Mercury MerCruiser Ignition Sensor Assembly 892150K02

Mercury / MerCruiser Quicksilver Ignition Sensor Assembly — 892150K02

The Mercury Quicksilver 892150K02 Ignition Sensor Assembly is a genuine OEM distributor ignition trigger sensor used on many MerCruiser gasoline sterndrive and inboard engines equipped with Thunderbolt ignition systems. It detects distributor shaft rotation and sends a signal to the ignition module to control spark timing.

Key Specifications

• Part Number: 892150K02

• Mercury Format: 87-892150Q02

• Component Type: Distributor ignition sensor assembly

• Ignition System: Thunderbolt IV / Thunderbolt V

• OEM Brand: Mercury Marine / Quicksilver

Compatible Engines / Applications

Commonly used on MerCruiser GM-based marine engines, including:

• 4.3L V6

• 5.0L V8 (305 CID)

• 5.7L V8 (350 CID / 350 MAG)

• 7.4L V8 (454 CID)

• 8.2L V8

Typically found on engines produced approximately 1981–1997 using distributor-based ignition systems.

Function

The ignition sensor is mounted inside the distributor housing and acts as the trigger for the ignition system. As the distributor shaft rotates, the sensor sends timing signals to the Thunderbolt ignition module, which then fires the ignition coil and spark plugs at the correct time.

This ensures:

• Accurate spark timing

• Smooth engine operation

• Proper engine performance and efficiency

Symptoms of a Faulty Ignition Sensor

A failing ignition sensor may cause:

• Hard starting or no-start condition

• Engine misfires

• Intermittent engine shutdown

• Loss of spark signal

Replacing the ignition sensor restores proper ignition timing and reliable starting.

⚠️ Fitment Tip:
Always verify compatibility using the engine model and serial number. MerCruiser engines transitioned from distributor sensors to crankshaft-based ignition systems in later MPI models, so the correct sensor depends on the ignition system installed.

Shipping:

OEM parts ship same or next day for fast Canada wide shipping.