Sierra 118-5516 Delco EST Distributor Timing Tool

The Sierra 118-5516 is a specialized timing tool designed for marine engines equipped with Delco EST (Electronic Spark Timing) distributors. This essential tool allows technicians to properly set base timing on engines that cannot be placed in base timing mode using standard diagnostic equipment.

Key Features:

• Specifically designed for Delco EST distributor-equipped engines
• Enables accurate base timing adjustment when diagnostic tools cannot access base timing mode
• Essential for proper ignition timing setup and maintenance
• Compatible with GM marine engines ranging from 5.7L to 7.4L
• Professional-grade timing harness tool

This timing tool is commonly included in Sierra's Delco EST conversion kits and is an indispensable diagnostic tool for marine technicians working on GM-based marine engines with electronic ignition systems. Proper ignition timing is critical for optimal engine performance, fuel efficiency, and preventing issues such as knocking, hard starting, and overheating.