If you’re maintaining or upgrading your Mercury 280 2.5 Liter EFI ROS (Race Offshore) Outboards, the Cylinder Head O-Ring Jacket & Seal Kit from Buckshot Racing #77 is an essential component to ensure reliable performance and longevity of your engine.
 
This kit is designed to fit Mercury 280HP 2.5L EFI outboards and includes all the necessary components to service the cylinder heads of your engine.
 
Kit Contents
 
1 x O Ring, Cylinder Head Jacket Gasket
OEM Part Number: 849616
Cross-Reference Part Numbers: 8M0149612, 849616
 
3 x O Ring, Cylinder Bore Seal
OEM Part Number: 817574
Cross-Reference Part Numbers: 8584531, 817574
 
This kit is compatible with the Mercury Racing 280 and is manufactured to meet or exceed OEM specifications, ensuring a precise fit and reliable performance for your engine.
 
Performance Features
 
Cylinder Head O-Ring Jacket Gasket (849616): Ensures a robust seal between the cylinder head and engine block, preventing coolant leaks and maintaining optimal engine temperature.
 
Cylinder Bore O-Ring Seal (817574): Provides secure sealing around the cylinder bores, ensuring proper pressure and avoiding contamination.
 
The components in this kit are made using high-quality materials and precision manufacturing, ensuring your engine runs reliably under all conditions.
 
Installation Tips for Mercury 280 ROS Outboards
 
Step-by-Step Instructions:
 
Remove the Cylinder Head: Disconnect coolant lines and remove the fasteners securing the cylinder head.
 
Inspect Surfaces: Ensure that the cylinder head and block surfaces are clean, flat, and free from damage.
 
Position the O Rings: Place the O Ring, Cylinder Head Seal (849616) and O Ring, Cylinder Bore Seal (817574) securely into their respective grooves.
 
Reassemble the Cylinder Head: Bolt the cylinder head back onto the engine, following the manufacturer’s torque specifications.
 
Repeat for Opposite Cylinder (if necessary): Use a second kit for the other cylinder head.
 
Maintenance Recommendations
 
Regular maintenance of your cylinder head seals is crucial to the health of your engine. Replace the seals as part of your engine’s scheduled service, especially if you notice coolant leaks, compression loss, or overheating.
 
Using high-quality replacement parts ensures that your engine remains in excellent condition and operates reliably.
 
Why Regularly Check Your Cylinder Head Seals?
 
The O Rings and seals are critical for maintaining the integrity of your Mercury 280 ROS engine. Neglecting them can lead to significant damage, including overheating, pressure loss, and reduced engine performance.
 
By using Buckshot Racing #77’s kit, you’re investing in premium quality and reliability, ensuring your engine operates at peak performance.
 
Each Kit Contains: 1 x O-Ring, Cylinder Head Jacket Gasket Seal, 3 x O-Ring, Cylinder Bore Seals, If both heads on the V6 are being serviced, order 2 kits.
 
For any questions, contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com.