Description

he Mercury MerCruiser Quicksilver 37641001 is a genuine Mercury Marine OEM exhaust tube seal used on select vintage Mercury outboard and MerCruiser sterndrive exhaust housing assemblies. This seal replaces the earlier 26-37641 / 37641 reference and is used where the factory parts diagram calls for this seal at the exhaust tube, exhaust housing pocket, driveshaft housing, or lower-unit interface. It helps seal the exhaust and cooling-water passage area so gases and water remain routed through the intended housing channels.

Key Features

• Genuine Mercury Marine factory OEM exhaust tube seal.
• Current Mercury service part number: 37641001.
• Earlier Mercury/MerCruiser reference: 26-37641 / 37641.
• Molded rubber seal for select exhaust tube and exhaust housing pocket locations.
• GTIN/UPC reference associated with the earlier part family: 745061139763.
• Listed dimensions: 3.75 in. L x 1.38 in. W x 2.50 in. H.
• Listed weight: 0.09 lb.
• Used where the Mercury/MerCruiser parts diagram specifically calls for this seal in the exhaust housing or lower-unit interface.

Application Compatibility

Common where-used application groups include select vintage Mercury outboards and MerCruiser sterndrive assemblies 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
• Select Mercury lower gearcase and exhaust housing assemblies using the matching exhaust tube seal
• 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 37641001, 26-37641, or 37641.

Serial Number Fitment Notice

Confirm fitment by engine or drive serial number, exhaust housing style, lower-unit configuration, water passage layout, and exact Mercury/MerCruiser parts diagram before ordering. Vintage Mercury outboards and early MerCruiser drives used many similar rubber seals across exhaust, cooling-water, driveshaft housing, and lower-unit mating locations.

When This Part Needs Replacement

Replace this seal if the original rubber is hardened, cracked, flattened, swollen, torn, missing, or damaged during lower-unit or driveshaft housing service. It should also be inspected when servicing water pump components, exhaust housing joints, cooling-water leaks, or any area where exhaust or water may be bypassing the intended passage.

Installation Notes

Clean the exhaust housing pocket, lower-unit mating surface, and surrounding water/exhaust passage area before installing the new seal. Remove old rubber, salt buildup, carbon residue, corrosion, and debris without gouging the sealing surfaces. Inspect the water tube, exhaust tube, lower-unit housing, driveshaft housing, fasteners, and related gaskets while the assembly is apart. Install the seal in the exact orientation shown in the Mercury/MerCruiser service diagram.

Alternate/Superseded Part Numbers

• 37641001 — current Mercury service part number
• 26-37641 — earlier Mercury/MerCruiser formatted part number
• 37641 — earlier short part number

Parts Desk Insight

Exhaust tube seals on older outboards and sterndrives should be replaced when the housing joint is disturbed. A compressed or aged seal may not reseal correctly after disassembly, which can allow exhaust or cooling water to bypass the intended passage and create repeat service work after reassembly.

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