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3KY-01030-0 Maintenance Kit for Tohatsu MFS40 MFS50A | JLM Marine
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3KY-01030-0 Maintenance Kit for Tohatsu MFS40 MFS50A | JLM Marine
This comprehensive maintenance kit is specifically designed for Tohatsu MFS40 and MFS50A outboard engines. It provides all essential service components in one convenient package to ensure your engine runs smoothly and reliably season after season.
This kit directly replaces OEM part number 3KY-01030-0, delivering a complete solution for routine maintenance without the need to source individual components separately.
- Includes water pump repair kit, thermostat, fuel filter, gaskets, and gear oil pump
- Designed for MFS40/50A models
- All components meet OEM specifications for reliable performance
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Tohatsu | 3KY-01030-0 | OEM Maintenance Kit |
Compatible Engine Models
Confirm your engine model/year in the table below.
| Brand | Model | Notes |
|---|---|---|
| Tohatsu | MFS40 | Four-stroke outboard |
| Tohatsu | MFS50A | Four-stroke outboard |
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 3KY-01030-0 |
| Application | Tohatsu MFS40/50A |
| Kit Type | Comprehensive Maintenance Kit |
Package Contents
This maintenance kit includes the following components:
- 3T5-87322-3 Water Pump Repair Kit × 1
- 3H6-01030-0 Thermostat × 1
- 346-02230-0 Fuel Filter × 1
- 3R3-07406-0 Gasket × 1
- 332-60006 Drain Gasket × 2
- 24OP149 Gear Oil Pump × 1
Installation Guide
- Preparation: Ensure the engine is off and cooled down completely. Gather necessary tools including wrenches, screwdrivers, and a drain pan.
- Drain fluids: Use the included gear oil pump to drain the lower unit gear oil. Collect old fuel and coolant as needed per your service manual.
- Remove water pump housing: Unbolt the lower unit and carefully separate the water pump housing. Remove the old impeller and components.
- Install water pump repair kit: Clean all mating surfaces thoroughly. Install new impeller, gaskets, and seals from the water pump repair kit per factory specifications.
- Replace thermostat: Locate the thermostat housing on the cylinder head. Remove the old thermostat and install the new one with fresh gasket.
- Replace fuel filter: Disconnect fuel lines and remove the old fuel filter. Install the new fuel filter ensuring proper flow direction.
- Install gaskets: Replace all gaskets at their respective locations during reassembly.
- Reassemble components: Reinstall the water pump housing and lower unit, torquing all fasteners to manufacturer specifications.
- Refill fluids: Use the gear oil pump to refill the lower unit with fresh gear oil until it flows from the upper vent hole. Replace coolant and fuel as needed.
- System check: Reconnect all hoses and lines securely. Inspect for any leaks or loose connections before starting the engine.
- Test run: Start the engine and allow it to reach operating temperature. Check for proper water pump discharge and verify no leaks.
- Final inspection: Recheck all fasteners and connections after the test run. Dispose of old fluids and parts properly according to local regulations.
Troubleshooting & FAQ
Q: How do I confirm this maintenance kit fits my Tohatsu engine?
A: Verify your engine model is MFS40 or MFS50A by checking the serial number plate on the mounting bracket. Cross-reference the OEM part number 3KY-01030-0 in your engine's service manual to ensure compatibility.
Q: How often should I perform this maintenance service?
A: Tohatsu recommends annual maintenance or every 100 hours of operation, whichever comes first. In harsh conditions (saltwater, heavy use), more frequent service intervals may be necessary.
Q: Can I install this kit myself or do I need a professional?
A: If you have mechanical experience and the proper tools, you can install this kit following your engine's service manual. However, professional installation is recommended to ensure proper torque specifications and system integrity.
Q: What are the signs that I need to replace these maintenance items?
A: Common warning signs include overheating, weak water pump discharge, rough idling, fuel starvation, or visible gear oil leaks. Regular preventive maintenance prevents these issues from occurring.
Q: Does this kit include the gear oil itself?
A: No, this kit includes the gear oil pump for draining and refilling, but the gear oil itself must be purchased separately. Refer to your owner's manual for the correct oil type and capacity.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
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