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Description
Water Pump Impeller Maintenance Kit – Fits Mercury/Mariner/Tohatsu 4/5/6 HP 4-Stroke (Replaces 8M0120836, 3GR-87500-0)Water Pump Impeller Maintenance Kit Fits Mercury Mariner Tohatsu 4 5 6 HP 4 Stroke This water pump impeller maintenance kit is designed for Mercury Mariner 4 6 HP 4 Stroke outboard engines (serial numbers 0R411838 and above) and compatible Tohatsu 4 6 HP 4 Stroke models. It contains essential components for cooling system service to maintain engine performance and prevent overheating. This kit is a direct replacement for Mercury part number 8M0120836
Water Pump Impeller Maintenance Kit – Fits Mercury/Mariner/Tohatsu 4/5/6 HP 4-Stroke
This water pump impeller maintenance kit is designed for Mercury/Mariner 4-6 HP 4-Stroke outboard engines (serial numbers 0R411838 and above) and compatible Tohatsu 4-6 HP 4-Stroke models. It contains essential components for cooling system service to maintain engine performance and prevent overheating.
This kit is a direct replacement for Mercury part number 8M0120836 and Tohatsu part number 3GR-87500-0.
- Installation Type: Direct replacement
- Fuel Compatibility: Gasoline
- Primary Function: For cooling system maintenance and general service
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
Confirm your engine model/year in the table below.
Mercury/Mariner
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 4 HP EFI | 4 | 4-Stroke | 2015 and up | 8M0120836 | Serial number 0R411838 and above |
| Mercury | 5 HP EFI | 5 | 4-Stroke | 2015 and up | 8M0120836 | Serial number 0R411838 and above |
| Mercury | 6 HP EFI | 6 | 4-Stroke | 2015 and up | 8M0120836 | Serial number 0R411838 and above |
Tohatsu
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Tohatsu | MFS4 | 4 | 4-Stroke | 3GR-87500-0 | Compatible with kit |
| Tohatsu | MFS5 | 5 | 4-Stroke | 3GR-87500-0 | Compatible with kit |
| Tohatsu | MFS6 | 6 | 4-Stroke | 3GR-87500-0 | Compatible with kit |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Outboard Maintenance Service Kit |
| Installation | Direct replacement |
| Fuel Type | Gasoline |
| Housing Material | Various components |
| Dimensions | Packaging dimensions approximately 100 × 92 × 76 mm (3.88 × 3.63 × 3.00 in) |
| Weight | 0.21 kg (0.46 lb) |
| Other Technical Attributes | For cooling system maintenance and general service |
Package Contents
- 1 x Water Pump Impeller (47-16154-3)
- 1 x Cotter Pin (8150264)
- 1 x Pin Key (28-16155)
- 1 x Thermostat (804540)
- 1 x Thermostat Gasket (27-8M0214960)
- 1 x O-Ring (25-16131)
- 1 x Oil Seal (26-16130)
- 1 x Fuel Filter (35-8M0157133)
- 1 x Gaskets (8035161)
- 2 x Drain Gasket (27-95220)
Installation Guide
- Disconnect the engine's battery and remove the spark plug wire(s) to prevent accidental starting.
- Access the lower unit by disconnecting any shift linkage and removing the bolts securing the lower unit to the midsection.
- Remove the lower unit carefully from the outboard's main housing.
- Locate and open the water pump housing on top of the gearcase by removing the retaining bolts.
- Remove the old impeller and associated components, noting their orientation.
- Clean the pump housing thoroughly before installing new components.
- Install the new impeller with a slight twisting motion in the correct rotational direction.
- Reassemble the pump housing with new gaskets and seals from the kit.
- Reattach the lower unit, aligning the driveshaft and water tube properly.
- Reconnect the battery and test the engine with water supply to confirm proper cooling system function.
Troubleshooting & FAQ
Q: How do I confirm this fits my Mercury/Mariner engine?
A: This kit fits Mercury and Mariner 4, 5, and 6 HP EFI 4-stroke outboards from 2015 and newer with a serial number of 0R411838 and above. Please verify your serial number before ordering.
Q: How do I know if my Tohatsu engine is compatible?
A: This kit is compatible with Tohatsu MFS4, MFS5, and MFS6 4-stroke models that use the OEM part number 3GR-87500-0. We recommend checking your engine's service manual or original parts to confirm.
Q: How often should I perform this service?
A: This kit is designed for comprehensive cooling system maintenance. For Mercury engines, it aligns with components needed for the 300-hour service interval. Refer to your engine's service manual for specific maintenance schedules.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy