Mercury MerCruiser Quicksilver OEM Oil Pan Gasket Set 810846T | 3.0L 3.0LX GM 181 I/L4 One-Piece
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Mercury MerCruiser Quicksilver OEM Oil Pan Gasket Set — Part 810846T
- Part Number: 810846T
- Full Catalog Number: 27-810846T
- Brand: Mercury Marine / MerCruiser / Quicksilver (Genuine OEM)
- Official Product Type: Internal Engine Gaskets — One-Piece Oil Pan Gasket Set
- System: Engine Lower End — oil pan-to-block sealing surface
- Engine Family: GM 3.0L / 3.0LX 181 CID Inline-4 Marine Gasoline Engine
- Gasket Style: One-piece RM seal oil pan gasket
- Supersedes: 810846 / 27-810846 (earlier Mercury oil pan gasket set)
- GTIN / UPC: 745061300002
- Weight: approx. 0.1 kg
Important: Do not confuse 810846T with 810846A05, which is a complete engine overhaul gasket set. The 810846T is specifically the oil pan gasket set for the 3.0L / 3.0LX GM 181 CID engine.
What It Does
The 810846T is the genuine OEM one-piece oil pan gasket used in MerCruiser GM 3.0L and 3.0LX 181 CID inline-four marine engines. It seals the joint between the engine block and oil pan, preventing oil from leaking at the oil-pan flange. Mercury parts diagrams place 810846T directly between the GM 3.0L engine block and oil pan, and it is the current OEM replacement for the earlier 810846 / 27-810846 gasket in applicable production ranges. A used one-piece oil-pan gasket should be replaced once the pan has been removed rather than reused — reinstalling a compressed gasket is a common cause of oil pan leaks returning after service.
Compatible Applications
Confirm fitment by engine serial number before ordering. Older 3.0L engines can use a different oil-pan sealing arrangement, and serial-number verification is the most reliable method.
MerCruiser 3.0L GM 181 I/L4
- 1990–1994: serial range 0C856559 through 0F353099
- 1998 production: serial range 0L010042 through 0L096999
- Serial range 0L097000 through 0W301999
- Serial range 0W302000 through 1A001999
- Serial range 1A002000 through 1A020543
- Serial range 1A020544 and up
MerCruiser 3.0LX GM 181 I/L4
- 1990–1995: serial range 0C856559 through 0F603999
- 1996–1997: serial range 0F604000 through 0K999999
MerCruiser 3.0L MPI EC
- Serial range 1A072812 and up
MerCruiser 3.0L TKS Plus
- Serial range 1G404114 through 1G414332
- Serial range 1G700000 through 1G799999
Selected 3.0L Crate Engines
- Serial range 1G800000 through 1G899999
Not sure it fits? Send us your MerCruiser engine serial number before ordering.
Related Oil Pan Assembly Components
Mercury parts diagrams show the following components in current 3.0L oil-pan assemblies alongside 810846T. These are sold separately and are not included with the gasket set:
- 8M0122492 — Oil pan
- 8M0239812 — Timing cover gasket
- 97335 — Oil seal
- 49956 — Oil pan drain screw
- 8M0077608 — Drain plug gasket
Inspect the oil pan drain plug and gasket while the pan is accessible and replace if worn. If the oil pan itself is corroded or distorted around the bolt flange, straightening or replacing the pan is necessary before the new gasket will seal correctly.
Part Numbers & Cross-References
- 810846T — Current Mercury Marine OEM reference
- 27-810846T — Full Mercury / Quicksilver catalog format
- 810846 / 27-810846 — Earlier Mercury gasket set; superseded by 810846T
- Sierra 18-1239 — Aftermarket cross-reference
- Mallory 9-61500 — Aftermarket cross-reference
- Volvo Penta 3853343 — Cross-reference for the same GM 3.0L engine family
- OMC 914820 / 0914820 — Cross-reference for the same GM 3.0L engine family
When to Replace
Replace the oil pan gasket when:
- Engine oil is leaking around the oil-pan flange
- The oil pan is removed for any engine service
- The gasket is crushed, split, or hardened during inspection
- The engine is being rebuilt or resealed
- The oil pan is being replaced
- Corrosion or damage around the pan flange requires disassembly and inspection
Service Interval
No fixed replacement interval — replace whenever the oil pan is removed. Do not reuse a one-piece oil-pan gasket after the pan has been pulled. Inspect the oil-pan flange and drain plug at each oil change; if any seepage is found at the pan-to-block joint, plan for gasket replacement at the next scheduled service.
Installation Notes
- Clean the engine-block and oil-pan sealing surfaces completely and remove all old gasket material before installing the new gasket
- Inspect the oil pan for corrosion or distortion around the bolt flange — a warped pan flange will not seal correctly with a new gasket and the pan will need to be straightened or replaced
- Check the rear and front sealing areas carefully for corrosion or damage
- Inspect the oil-pan drain plug and drain plug gasket while the pan is accessible and replace if worn
- Follow the applicable MerCruiser service-manual bolt tightening sequence and torque specifications for the 3.0L engine — do not use a generic torque value
- Avoid overtightening the oil-pan fasteners — overtorquing can distort the pan flange and compromise the new gasket
Technical FAQ
Q: What is the difference between 810846T and 810846A05?
They are completely different products. 810846T is the oil pan gasket set for the GM 3.0L / 181 CID engine. 810846A05 is a full engine overhaul gasket set covering many more sealing points throughout the engine. If you only need to reseal the oil pan, 810846T is the correct part.
Q: Can I reuse my old oil pan gasket?
No. A one-piece oil-pan gasket that has been in service is compressed and will not reseal reliably after the pan is refitted. Replace the gasket whenever the oil pan is removed.
Q: My engine is a Volvo Penta or OMC with the GM 3.0L engine. Does 810846T fit?
The same GM 3.0L / 181 CID engine block was used across multiple marine brands. Volvo Penta references 3853343 and OMC references 914820 cross to the same gasket configuration. Confirm against the parts diagram for your specific engine package and serial number before ordering.
Q: My 3.0L is leaking at the oil pan but the gasket looks intact. What else should I check?
A distorted oil-pan flange is a common cause of persistent oil-pan leaks even after gasket replacement. If the pan bolts were previously overtightened, the flange can be compressed or warped enough that a new gasket will not seal in the same spots. Remove the pan and check the flange for flatness before installing the replacement gasket.
Parts Desk Insights
The key thing with 810846T is confirming the engine serial number, because older 3.0L engines used a different oil-pan sealing arrangement and not all 3.0L gaskets interchange across the full production range. The serial number ranges in the compatibility section cover most of the engines where this gasket is used, but if an older engine comes in, always check the diagram rather than assuming. The other issue we see regularly is customers replacing the gasket without inspecting the oil-pan flange first. If the pan has been overtightened at some point, the flange can be warped enough that a new gasket will not seal the same spots that were leaking. Straightening or replacing the pan is the fix — not a thicker aftermarket gasket. Inspect the drain plug and drain gasket at the same time; it is right there and they are inexpensive.
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
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