Sierra 18-7703 Knock Sensor for Mercruiser Volvo Penta OMC GM V-8 Engines

The Sierra 18-7703 is a replacement knock sensor designed for marine applications including Mercruiser, Volvo Penta, and OMC stern drive engines. This sensor monitors engine detonation and knock conditions, sending critical data to the engine control module to optimize ignition timing and prevent engine damage.

Key Features:

• Direct replacement for OEM knock sensors on GM V-8 marine engines
• Compatible with 454, 502, 540, and 572 cubic inch displacement engines
• Designed for harsh marine environments with corrosion-resistant construction
• Ensures optimal engine performance and fuel efficiency

OEM Cross-References:

• Mercruiser: 805544T, 8M0077616
• Volvo Penta: 3854512
• OMC Stern Drive: 3854512
• Mallory: 9-33500
• EMP: 1300-36040

This Sierra marine sensor meets or exceeds original equipment specifications, providing reliable performance for your stern drive or inboard engine. Essential for maintaining proper engine operation on GM V-8 powered boats from the early 1990s through 2019 model years.