6JC-11181-00-00 Head Gasket for Yamaha 242 S 1800 2020

Head Gasket for Yamaha

This head gasket for Yamaha marine engines seals the cylinder head to the engine block, and it cross-references OEM part number 6JC-11181-00-00.

Overview

This head gasket for Yamaha is a sealing component that sits between the cylinder head and engine block on 1800 series marine engines. It maintains compression and keeps coolant and oil from mixing where the head meets the block, protecting engine performance on the water. It is intended for owners and technicians servicing the Yamaha 242 S from 2020.

Built For Performance

• Seals the cylinder head to block mating surface
• Holds combustion compression within the cylinder
• Separates coolant and oil passages at the joint
• Cross-references OEM part number 6JC-11181-00-00
• Constructed for marine engine heat and load conditions

Fits These Machines

• for Yamaha 242 S 1800, 2020

On-The-Job Use

• Engine top-end rebuilds
• Cylinder head removal and reinstallation
• Compression loss diagnostics and repair
• Routine marine engine maintenance

Specs At A Glance

Good To Know

Q: Should the head bolts be replaced along with this gasket? A: Many engine builders recommend new head bolts on reassembly, so check the service manual for torque-to-yield specifications before reuse. Always follow the proper torque sequence.

Q: Can this gasket be reused if the engine is disassembled again? A: Head gaskets are single-use items and should be replaced each time the cylinder head is removed. Reusing one risks leaks and compression loss.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.