Mercury MerCruiser Exhaust Tube Seal - 37641001
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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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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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