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Mercury Outboard Parts
Shop OEM and aftermarket Mercury outboard parts for maintenance, repair, troubleshooting, and complete engine rebuild projects. Browse Mercury marine parts by system, including cooling, fuel delivery, electrical and ignition, internal engine components, lower unit parts, steering, trim, and routine service items.
Pro Marine USA carries Mercury outboard engine parts for a wide range of 2-stroke, FourStroke, EFI, Optimax, Pro XS, SeaPro, and Verado applications. Use your engine horsepower, model, serial number, or OEM part number whenever possible to confirm fitment before ordering.
Shop Mercury Outboard Parts by System
- Complete Powerheads
- Control Cables & Boxes
- Cooling System
- Cowlings & Components
- Electrical System
- Engine Oil
- Engine Rebuild Kits
- Fuel & Carburetion System
- Intake System
- Internal Engine Components
- Lower Unit Components
- Oiling System
- Paints
- Service & Oil Change Kits
- Service Manuals
- Steering Systems
- Throttle Components
- Transom & Midsection
- Trim System
- Wizard Performance Parts
Find the Correct Mercury Outboard Part
Mercury outboard parts can vary by horsepower, engine family, model year, and serial number range. If you are unsure which component fits your engine, use the OEM parts lookup to locate the original Mercury part number from an engine diagram.
Once you have the OEM part number, search Pro Marine to find available genuine Mercury and aftermarket replacement options.
Use Our OEM Parts Lookup »Common Mercury Outboard Engine Families
Pro Marine supports many Mercury outboard applications across a wide horsepower range. Always confirm the engine serial number and model information before ordering parts.
- Portable and Midrange: Mercury 2.5HP through 60HP 2-stroke and FourStroke applications
- FourStroke and EFI: common 75HP through 300HP Mercury EFI and FourStroke platforms
- Pro XS: performance-oriented Mercury Pro XS outboards across multiple engine families
- Optimax: direct-injected 2-stroke Mercury Optimax engines, commonly 75HP through 250HP
- Verado: supercharged and naturally aspirated Mercury Verado applications from 135HP through current high-horsepower platforms
- SeaPro: commercial-duty Mercury SeaPro outboards used in professional and high-hour applications
Common Mercury Outboard Repair Areas
- Overheating: inspect the water pump, impeller, thermostat, poppet valve, cooling passages, and related cooling components.
- Hard starting or rough running: inspect fuel pumps, filters, injectors or carburetors, spark plugs, coils, sensors, and intake components.
- No spark or intermittent ignition: check ignition coils, stators, switch boxes, trigger assemblies, sensors, grounds, and wiring.
- Low compression or power loss: inspect pistons, rings, cylinders, bearings, gaskets, reeds, and internal engine components.
- Lower unit noise or water intrusion: inspect seals, bearings, gears, shafts, bearing carriers, and gear lube condition.
- Trim or steering problems: inspect trim motors, pumps, hydraulic components, steering cylinders, hoses, and related rigging parts.
Why Buy Mercury Outboard Parts from Pro Marine USA?
- OEM Mercury and aftermarket replacement options for many common applications.
- Parts for maintenance, repair, engine rebuilding, lower units, electrical systems, fuel systems, steering, trim, and rigging.
- OEM diagram and part-number lookup tools to help identify the correct part before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large inventory of Mercury service parts and hard-to-find marine engine components.
- Fast weekday shipping on qualifying in-stock orders.
Frequently Asked Questions
How do I find the correct Mercury outboard part?
Use the engine horsepower, model, serial number, and year whenever available. Mercury frequently uses serial-number ranges to identify engine families, so the serial number is often the most reliable way to confirm fitment.
Can I search Mercury parts by OEM part number?
Yes. Enter the Mercury OEM part number into the Pro Marine site search to locate available OEM and aftermarket replacement options. If you do not know the part number, use the OEM parts lookup first.
Do Mercury outboard parts vary by serial number?
Yes. Many Mercury components change by serial-number range even within the same horsepower or model family. Always compare the serial range listed for the part with your engine before ordering.
Do you carry parts for Mercury Optimax and Verado engines?
Yes. Pro Marine carries parts for many Mercury Optimax, Verado, Pro XS, EFI, FourStroke, and SeaPro applications, including maintenance, fuel, electrical, cooling, internal engine, lower unit, steering, and rigging components.
Do you carry both OEM and aftermarket Mercury parts?
Yes. Pro Marine offers genuine Mercury parts along with aftermarket replacement parts for many common Mercury outboard maintenance, repair, and rebuild applications.
What Mercury outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump kits, impellers, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Mercury outboard parts often vary by serial-number range. Confirm your engine serial number and OEM part number whenever possible before ordering.
012-1M
16420
16420
18-1195
43012A03
43012A03
43012A04
43012A04
43012A05
43012A1
43012A1
8M0235070
816567
816567A1
844338A01
859469A1
859469A1
35126
526-15
52614
81500
89224
32870
508991
75786
F532555
18-7467
509008
54030
Pro Marine Upper and Lower Crankshaft Oil Seal - 230
The Pro Marine 230 Upper and Lower Crankshaft Oil Seal is an aftermarket replacement designed for select Mercury, Mariner, Johnson, and Evinrude outboard applications. It is cross-referenced to Mercury part number 41953 and numerous additional OEM and aftermarket numbers.
This crankshaft seal is used in compatible two-stroke outboard engines to help maintain proper crankcase sealing around the crankshaft. It is suitable for applicable upper or lower crankshaft sealing locations, depending on the engine configuration.
Mercury application records include select 30-125 HP inline outboards, 135-200 HP V6 engines, 2.5L EFI models, and high-performance engines, along with several Mercury SportJet configurations.
For customers who prefer a factory replacement, Pro Marine USA also carries the Genuine Mercury 41953-OE Crankshaft Oil Seal .
Product Information
- Part Number: 230
- Manufacturer: Pro Marine
- Product Type: Aftermarket Crankshaft Oil Seal
- Seal Application: Upper or Lower Crankshaft, Depending on Engine
- Engine Brands: Mercury, Mariner, Johnson, and Evinrude
- Mercury Outboard Fitment: Select 30-250 HP Engine Families
- Mercury SportJet Fitment: Select 175-240 HP Models
- Primary Mercury Reference: 41953
- Genuine Mercury Alternative: 41953-OE
OEM and Cross Reference Numbers
Pro Marine 230 is listed as an aftermarket replacement associated with the following OEM and aftermarket crankshaft oil seal numbers.
These numbers help identify replacement seals when servicing Mercury, Mariner, Johnson, and Evinrude outboard engines.
| Part Number | Reference |
|---|---|
| 230 | Pro Marine Aftermarket |
| 41953 | Mercury OEM Reference |
| 41953B | Mercury Reference |
| 41953-OE | Genuine Mercury Product Listing |
| 0313992 / 313992 | OEM Cross Reference |
| 0764337 / 764337 | OEM Cross Reference |
| 0777914 / 777914 | OEM Cross Reference |
| 336232 | OEM Cross Reference |
| 508514 | OEM Cross Reference |
| 775423 | OEM Cross Reference |
| 18-2016 | Aftermarket Cross Reference |
| 9-76100 | Aftermarket Cross Reference |
| 20079 | Cross Reference |
| 25837 | Cross Reference |
| 29476 | Cross Reference |
Cross-reference numbers are provided for part identification. Verify the original engine application before ordering.
What This Part Is Used For
The Pro Marine 230 crankshaft oil seal helps prevent unwanted air and fluid leakage around the crankshaft in compatible outboard engines.
In a two-stroke outboard engine, maintaining proper crankcase sealing is essential to the engine's operating cycle. The crankcase relies on pressure changes to support the movement of the air-fuel mixture.
A worn or damaged crankshaft seal may allow unwanted air to enter the crankcase, which can contribute to engine performance problems.
Common Applications
- Upper crankshaft oil seal replacement
- Lower crankshaft oil seal replacement
- Two-stroke outboard engine rebuilding
- Powerhead and crankcase repairs
- Crankshaft service and maintenance
- Repair of confirmed crankcase air leaks
- Restoration of older outboard engines
Important Fitment Information
Pro Marine 230 does not fit every Mercury, Mariner, Johnson, or Evinrude outboard engine.
Crankshaft oil seal dimensions and configurations vary between engine families and production ranges. Always confirm the original seal part number, engine model, and serial number.
The following Mercury applications are based on the supplied Mercury parts catalog fitment charts. Johnson and Evinrude compatibility should be verified by OEM part number and engine diagram.
Mercury and Mariner Outboard Fitment
Pro Marine 230 is cross-referenced to crankshaft oil seal applications found throughout multiple Mercury and Mariner outboard engine families.
The following tables summarize the supplied Mercury catalog application records. Fitment is specific to the listed engine models and serial-number ranges.
Mercury 30-60 HP Outboards
| Engine Model | Serial Number Range |
|---|---|
| 30 HP 2-Cylinder | 0G760300-0T079999 |
| 40 HP 2-Cylinder | 0G760300-0T079999 |
| 30 HP Jet 3-Cylinder | 0G760300-0T408999 |
| 40 HP 3-Cylinder | 0G760300-0T079999 |
| 50 HP 3-Cylinder | 0G760300-0T079999 |
| 30 and 40 HP 2-Cylinder | 0G055314-0G760299 |
| 50 and 60 HP 3-Cylinder | 6428681-0B122929 |
Mercury 65-125 HP Outboards
| Engine Model | Serial Number Range |
|---|---|
| 70, 75, 80 and 90 HP 3-Cylinder | 0B240451-0C221999 |
| 75 and 90 HP 3-Cylinder | 0C222000-0D283221 |
| 65 Jet, 75 and 90 HP | 0D283222-0G760299 |
| 65 Jet, 75 and 90 HP | 0G760300-0T979999 |
| 80 Jet, 100, 115 and 125 HP | 0D283222-0G760299 |
| 80 Jet, 100, 115 and 125 HP | 0G760300-0T979999 |
| 100 and 115 HP 4-Cylinder | 0A722297-0D283221 |
Mercury 135-200 HP V6 Outboards
Compatible catalog applications include select V135, V150, V175, V200, XR4, XR6, Magnum II, Magnum III, Marathon, and EFI engine configurations.
| Engine Family | Serial Number Range |
|---|---|
| V135, V150, XR4 and Magnum II | 0A904646-0C100860 |
| V135, V150, XR4, V175 and V200 | 0C100861-0C239552 |
| V135, V150, XR4, V175 and V200 | 0C239553-0D081999 |
| V150 XR2, Magnum, Marathon and Work | 4868998-0A904645 |
| V135, V150, XR6 Magnum III, V175 and V200 | 0D082000-0G303045 |
| V135, V150, XR6 Magnum III, V175 and V200 | 0G303046-0G760299 |
| V135, V150, XR6 Magnum III, V175 and V200 | 0G760300-0G960499 |
| V150, V175 and V200 | 0G960500-0T408999 |
Mercury 2.5L V6 and EFI Outboards
| Engine Model | Serial Number Range |
|---|---|
| 135, 150 and 175 HP V6 2.5L | 0G960500-0T178499 |
| 135, 150 and 175 HP V6 2.5L | 0T178500-0T800999 |
| 135, 150 and 175 HP V6 2.5L | 0T801000-1B226999 |
| 135, 150 and 175 HP V6 2.5L | 1B227000-1B417701 |
| 135, 150 and 175 HP V6 2.5L | 1B417702-1B580029 |
| 150 HP EFI 2.5L | 0T409000-0T800999 |
| 150 and 200 HP 2.5L | 0T801000-1B226999 |
| 150 and 200 HP 2.5L | 1B227000-2B121048 |
Mercury High-Performance Outboards
| Engine Model | Serial Number Range |
|---|---|
| 150 HP Pro Max / Super Mag | 0D935000-0G610079 |
| 200 HP EFI Pro Max / Super Mag | 0D935000-0G610079 |
| 150/200 HP Pro Max / Super Mag | 0G610050-0G856999 |
| 225 HP EFI Pro Max / Super Mag | 0G857000-0T429939 |
| 225 HP EFI Pro Max / Super Mag | 0G610104-0G856999 |
| 200 HP XS 6-Cylinder 2.5L | 1E050852-1E053876 |
Mercury SportJet Engine Fitment
Pro Marine 230 is cross-referenced to crankshaft oil seal applications appearing in Mercury SportJet engine catalog records.
| SportJet Model | Serial Number Range |
|---|---|
| 175XR2 Jet Drive | 0E151580-0E433153 |
| 200 DFI Jet Drive | 1B321662-1B321669 |
| 200 DFI Jet Drive | 0E435742-Present |
| 200 DFI Jet Drive | 0E384500-0E433151 |
| 210 Carb M2 Jet Drive | 0E373939-0E426999 |
| 210 Carb Jet Drive | 0E384500-0E433153 |
| 240 EFI Jet Drive | 0E373939-0E406399 |
| 240 EFI M2 Jet Drive | 0E406400-Present |
Johnson and Evinrude Outboard Applications
Pro Marine 230 is also associated with crankshaft oil seal replacement searches for Johnson and Evinrude outboard engines.
Johnson and Evinrude cross-reference numbers supplied for this seal include:
- 0313992 / 313992
- 0764337 / 764337
- 0777914 / 777914
- 336232
- 508514
- 775423
Specific Johnson and Evinrude horsepower, model-year, and serial-number fitment was not included in the supplied Mercury application charts. Verify the original OEM seal number before ordering Pro Marine 230.
Genuine Mercury 41953-OE Crankshaft Oil Seal
Prefer a factory Mercury replacement? Pro Marine USA also carries Genuine Mercury 41953-OE, the OEM version of this upper and lower crankshaft oil seal.
Both options are available through Pro Marine USA. Select the appropriate version after confirming the original engine part number.
View Genuine Mercury 41953-OE Oil SealWhen Should a Crankshaft Oil Seal Be Replaced?
Crankshaft seals may become worn or damaged due to age, engine operating conditions, or mechanical problems.
Possible indications of a crankshaft sealing problem include:
- Confirmed crankcase air leakage
- Unstable idle
- Hard starting
- Inconsistent engine performance
- Visible seal damage during disassembly
- Crankshaft seal leakage
These conditions may also be caused by fuel-system, ignition, or other engine problems. Diagnose the source before replacing parts.
Installation and Service Recommendations
- Verify the original crankshaft oil seal part number.
- Confirm engine model and serial-number compatibility.
- Identify the required upper or lower crankshaft sealing location.
- Inspect the crankshaft sealing surface before installation.
- Check for crankshaft or bearing problems that may affect seal life.
- Use the correct seal installation tools and procedures.
- Follow the manufacturer's specified seal orientation.
- Inspect related crankcase seals and gaskets during engine service.
- Perform appropriate engine checks after completing repairs.
Some crankshaft seal replacements require extensive engine disassembly. Follow the applicable service manual or consult a qualified marine technician.
Why Choose Pro Marine 230?
- Aftermarket Replacement: An alternative to the Genuine Mercury crankshaft oil seal.
- Multiple OEM References: Cross-referenced to Mercury 41953 and other listed part numbers.
- Wide Application Coverage: Associated with numerous Mercury outboard and SportJet engine families.
- Crankcase Sealing: Helps maintain proper sealing around the crankshaft.
- Engine Repair Applications: Suitable for compatible powerhead rebuilding and crankshaft seal replacement.
- OEM Option Available: Genuine Mercury 41953-OE is sold separately.
- Wholesale Availability: Qualified marine dealers can access Pro Marine dealer pricing.
Frequently Asked Questions
What is Pro Marine part number 230?
Pro Marine 230 is an aftermarket upper and lower crankshaft oil seal for compatible outboard engines. It is cross-referenced to Mercury 41953 and other OEM and aftermarket seal numbers.
Does Pro Marine 230 replace Mercury 41953?
Yes. Mercury 41953 is a primary cross-reference for Pro Marine 230. Confirm the original engine application before ordering.
What is the difference between Pro Marine 230 and Mercury 41953-OE?
Pro Marine 230 is the aftermarket replacement. Mercury 41953-OE is the genuine Mercury OEM version. Both are available from Pro Marine USA.
Does this seal fit Johnson and Evinrude outboards?
The supplied cross-reference list includes numbers associated with Johnson and Evinrude oil seal searches. Verify the original seal number and engine parts diagram before confirming compatibility.
What Mercury horsepower engines use this seal?
The supplied Mercury catalog application records include select 30-125 HP inline outboards, 135-200 HP V6 engines, and certain high-performance models. Exact compatibility depends on the engine model and serial-number range.
Does Pro Marine 230 fit Mercury SportJet engines?
The supplied application data includes select Mercury SportJet 175, 200, 210, and 240 HP engine families. Verify the required seal location and original part number.
Is this an upper or lower crankshaft oil seal?
Pro Marine 230 is listed for upper and lower crankshaft oil seal applications. The correct location depends on the engine design.
Can a leaking crankshaft seal cause engine performance problems?
Yes. On a two-stroke engine, a crankshaft seal leak can interfere with crankcase pressure and contribute to poor idle, difficult starting, or inconsistent operation.
How do I know if Pro Marine 230 fits my engine?
Locate your engine model and serial number, then verify the original crankshaft oil seal using the manufacturer's parts diagram. Match that part number to the cross-reference list.
Dealer Discounts & Store Policies
Wholesale Marine Parts Pricing
Pro Marine USA supplies aftermarket and genuine OEM marine engine parts to professional marine technicians, repair facilities, boat dealers, and retail customers.
Qualified marine businesses can apply for a Pro Marine dealer account to access wholesale pricing on eligible products.
Shipping Information
- Free shipping on orders over $100 within the continental United States.
- Orders received before 5:30 PM EST ship the same business day, Monday-Friday.
- Shipping available through UPS, USPS, and FedEx.
- Typical delivery time is 1-5 business days.
Returns
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required.
Need help identifying the correct crankshaft oil seal? Contact Pro Marine USA or call 941-721-3000.
Searchable Part Numbers
230, 41953, 41953B, 41953-OE, 0313992, 0764337, 0777914, 18-2016, 20079, 25837, 29476, 313992, 336232, 508514, 764337, 775423, 777914, 9-76100
Searchable Terms
Pro Marine 230 crankshaft oil seal, Pro Marine aftermarket crank seal, Mercury 41953 replacement, Mercury upper crankshaft oil seal, Mercury lower crankshaft oil seal, Johnson crankshaft seal, Evinrude crankshaft seal, Johnson Evinrude oil seal, Mercury Mariner crankshaft seal, Mercury 2 stroke oil seal, Mercury 150 HP crankshaft seal, Mercury 175 HP crankshaft seal, Mercury 200 HP crankshaft seal, Mercury V6 crankshaft seal, Mercury 2.5L crankshaft seal, Mercury SportJet crankshaft seal, outboard powerhead crankshaft seal, outboard engine crankcase oil seal, aftermarket outboard crankshaft seal
0764337
0777914
18-2016
20079
25837
29476
313992
336232
41953
41953B
508514
764337
775423
777914
9-76100
62384
64067
80330
823683
855430A1