Water Pump Base Gasket – Fits Mercury/Mariner 6-15 HP Outboards (Replaces 27-192043, 192042)
Water Pump Base Gasket – Fits Mercury/Mariner 6-15 HP Outboards (Replaces 27-192043, 192042) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Base Gasket – Fits Mercury/Mariner 6-15 HP Outboards (Re...
Product Details
Ensure a perfect seal with our Water Pump Base Gasket – Fits Mercury/Mariner 6-15 HP Outboards, designed for a wide range of 2-stroke and 4-stroke engines from the 1980s through the 2000s. This essential component fits various models including the Marathon, Sea Pro, Viking, XR10, and Magnum series, preventing leaks between the water pump base and lower gear housing.
This gasket is a direct interchange for Mercury part numbers 27-192043 and 27-192042, Quicksilver 27-192043, and Sierra 18-0995.
- Installs between the water pump base and lower gearcase housing.
- Crucial for preventing water and pressure leaks for optimal cooling performance.
- Engineered from durable composite materials for a reliable, long-lasting seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Supersedes |
|---|---|---|
| Mercury | 27-192043 | 27-192042 |
| Quicksilver | 27-192043 | |
| Sierra | 18-0995 |
Engine & Model Compatibility
Confirm your engine model and year or serial number range in the table below.
This gasket fits a broad range of portable Mercury and Mariner outboards from 6 HP to 15 HP, including 2-stroke and 4-stroke variants.
It also fits select Force, Sears, and Mercury-branded accessory kits that utilize the same gearcase and water pump design.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 6 | 6 | 2-Stroke | 0G760300–0T800999 | 27-192043 | |
| Mercury | 6 | 6 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 6 | 6 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | 8 | 8 | 2-Stroke | 0G760300–0T979999 | 27-192043 | |
| Mercury | 8 | 8 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 8 | 8 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | 8 | 8 | 2-Stroke | 0T980000–0T999999 | 27-192043 | |
| Mercury | 8 | 8 | 2-Stroke | 1B000001 & Up | 27-192043 | |
| Mercury | 8 BODENSEE | 8 | 4-Stroke | 0P086824–0P400999 | 27-192043 | International model |
| Mercury | 9.9 | 9.9 | 2-Stroke | 0G760300–0T979999 | 27-192043 | |
| Mercury | 9.9 | 9.9 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 9.9 | 9.9 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | 9.9 | 9.9 | 2-Stroke | 0T980000–0T999999 | 27-192043 | |
| Mercury | 9.9 | 9.9 | 2-Stroke | 1B000001 & Up | 27-192043 | |
| Mercury | 9.9 (4-STROKE) | 9.9 | 4-Stroke | 0G760300–1B226999 | 27-192043 | 323 cc |
| Mercury | 9.9 (4-STROKE) | 9.9 | 4-Stroke | 0P075166–0P400999 | 27-192043 | 323 cc |
| Mercury | 10 MAGNUM | 10 | 2-Stroke | 0G760300–0T979999 | 27-192043 | |
| Mercury | 10 MAGNUM | 10 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 10 MARATHON | 10 | 2-Stroke | 0G760300–0T979999 | 27-192043 | |
| Mercury | 10 MARATHON | 10 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 10 MARATHON | 10 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | 10 MARATHON | 10 | 2-Stroke | 0T980000–0T999999 | 27-192043 | |
| Mercury | 10 MARATHON | 10 | 2-Stroke | 1B000001 & Up | 27-192043 | |
| Mercury | 10 SEA PRO | 10 | 2-Stroke | 0G760300–0T979999 | 27-192043 | |
| Mercury | 10 SEA PRO | 10 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 10 SEA PRO | 10 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | 10 SEA PRO | 10 | 2-Stroke | 0T980000–0T999999 | 27-192043 | |
| Mercury | 10 SEA PRO | 10 | 2-Stroke | 1B000001 & Up | 27-192043 | |
| Mercury | 10 VIKING | 10 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 10 VIKING | 10 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | 13.5 (4-STROKE) | 13.5 | 4-Stroke | 0P134638–0P400999 | 27-192043 | International model |
| Mercury | 13.5 (4-STROKE) | 13.5 | 4-Stroke | 0P401000 & Up | 27-192043 | International model |
| Mercury | 15 | 15 | 2-Stroke | 0G760300–0T979999 | 27-192043 | |
| Mercury | 15 | 15 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 15 | 15 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | 15 | 15 | 2-Stroke | 0T980000–0T999999 | 27-192043 | |
| Mercury | 15 | 15 | 2-Stroke | 1B000001 & Up | 27-192043 | |
| Mercury | 15 (4-STROKE) | 15 | 4-Stroke | 0G760300–1B226999 | 27-192043 | |
| Mercury | 15 (4-STROKE) | 15 | 4-Stroke | 0P075166–0P400999 | 27-192043 | |
| Mercury | 15 (4-STROKE) | 15 | 4-Stroke | 0P401000 & Up | 27-192043 | |
| Mercury | 15 (4-STROKE) | 15 | 4-Stroke | 1B227000–1B727495 | 27-192043 | |
| Mercury | 15 MARATHON | 15 | 2-Stroke | 0G760300–0T979999 | 27-192043 | |
| Mercury | 15 MARATHON | 15 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 15 MARATHON | 15 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | 15 MARATHON | 15 | 2-Stroke | 0T980000–0T999999 | 27-192043 | |
| Mercury | 15 MARATHON | 15 | 2-Stroke | 1B000001 & Up | 27-192043 | |
| Mercury | 15 SEA PRO | 15 | 2-Stroke | 0G760300–0T979999 | 27-192043 | |
| Mercury | 15 SEA PRO | 15 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Mercury | 15 SEA PRO | 15 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | 15 SEA PRO | 15 | 2-Stroke | 0T980000–0T999999 | 27-192043 | |
| Mercury | 15 SEA PRO | 15 | 2-Stroke | 1B000001 & Up | 27-192043 | |
| Mercury | 15 VIKING | 15 | 2-Stroke | 0P325500 & Up | 27-192043 | |
| Mercury | XR10 | 10 | 2-Stroke | 0G760300–0T979999 | 27-192043 | |
| Mercury | XR10 | 10 | 2-Stroke | 0P017000–0P325499 | 27-192043 | |
| Force | 9.9 H.P. | 9.9 | 2-Stroke | 1998 | 27-192043 | |
| Force | 15 H.P. | 15 | 2-Stroke | 1998 | 27-192043 | |
| Sears | 9.9 H.P. | 9.9 | 2-Stroke | 1998 | 27-192043 | W/6.6 GALLON REMOTE TANK |
| Sears | 15 H.P. | 15 | 2-Stroke | 1998 | 27-192043 | W/6.6 GALLON REMOTE TANK |
| Mercury | Extension Kit | N/A | N/A | 1994 & Up | 27-192043 | Extension Kit-Driveshaft Housing (828032A1/A2) |
Technical Specs
- Product Type
- Water Pump Base Gasket
- Installation Location
- Between water pump base and lower gear housing
- Housing Material
- Gasket material (likely paper or composite)
- Dimensions
- 7.5" x 6.0" x 0.13"
- Weight
- 0.004 kg (0.009 lb)
- GTIN
- 745061489080
What’s in the Box
- 1 x Gasket (Replaces 27-192043)
Installation Notes
Installation is recommended for individuals with mechanical experience. The process involves draining the gear oil, detaching the lower unit, removing the water pump housing and base to access the old gasket, thoroughly cleaning all mating surfaces of any residue, and then installing the new gasket before reassembly. Always consult your engine's service manual and torque bolts to the manufacturer's specified values to ensure a proper seal.
Troubleshooting & FAQ
How can I confirm this gasket is correct for my outboard?
The most reliable method is to match the OEM part number (27-192043 or 27-192042) from your engine's service manual. You can also use the detailed compatibility table on this page to find your specific engine model, HP, and serial number range.
What are symptoms of a bad water pump base gasket?
A failed base gasket can cause a vacuum leak or a water leak. This may lead to engine overheating, a weak water stream from the tell-tale indicator, or visible water dripping from the gearcase seam where the water pump is located.
When should I replace my water pump gasket?
It is best practice to replace this gasket every time you service your water pump impeller, which is typically recommended every 1–2 years or 100-200 hours of use, especially when operating in saltwater or sandy/silty conditions.
Can I reuse my old gasket?
No. Gaskets are designed as single-use components that compress to create a seal. Once removed, an old gasket will not provide a reliable seal and is highly likely to cause leaks, leading to potential engine damage from overheating. Always use a new gasket during service.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch-inspections for consistency and quality.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
This part is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window for unused items in original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears on the compatibility list—do not order.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is highly recommended for safety and to ensure optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
Payment & Security
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