Mercury MerCruiser Quicksilver Sea Water Pump Seal 26-806930
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Mercury MerCruiser Quicksilver Sea Water Pump Seal 26-806930
Part Number: 26-806930 (short ref: 806930)
Brand: Mercury / Quicksilver
Product Type: Sea Water Pump Seal (OEM)
System: MerCruiser Raw-Water / Sea Water Cooling
Application: Sea water pump with integral fuel pump assembly
Quantity Required: Confirm by pump assembly diagram
Approximate Weight: 50 g
What This Part Does
The 26-806930 is a genuine OEM seal used in selected MerCruiser sterndrive sea water pump assemblies that incorporate an integral fuel pump. It seals the pump assembly during raw-water cooling system service, helping prevent coolant leakage and maintain pump performance. This seal is specifically associated with the 1994–1997 sea water pump with fuel pump configuration — not a universal MerCruiser water pump seal.
Compatible Applications
Confirm your engine model, serial number, and sea water pump assembly diagram before ordering. MerCruiser pump designs vary by engine family, model year, and pump configuration.
- MerCruiser sterndrive engines equipped with the 1994–1997 sea water pump with integral fuel pump assembly, where 26-806930 is called out in the parts diagram
This seal is specific to the sea pump with fuel pump configuration. Do not order for standard sea water pump assemblies without the fuel pump component — confirm by the exact pump assembly part number and serial number.
Serial Number Notice
MerCruiser sea water pump designs changed across model years and engine families. Confirm part number 26-806930 against your exact engine serial number and the applicable sea water pump assembly diagram before ordering. The key fitment detail is the sea pump with integral fuel pump design — separate pump configurations use different seals.
When to Replace
- Sea water pump is leaking around the seal area
- Seal is worn, hardened, cracked, or distorted on inspection
- Seal was disturbed or damaged during pump disassembly
- Sea water pump rebuild or service requires seal replacement per the Mercury service procedure
Installation Notes
- Clean the pump housing and shaft sealing surfaces before installation — remove all old seal material without scoring the mating surfaces
- While the pump is apart, inspect the impeller, wear plate, pump housing, and all adjacent seals
- Do not reuse a removed seal — a seal that appeared intact on the bench often leaks once back under pressure
- Follow the Mercury MerCruiser service manual procedure for sea water pump disassembly and reassembly
- Check for leaks after the engine reaches operating temperature and the cooling system is under pressure
Part Number Cross-Reference
- OEM Part Number: 26-806930
- Short Reference: 806930
Related Parts
Parts Desk Insights
Best use case: Order 26-806930 when servicing the sea water pump on a 1994–1997 MerCruiser sterndrive that uses the combined sea pump and fuel pump assembly, and the pump is coming apart for a seal replacement, impeller service, or leak diagnosis. Replace the seal as a matter of course any time the pump is disassembled — the part is low cost and reusing a compressed seal risks a return leak.
Common issues: The most frequent mistake is ordering a generic MerCruiser water pump seal without confirming the specific sea pump with fuel pump configuration. MerCruiser used different pump designs across engine families and model years, and the seals are not interchangeable between configurations. Always confirm by the exact pump assembly diagram for your engine serial number before ordering.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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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.
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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:
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