Mercury MerCruiser Quicksilver Water Pump Cover Gasket 43033
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Mercury MerCruiser Quicksilver 27-43033 is a water pump gasket used at the cover-to-face-plate area in select Mercury, Mariner, and MerCruiser lower-unit water pump assemblies. Mercury parts references show the original 27-43033 / 43033 superseding to the current functional replacement 27-430331 / 430331, identified as a fiber gasket.
Key Features
- Genuine Mercury Marine / Quicksilver-style water pump gasket reference
- Used in the water pump cover / face plate sealing area
- Helps maintain proper sealing during impeller and water pump service
- Original Mercury reference: 27-43033 / 43033
- Current replacement reference: 27-430331 / 430331
- GTIN for current reference: 745061149649
- Catalog shipping reference: approximately 0.03 lb, 7.50 in. x 5.25 in. x 0.25 in. for 27-430331
Engine Compatibility
This gasket is shown in Mercury parts references across a broad range of select Mercury and Mariner outboard water pump applications, including many 45 Jet, 50, 55, 60, 65 Jet, 70, 75, 80, 90, 100, 115, 125, 135–300 HP, Verado, DFI, EFI, and 4-stroke model families depending on serial number. It is also listed in MerCruiser Alpha One Gen II applications, including 1991–1995, 1996–1997, and 1998-and-up serial ranges.
Serial Number Fitment Notice
Water pump gasket fitment varies by engine model, drive model, gear housing, water pump plate arrangement, and serial number range. Always confirm compatibility using the Mercury or MerCruiser serial number before ordering, especially where older 27-43033 has been replaced by 27-430331.
When This Part Needs Replacement
Replace this gasket whenever the water pump cover, face plate, or impeller assembly is serviced. A compressed, torn, hardened, or misaligned gasket can cause poor sealing, reduced pump efficiency, water leakage inside the pump stack, or repeat lower-unit service.
Installation Notes
Clean the water pump cover and face plate surfaces before installation. Remove all old gasket material without scratching the mating surfaces, inspect the face plate and water pump housing for scoring, and install the gasket in the correct orientation. For best results, replace related water pump wear parts at the same time if they show grooves, corrosion, or heat damage.
Alternate / Superseded Part Numbers
- 27-43033
- 43033
- 27-430331
- 430331
- 27-43033-1
- Sierra 18-2564 — related aftermarket interchange reference
- AM27-430331 — related aftermarket interchange reference
- Honda 19234-ZW1-003 — related interchange reference
- OMC / Johnson / Evinrude 0509257 — related interchange reference
Parts Desk Insight
This gasket is commonly ordered during impeller service, but the important detail is matching the complete water pump stack by serial number. Older 43033 references now point to 430331, and the replacement may not look identical while still serving the same sealing function.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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