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Outboard Motor Parts | OEM & Aftermarket
Shop OEM and aftermarket outboard motor parts for Mercury, Yamaha, Suzuki, Honda, Johnson / Evinrude / E-TEC, Tohatsu / Nissan, and Chrysler / Force engines. Pro Marine USA carries parts for routine maintenance, troubleshooting, repair, and complete marine engine rebuilds.
Browse by outboard manufacturer or engine system, or use our OEM parts lookup to identify the correct part number before ordering. Find cooling, fuel, ignition, electrical, internal engine, lower unit, steering, trim, service kit, gasket, seal, and rebuild parts in one place.
Shop Outboard Parts by Manufacturer
Chrysler / Force Outboard Parts for Chrysler and Force outboard repair 
Honda Outboard Honda cooling, fuel, electrical, and engine parts 
Johnson / Evinrude / E-TEC Outboard Johnson, Evinrude, E-TEC, and OMC replacement parts 
Mercury Outboard Mercury and Mariner maintenance, repair, and rebuild parts 
Suzuki Outboard Suzuki service, lower unit, fuel, and engine parts 
Tohatsu / Nissan Outboard Tohatsu and Nissan outboard replacement parts 
Yamaha Outboard Yamaha maintenance, repair, lower unit, and rebuild parts Find the Correct Outboard Part
Not sure which part fits your engine? Start with the engine manufacturer, horsepower, model number, serial number, and year whenever available.
Our OEM parts lookup lets you view factory parts diagrams and identify the original part number for many popular outboard engines. Once you have the OEM number, search Pro Marine to find available OEM and aftermarket replacement options.
Use Our OEM Parts Lookup »Shop Outboard Parts by Engine System
Outboard engines use several interconnected systems. Select your manufacturer above to browse the exact categories available for your engine, including the following common repair and maintenance areas.
Common Outboard Problems and Where to Start
- Engine overheating: inspect the water pump, impeller, thermostat, pressure-control components, cooling passages, and engine anodes.
- Hard starting or rough idle: check fuel delivery, carburetor or injector operation, spark plugs, ignition components, filters, and intake sealing.
- Weak spark or no spark: test ignition coils, stators, switch boxes or ignition modules, sensors, wiring, grounds, and related electrical components.
- Low compression or poor power: inspect pistons, rings, cylinder condition, head and powerhead gaskets, bearings, and other internal engine components.
- Milky gear lube: inspect prop shaft, driveshaft, shift shaft, bearing carrier, and other lower unit seals for water intrusion.
- Lower unit or gearcase noise: inspect bearings, gears, clutch components, shafts, and gear lube condition before continued operation.
- Trim or steering problems: inspect hydraulic fluid level, seals, hoses, trim motors, pumps, steering cylinders, and mechanical connections.
Why Buy Outboard Parts from Pro Marine USA?
- OEM and aftermarket replacement options for major outboard engine brands.
- Marine engine parts for routine maintenance, professional repair, and complete rebuild projects.
- OEM diagram and part-number lookup tools to help identify the correct component before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large selection of service kits, engine parts, lower unit components, fuel system parts, electrical parts, steering, and rigging products.
- Same-day weekday shipping available on qualifying in-stock orders placed before the shipping cutoff.
OEM and Aftermarket Outboard Parts
OEM parts are supplied by the original engine manufacturer and are designed for the specific engine application. Aftermarket parts are replacement components produced by independent marine parts manufacturers and may provide additional availability or value for many common repairs.
Pro Marine carries both genuine OEM parts and quality aftermarket replacement parts for many outboard maintenance, repair, and rebuild applications. Always confirm fitment using the engine model, serial number, horsepower, year range, or OEM part number when available.
Frequently Asked Questions
How do I find the correct parts for my outboard motor?
Start by identifying the engine manufacturer, horsepower, model number, serial number, and year. Select the manufacturer above to browse by engine system, or use the OEM parts lookup to locate the original part number from a factory diagram.
Can I search Pro Marine by OEM part number?
Yes. If you already have the OEM part number, enter it 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.
What information should I have before ordering an outboard part?
Have the engine manufacturer, horsepower, model number, serial number, and year whenever possible. An OEM part number from the original component or parts diagram is especially helpful because visually similar parts may fit different engine families.
What is the difference between OEM and aftermarket outboard parts?
OEM parts come from the original engine manufacturer. Aftermarket parts are replacement components manufactured by other marine parts companies for compatible applications. Pro Marine carries both OEM and aftermarket options across many common outboard engine systems.
Are aftermarket outboard motor parts reliable?
Quality aftermarket marine parts are commonly used for maintenance, professional repair, and engine rebuilding. The best option depends on the application, manufacturer, availability, and customer preference.
Do you carry parts for older outboard motors?
Yes. Pro Marine carries parts for many older Mercury, Mariner, Johnson, Evinrude, Chrysler, Force, Yamaha, Honda, Suzuki, Nissan, and Tohatsu outboards. Availability varies by engine family and component.
What outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump impellers, complete water pump kits, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Outboard parts can vary by model, serial range, horsepower, and production year. Confirm the OEM part number or engine identification information whenever possible before ordering.
Sierra Replacement Mercury Outboard Control Module
Mercury V135, V140, V150, V200, XR-6 & 140 Jet Control Module - Sierra 18-99253
The Sierra 18-99253 Control Module is an aftermarket replacement for select Mercury outboard engines using Mercury 857185T1 and related control module applications.
Verified fitment includes select V-135, V-140, V-150, V-200, XR-6 / Magnum III and 140 Jet Mercury outboards.
The original Mercury OEM version of this module is no longer available. Sierra 18-99253 is the available replacement option for these applications.
Mercury has discontinued the original OEM control module used in these applications.
The Sierra 18-99253 is the available replacement for compatible engines that originally used Mercury 857185T1.
OEM & Cross Reference Numbers
| Brand / Type | Part Number |
|---|---|
| Sierra | 18-99253 |
| Cross Reference | 144-7185 |
| Mercury OEM | 857185T1 |
Mercury Outboard Fitment
| Mercury Engine | Serial Number Range |
|---|---|
| V-135 | 0G960500 thru 0T178499 |
| 140 Jet | 0G960500 thru 0T178499 |
| V-140 International | 0T178500 thru 1B226999 |
| V-150 | 0G960500 thru 1B226999 |
| XR-6 / Magnum III | 0G960500 thru 1B226999 |
| V-200 | 0G960500 thru 1B226999 |
Mercury used different electrical components across similar horsepower ranges. Do not order this control module by horsepower alone.
Verify the complete engine serial number and confirm the original module cross references 857185T1 or 144-7185 before ordering.
What This Control Module Does
The control module is part of the engine's electronic control system and helps manage the electrical functions assigned to the module within the Mercury outboard ignition / engine management system.
A failed control module can result in ignition or engine-running issues depending on the exact engine configuration and failure mode.
Common Reasons for Replacement
- Original Mercury module has failed
- Intermittent ignition or engine electrical problem
- Module has visible heat or electrical damage
- Diagnostic testing identifies the module as faulty
- Original Mercury 857185T1 is no longer available
Before Replacing the Module
Electronic control modules should not be replaced solely based on symptoms. Verify related wiring, grounds, connectors, stator / trigger components, charging voltage and other ignition-system components as applicable to the engine.
Follow Mercury service procedures for the exact engine and serial number before condemning the module.
Why Use Sierra 18-99253?
- Sierra aftermarket replacement control module
- Replaces discontinued Mercury OEM 857185T1
- Cross references 144-7185
- Fits select Mercury V-135 outboards
- Fits select Mercury V-140 International outboards
- Fits select Mercury V-150 outboards
- Fits select Mercury V-200 outboards
- Fits select Mercury XR-6 / Magnum III engines
- Fits select Mercury 140 Jet applications
- Available replacement now that the OEM module is discontinued
FAQ
Is Sierra 18-99253 an OEM Mercury part?
No. This is a Sierra aftermarket replacement.
What Mercury part number does 18-99253 replace?
It replaces Mercury 857185T1 and cross references
144-7185.
Is the original Mercury control module still available?
No. The Mercury OEM version is no longer available.
Sierra 18-99253 is the available replacement for compatible applications.
Does it fit Mercury V-150?
Yes. Verified fitment includes V-150 engines from
0G960500 thru 1B226999.
Does it fit Mercury XR-6?
Yes. Verified XR-6 / Magnum III fitment includes serial
0G960500 thru 1B226999.
Does it fit Mercury V-200?
Yes. Verified V-200 applications include serial
0G960500 thru 1B226999.
Does it fit Mercury V-135?
Yes. Verified V-135 fitment is
0G960500 thru 0T178499.
Does it fit a Mercury 140 Jet?
Yes. Verified 140 Jet applications are
0G960500 thru 0T178499.
Should I verify my serial number before ordering?
Yes. Mercury used different electrical components across similar engine
families, so the serial number should always be verified.
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 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 electrical parts are not returnable.
- Return authorization is required before sending items back.
Need help verifying fitment?
Contact Pro Marine
Phone: 941-721-3000
Searchable Terms
18-99253, Sierra 18-99253, 144-7185, 857185T1, Mercury 857185T1, Mercury control module, Mercury ignition control module, Mercury V135 control module, Mercury V140 control module, Mercury V150 control module, Mercury V200 control module, Mercury XR6 control module, Mercury XR-6 module, Mercury Magnum III module, Mercury 140 Jet control module, discontinued Mercury control module, Mercury 857185 replacement, Sierra Mercury control module, 0G960500, 0T178499, 0T178500, 1B226999
857185T1
6E5-43872-00-00
6H1-43871-00-00
6H1-43871-10-00
61A-43871-00-00
65W-43871-00-00
17400-92J22
17400-92J23
8M6012812
92J21P
6E9-W0093-01-00
6E9-W0093-02-00
9-37519
11499T
18-7388
6G1-24411-00-00
63V-24411-00-00
6E0-24411-00-00
6E0-24471-00-00
91753M
11499M
11499T
18-7367
6G1-24411-00-00
6G1-24471-00-00
