Sierra Crankshaft Sensor 18-7556 for Mercury 5.0L/6.2L 1998-2010, Replaces 864297001

The Sierra 18-7556 Crankshaft Sensor is a direct-fit replacement crankshaft position sensor built for Mercury 5.0L and 6.2L inboard engines from 1998-2010. This sensor mounts to the engine block via a flange mount and monitors crankshaft position to help the ignition system deliver accurate spark timing, a critical function for smooth starting, stable idle, and consistent engine performance. The housing is constructed of metal and is rated to withstand temperatures up to 400 degrees Fahrenheit, standing up to the heat and vibration found in the engine compartment. Each unit ships as a single sensor, ready to install as a one-for-one swap for a failed or worn factory sensor. Sierra builds every replacement part to meet or exceed the specification of the original equipment part it replaces, so performance and fit match what the engine was designed around. This sensor directly replaces Mercruiser Stern Drive part number 864297001 and is intended for boat owners and marine technicians servicing Mercury 5.0L and 6.2L inboard powerplants within the 1998-2010 range. Before ordering, confirm the sensor matches your engine's original equipment specification.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7556
• Product Type: Crankshaft Sensor
• Dimensions: 3.5 x 3.5 x 1.5 inches
• Weight: 0.14 pounds
• Material: Metal
• Mounting Type: Flange Mount
• Output Type: Push Button
• Upper Temperature Rating: 400 Degrees Fahrenheit
• UPC: 808282340834
• Included Components: One crankshaft sensor

Fitment

• Mercury 5.0L, 6.2L, 1998-2010

Replaces (OEM)

• 864297001

Frequently Asked Questions

What engines does the Sierra 18-7556 crankshaft sensor fit? The 18-7556 fits Mercury 5.0L and 6.2L inboard engines built from 1998 through 2010.

What OEM part number does this sensor replace? It is a direct replacement for OEM part number 864297001.

What is the crankshaft sensor made of? The 18-7556 sensor housing is metal, built to hold up to engine-bay heat and vibration.

How does the sensor mount to the engine? It uses a flange mount, matching the original equipment mounting configuration on Mercury 5.0L and 6.2L blocks.

What temperature can the sensor withstand? The 18-7556 carries an upper temperature rating of 400 degrees Fahrenheit.

What are the dimensions of the 18-7556 sensor? It measures 3.5 x 3.5 x 1.5 inches.

How much does the crankshaft sensor weigh? The Sierra 18-7556 weighs 0.14 pounds.

What is included when I order this part? One Sierra 18-7556 crankshaft sensor ships per order; no other hardware is included.

Is this a genuine Mercury part or an aftermarket replacement? The 18-7556 is a Sierra aftermarket replacement, built to meet or exceed the specification of the original equipment sensor it replaces.

What does a crankshaft sensor do on these Mercury engines? On Mercury 5.0L and 6.2L inboard engines, the crankshaft sensor monitors crankshaft position so the ignition system can time spark correctly, which affects starting and idle quality.

Should I confirm fitment before ordering? Yes, check that part number 18-7556 matches your engine's original crankshaft sensor specification before purchasing.