Mercury MerCruiser Driveshaft Housing Water Seal - 36557
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The Mercury MerCruiser Quicksilver driveshaft housing water seal is a genuine Mercury Marine OEM sealing component used on select vintage Mercury outboards and early MerCruiser sterndrive assemblies. This seal is used where the factory parts diagram calls for the exact seal number in the driveshaft housing, lower unit, bottom cowl, or water-passage area. It helps maintain proper cooling-water routing through the housing connection and should be replaced whenever the related sealing joint is opened or the original seal is hardened, cracked, flattened, or leaking.
Key Features
- Genuine Mercury Marine factory OEM sealing component.
- Used in select vintage Mercury outboard and MerCruiser sterndrive cooling-water passage locations.
- Commonly associated with driveshaft housing, lower-unit, bottom-cowl, and water-transfer sealing points.
- Helps seal cooling-water pathways between connected housings.
- Important during water pump, impeller, lower-unit, or driveshaft housing service.
- Should be matched by exact Mercury part number and factory diagram location before ordering.
Application Compatibility
Common where-used application groups include select Mercury and MerCruiser models by serial number and diagram location, including:
- Mercury 65 HP outboards, serial range 1765044 through 2119748, where specified
- Mercury 90 HP outboards, serial range 1766824 through 1869775, where specified
- Mercury 100 HP and 110 HP outboards, serial range 1768404 through 2318585, where specified
- MerCruiser 120 / 140 / 165 sterndrive applications where specified
- MerCruiser 470 / 485 applications where specified
- MerCruiser 225-S / 228 / 233 / 250 / 260 / 888 / 898 applications where specified
- MerCruiser Model 60 Renault 68 applications where specified
Use this seal only where the Mercury/MerCruiser parts diagram specifically calls for the exact part number.
Serial Number Fitment Notice
Confirm fitment by engine or drive serial number, housing style, cooling-water passage layout, and exact Mercury/MerCruiser parts diagram before ordering. Early Mercury outboards and MerCruiser sterndrives used many similar-looking seals across driveshaft housings, lower units, water pump areas, and transom-related passages, so model family alone is not enough to confirm fitment.
When This Part Needs Replacement
Replace this seal if there is visible water leakage at the driveshaft housing connection, cooling-water leakage near the lower unit, a damaged or flattened old seal, or if the seal is disturbed during impeller, water pump, lower-unit, or driveshaft housing service. Old rubber seals often lose compression and may not reseal properly after disassembly.
Installation Notes
Clean both mating surfaces before installing the new seal. Remove old rubber, salt buildup, corrosion residue, grease, and debris without gouging the housing surfaces. Inspect the water tube, water pump housing, driveshaft housing, lower-unit mating face, fasteners, and related gaskets while the assembly is apart. Install the seal in the exact orientation shown in the Mercury/MerCruiser service diagram and follow the correct tightening sequence for the specific model.
Alternate/Superseded Part Numbers
- Exact Mercury/MerCruiser part number needed before publishing
- Verify any older, superseded, or replacement numbers by serial number and factory diagram before substitution.
Parts Desk Insight
Cooling-water seals in vintage outboards and early MerCruiser drives should be replaced when the joint is opened, even if the old seal looks usable. A compressed or hardened seal can allow cooling water to escape at the housing connection, which may reduce water delivery and create repeat teardown work after the unit is reassembled.
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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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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