Sierra 18-5280 Delco EST 4-Cylinder Marine Ignition Tune-Up Kit

The Sierra 18-5280 Tune-Up Kit is specifically engineered for 4-cylinder marine engines equipped with Delco EST (Electronic Spark Timing) ignitions. This kit is designed for In-Line 4-cylinder, 2.5 and 3.0-liter GM engines with electronic ignition prior to 2002. This essential maintenance kit helps restore peak ignition performance by replacing worn distributor components that degrade from heat, moisture, and electrical stress in harsh marine environments.

Kit Includes:

• 18-5361 Distributor Cap with high-quality brass terminals for maximum conductivity and corrosion resistance
• 18-5406 Rotor precision-molded to ensure exact fit and consistent spark delivery

Replaces OEM Part Numbers:

• MerCruiser 811635Q2, 811635Q1, 811635T2
• GLM 71830, Mallory 9-29320
• OMC Stern Drive applications

Compatible Applications:

• MerCruiser, OMC, Crusader, Indmar, and Yamaha sterndrive or inboard motors
• Compatible with Sierra's 18-5475 Delco HEI distributor (GM 4-cylinder)
• Designed for Delco EST distributors with Male/HEI screw-down cap style

Each Sierra product meets or exceeds the original equipment part it replaces, ensuring reliable ignition performance and improved engine starting. Regular replacement of these critical ignition components helps prevent misfires, improves fuel efficiency, and maintains proper spark timing for smooth operation on the water.