Ignition Sensor For MerCruiser Thunderbolt 87-91019A3 87-892150Q02, 18-5116-1

Ignition Sensor for MerCruiser

This ignition sensor for MerCruiser Thunderbolt systems replaces OEM part numbers 87-91019A3, 87-892150Q02, and 18-5116-1, providing reliable spark timing for marine engines. It is designed to work with MerCruiser Thunderbolt ignition systems to ensure consistent engine performance. The ignition sensor helps maintain optimal combustion in your MerCruiser stern drive or inboard engine.

Overview

The ignition sensor for MerCruiser is a direct replacement component that restores proper ignition timing in Thunderbolt-equipped engines. It is intended for boat owners and marine mechanics who need a dependable sensor for MerCruiser motors. This ignition sensor delivers the signal needed for accurate spark advance under varying loads.

Built For Performance

• Precision-ground sensing tip for consistent trigger signal
• Rugged construction resists moisture and vibration common in marine environments
• Direct-fit design eliminates modifications for most MerCruiser Thunderbolt applications
• Replaces multiple OEM numbers for broad compatibility
• Tested to meet original equipment specifications for timing accuracy

On-The-Job Use

• Used in MerCruiser stern drive engines for daily boating
• Commonly installed during tune-ups on Thunderbolt ignition systems
• Suitable for saltwater and freshwater marine applications
• Ideal for both recreational powerboats and fishing vessels

Specs At A Glance

Good To Know

Q: Will this ignition sensor fit all MerCruiser engines? A: It fits MerCruiser models equipped with Thunderbolt ignition systems, but always verify your engine’s serial number and existing part number before purchase.

Q: How do I install this ignition sensor? A: Installation involves removing the old sensor, cleaning the mounting area, and securing the new sensor to the specified gap; consult your service manual for exact procedure.

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