Mercury MerCruiser Quicksilver — Exhaust Tube Seal — 37641001
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Mercury MerCruiser Quicksilver Exhaust Tube Seal 37641001
The Mercury MerCruiser Quicksilver 37641001 is a genuine Mercury Marine OEM exhaust tube seal for select vintage Mercury outboard and MerCruiser sterndrive exhaust housing assemblies. It replaces the earlier 26-37641 / 37641 reference and seals the exhaust and cooling-water passage area at the exhaust tube, exhaust housing pocket, driveshaft housing or lower-unit interface, keeping gases and water routed through the intended housing channels.
Key Features
- Genuine Mercury Marine OEM exhaust tube seal
- Current Mercury service part number: 37641001
- Replaces earlier references: 26-37641 / 37641
- Molded rubber seal for select exhaust tube and exhaust housing pocket locations
- Dimensions: 3.75 in. L × 1.38 in. W × 2.50 in. H (95.3 × 35.1 × 63.5 mm)
Compatible Applications
Select vintage Mercury outboards and MerCruiser sterndrive assemblies, by serial number and diagram location:
- Mercury 65 HP outboards, serial 1765044 through 2119748
- Mercury 90 HP outboards, serial 1766824 through 1869775
- Mercury 100 HP and 110 HP outboards, serial 1768404 through 2318585
- Select Mercury lower gearcase and exhaust housing assemblies using the matching exhaust tube seal
- MerCruiser 120 / 140 / 165 sterndrive applications
- MerCruiser 470 / 485 applications
- MerCruiser 225-S / 228 / 233 / 250 / 260 / 888 / 898 applications
- MerCruiser Model 60 Renault 68 applications
Use this seal only where the Mercury or MerCruiser parts diagram 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 the exact 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 the seal if the rubber is hardened, cracked, flattened, swollen, torn, missing or damaged during lower-unit or driveshaft housing service. Inspect it whenever you service water pump components, exhaust housing joints or cooling-water leaks, or anywhere exhaust or water may be bypassing the intended passage.
Installation Notes
Clean the exhaust housing pocket, lower-unit mating surface and surrounding water and exhaust passages before installing. Remove old rubber, salt buildup, carbon residue, corrosion and debris without gouging the sealing surfaces. Inspect the water tube, exhaust tube, housings, fasteners and related gaskets while the assembly is apart, and install the seal in the exact orientation shown in the service diagram.
Alternate & Superseded Part Numbers
- 37641001 — current Mercury service part number
- 26-37641 — earlier formatted part number
- 37641 — earlier short part number
Technical FAQ
Does 37641001 replace 26-37641?
Yes. 37641001 is the current service number for the earlier 26-37641 / 37641 seal.
Can I reuse the old seal?
It isn't recommended. A compressed or aged seal may not reseal correctly once the housing joint has been separated.
Does this fit every vintage Mercury outboard?
No. Fitment depends on horsepower, serial range and diagram location, so confirm against your parts diagram.
Parts Desk Insights
Best use: Replacing the exhaust tube seal any time the exhaust housing, driveshaft housing or lower unit is separated on a listed vintage Mercury outboard or MerCruiser drive.
Most common mistake: Reusing the original seal after disassembly. Aged rubber rarely reseals, which can let exhaust or cooling water bypass the intended passage and lead to repeat service work.
Sizing and fitment: Match your serial number to the ranges above and confirm the diagram calls for 37641001, 26-37641 or 37641. Similar-looking seals were used in nearby locations, so compare shape and orientation with the original before installing.
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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Important:
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