The Mercury Exhaust Divider Gasket Kit, replacing Mercury OEM part numbers 90484 and 904841, is a critical sealing component used on Mercury 2.0L and 2.4L V6 outboards produced from approximately 1979 through 1989.
Offered by Buckshot Racing #77, this kit seals the exhaust divider plate to the cylinder block, helping separate cooling water passages from the exhaust cavity while maintaining proper cooling system integrity and exhaust flow control.
Because the exhaust divider area is exposed to constant heat cycling, vibration, exhaust pressure, and water exposure, gasket condition is extremely important on Mercury V6 engines.
Fits Mercury 2.0L & 2.4L V6 Outboards
This gasket kit fits many Mercury 2.0-liter and 2.4-liter V6 carbureted and EFI outboards, including:
- Mercury V-135
- Mercury V-150
- Mercury V-150 XR2
- Mercury V-175
- Mercury V-200
- Mercury XR4
- Mercury Magnum
- Mercury Marathon
These engines became extremely popular on bass boats, offshore boats, performance fishing boats, and recreational V6 outboard applications because of their lightweight design, strong acceleration, and high-RPM capability.
Why Exhaust Divider Gaskets Matter
The exhaust divider plate mounts directly to the rear of the cylinder block and separates hot exhaust gases from the engine’s internal cooling water passages.
Over time, repeated heating and cooling cycles can cause older gaskets to become brittle, compressed, or damaged. Corrosion around the divider surfaces and water jackets can also create sealing problems.
A leaking divider gasket may contribute to cooling system pressure loss, steam in the exhaust, uneven engine temperatures, water leakage, or internal corrosion.
On Mercury 2.0L and 2.4L V6 engines, maintaining proper divider sealing is important for cooling efficiency, engine reliability, and long-term durability.
Complete Two (2) Gasket Kit
The Buckshot Racing #77 kit includes two exhaust divider gaskets, which is the correct quantity required per engine.
Because the divider plate seals against both sides of the exhaust divider assembly, two gaskets are required during reassembly to properly seal the cooling passages and exhaust cavity.
Replacing both gaskets during divider plate service, tuner replacement, cooling system maintenance, or powerhead rebuilding is strongly recommended.
OEM & Cross Reference Information
This gasket kit replaces Mercury OEM part numbers 90484 and 904841.
Additional cross-reference numbers commonly associated with this application include 654, 18-2502, 32150, 508823, 521-30, and 87396.
These references are commonly associated with Mercury 2.0L and 2.4L V6 exhaust divider gasket applications.
The Mercury 904841 Exhaust Divider Gasket Kit remains an important service component for maintaining cooling system integrity and exhaust sealing on classic Mercury 2.0L and 2.4L V6 outboards.
Includes Two (2) Gaskets for Mercury 2.0L & 2.4L V6 Outboards
Whether servicing a Mercury XR2, XR4, V-150, V-175, V-200, Magnum, or Marathon engine, replacing worn exhaust divider gaskets helps protect against cooling system leaks, overheating, and internal corrosion.
At Buckshot Racing #77, we continue supporting classic Mercury V6 owners with the correct OEM replacement parts, technical knowledge, and proven components needed to keep legendary Mercury 2-strokes running strong.