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OEM Mercury Gearcase Drain Plug Seal Washer
Mercury Drain Plug Seal 8M0204693 Replaces 830749
The Mercury 8M0204693 drain plug seal is a genuine OEM Mercury sealing washer used on many Mercury and Mariner outboards, Mercury Racing lower units, Verado gearcases, and MerCruiser sterndrives.
This seal replaces Mercury part number 830749 and is commonly used on lower unit drain screws, vent screws, and gear lube fill plugs to help prevent gearcase lubricant leaks during operation and storage.
Common Compatible Applications
| Application Family | Common Models | Use Location | OEM References |
|---|---|---|---|
| Mercury & Mariner Outboards | EFI, DFI, Optimax, FourStroke, SeaPro, Pro XS | Gearcase Drain & Fill Screws | 8M0204693, 830749 |
| Mercury Verado | L4, L6, V6 & V8 Verado Models | Lower Unit Drain & Vent Screws | 8M0204693, 830749 |
| Mercury Racing | 150R, 200R, 250R, 300R, 450R, 500R | SportMaster & Racing Gearcases | 8M0204693, 830749 |
| Mercury Racing Gearcases | SportMaster, TorqueMaster, HD Lower Units | Drain & Fill Screw Seal | 8M0204693, 830749 |
| MerCruiser Sterndrives | Alpha, Bravo, Blackhawk, NXT | Gear Lube Drain & Vent Screws | 8M0204693, 830749 |
| MerCruiser Performance Drives | M-Series, Zeus, Vazer | Gearcase Drain Plug Seal | 8M0204693, 830749 |
Mercury uses this drain plug sealing washer across a very large number of outboard lower units, Verado gearcases, Racing gearcases, and MerCruiser sterndrive applications.
The best way to confirm fitment is by matching your original seal or OEM part number.
Common OEM references include: 8M0204693 and 830749.
OEM Part Numbers & Cross References
| Brand | Part Number |
|---|---|
| Mercury | 8M0204693 |
| Mercury | 830749 |
What This Drain Plug Seal is Used For
The Mercury 8M0204693 seal washer is used during lower unit and sterndrive gear lube service to help seal drain screws and vent screws against lubricant leaks.
Replacing the seal washer during gear lube service helps maintain proper sealing pressure and helps reduce the risk of water intrusion into the gearcase.
Mercury recommends replacing drain plug seals during routine lower unit service and gear lube changes.
Key Features and Benefits
- Genuine OEM Mercury drain plug seal washer
- Replaces Mercury part number 830749
- Fits many Mercury outboards and MerCruiser sterndrives
- Fits Verado, Pro XS, Racing, FourStroke, and Optimax applications
- Fits many SportMaster and TorqueMaster gearcases
- Commonly used during lower unit gear lube service
- Helps prevent gear lube leaks and water intrusion
- Used on drain screws, vent screws, and fill plugs
- Designed for harsh marine environments
Part Details
- Part Number: 8M0204693
- Supersedes: 830749
- Product Type: Drain Plug Seal Washer
- Brand: Mercury Marine
- Application: Mercury Outboards & MerCruiser Drives
- Use Location: Lower Unit Drain, Fill & Vent Screws
- OEM Mercury Part: Yes
FAQ
What does Mercury 8M0204693 replace?
This drain plug seal replaces Mercury part number 830749.
What is this seal used for?
It seals lower unit drain screws, vent screws, and gear lube fill plugs
on Mercury outboards and MerCruiser sterndrives.
Does this fit Mercury Racing lower units?
Yes. This seal is commonly used on Mercury Racing SportMaster,
TorqueMaster, and HD lower units including 300R, 450R, and 500R applications.
Does this fit MerCruiser sterndrives?
Yes. This seal is used on many Alpha, Bravo, Blackhawk, NXT, Zeus,
and M-Series sterndrives.
Should drain plug seals be replaced during service?
Yes. Mercury recommends replacing drain plug seals during routine
gear lube service to help prevent leaks and water intrusion.
Is this a genuine Mercury part?
Yes. This is a genuine OEM Mercury Marine drain plug sealing washer.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed seals and washers are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0204693, 830749, Mercury drain plug seal, Mercury drain screw washer, Mercury gearcase washer, Mercury lower unit seal, Mercury gear lube washer, Mercury vent screw seal, Mercury drain plug gasket, Verado drain plug seal, Mercury Pro XS drain seal, Mercury Racing drain washer, Mercury 500R drain plug seal, Mercury 450R drain plug washer, SportMaster drain plug seal, TorqueMaster washer, Mercury Bravo drain washer, Mercury Alpha drain washer, MerCruiser drain plug seal, MerCruiser Bravo washer, MerCruiser Alpha washer, Mercury gearcase drain seal, Mercury lower unit washer, Mercury fill screw seal, Mercury OEM washer
18-2430-9
18-24301-9
8M0204693
830749
12596A2
12596A4
12596T2
8M0168901
8M0214927
812966A3
812966A7
812966A9
9-43330
848840A1
848840T1
818290A8
818290T8
OEM Mercury Driveshaft Oil Seal Carrier
Mercury 2.5L & 3.0L EFI / DFI Gearcase Seal Carrier
This genuine OEM Mercury driveshaft oil seal carrier fits select Mercury 2.5L and 3.0L EFI and DFI outboards using compatible gearcase assemblies.
The seal carrier supports the driveshaft sealing system in the upper gearcase area to help retain gear lube and prevent water intrusion into the lower unit.
Compatible Applications
| Engine Family | Engine Type | Application | Application Notes |
|---|---|---|---|
| Mercury 2.5L | EFI Outboards | Gearcase Driveshaft Seal Area | Select high-performance lower units |
| Mercury 2.5L | DFI Outboards | Gearcase Driveshaft Seal Area | Select OptiMax applications |
| Mercury 3.0L | EFI Outboards | Gearcase Driveshaft Seal Area | Select EFI lower units |
| Mercury 3.0L | DFI Outboards | Gearcase Driveshaft Seal Area | Select OptiMax and DFI applications |
| Alpha One Gen II | Sterndrive | Upper Gear Housing | Select sterndrive applications |
Always verify your engine serial number and gearcase application before ordering lower unit sealing components.
OEM Part Numbers & Cross References
| Type | Part Number |
|---|---|
| Current Mercury OEM Number | 8M0214948 |
| Mercury Cross Reference | 807929A1 |
| Mercury Cross Reference | 807929A2 |
| Mercury Cross Reference | 815922A1 |
| Mercury Cross Reference | 815922A5 |
| Mercury Cross Reference | 821759A1 |
| Mercury Cross Reference | 821759A2 |
| Mercury Cross Reference | 821759A3 |
| Mercury Cross Reference | 821759A4 |
| Pro Marine Part Number | 65354P |
What This Driveshaft Oil Seal Carrier is Used For
This Mercury driveshaft oil seal carrier is installed in the upper area of compatible outboard gearcases and sterndrive gear housings.
The carrier supports the driveshaft oil seals and sealing surfaces while helping prevent water intrusion and gear lube leakage.
Corrosion, seal wear, damaged sealing surfaces, or improper installation can contribute to lower unit leaks and gearcase contamination.
Seal carriers are commonly replaced during lower unit rebuild service, driveshaft resealing, or when corrosion damages the seal bore area.
Key Features and Benefits
- Genuine OEM Mercury driveshaft oil seal carrier
- Fits select Mercury 2.5L and 3.0L EFI / DFI outboards
- Also fits select Alpha One Gen II sterndrive applications
- Supports proper driveshaft seal alignment
- Helps prevent water intrusion into the lower unit
- Helps retain gear lube inside the gearcase
- Common replacement during lower unit rebuild service
- OEM Mercury fit and sealing compatibility
Driveshaft Seal Carrier Details
- Brand: Mercury Marine
- Part Type: Driveshaft Oil Seal Carrier
- Current OEM Number: 8M0214948
- Cross References: 807929A1, 807929A2, 815922A1, 815922A5, 821759A1, 821759A2, 821759A3, 821759A4
- Applications: Mercury 2.5L & 3.0L EFI / DFI Outboards
- System: Lower Unit / Gearcase
- Use: Driveshaft sealing and gearcase reseal service
FAQ
What engines does this seal carrier fit?
This carrier fits select Mercury 2.5L and 3.0L EFI and DFI outboards along with certain Alpha One Gen II applications.
What does a driveshaft seal carrier do?
The seal carrier supports the driveshaft oil seals and helps prevent water intrusion and gear lube leakage inside the lower unit.
Why would this part need replacement?
Common causes include corrosion, damaged sealing surfaces, water intrusion, or lower unit rebuild service.
Does this replace older Mercury assemblies?
Yes. This carrier replaces several earlier Mercury part numbers including 807929A1, 815922A5, and 821759A4.
Should the lower unit be pressure tested after installation?
Yes. Pressure and vacuum testing is recommended after seal service to verify proper sealing.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Lower unit sealing components should be installed only after proper inspection and diagnosis.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
65354P, 8M0214948, 807929A1, 807929A2, 815922A1, 815922A5, 821759A1, 821759A2, 821759A3, 821759A4, Mercury seal carrier, driveshaft oil seal carrier, Mercury 2.5L seal carrier, Mercury 3.0L seal carrier, Mercury EFI lower unit seal, Mercury DFI gearcase seal carrier, Mercury OptiMax seal carrier, Alpha One Gen II seal carrier
807929A1
807929A2
815922A1
815922A5
821759A1
821759A2
821759A3
821759A4
9-43714
90206
90206-22M19-00
225hp EFI
Yamaha
2 Stroke
115hp 1984-2010
130hp 1984-2004
150hp 1984-2009
175hp 1984-2000
200hp 1984-1999
225hp 1990-1997
250hp 1990-1995
S115, S130, S150, S175, S200, S225, S250
LX / LZ 150, 200, 250, 300
V150, 175, 200, 225
VZ/Z 150, 175, 200, 225, 250, 300
4 Stroke
F75 2017 & Up
F90 2016 & Up
F115 2000 & Up
F150 2004 & Up
F175 2014 & Up
F200 2002 & Up
F225 2002-2018
F250 2005-2018
8814372
93210-54M14-00
93210-54534-00
93210-55M14-00
93210-55051-00
78318
85222
888694
93101-28M16-00
30320
43047
430471
430472
8M0214931