as most applicable assemblies use 2–4 nuts, and match the OEM number to your engine serial number diagram.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
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.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.