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Sierra 18-7556Sierra 18 7556 Crankshaft Position Sensor Essential Engine Management Component Ensure reliable engine performance and eliminate misfires with the Sierra 18 7556 Crankshaft Position Sensor. Designed for MerCruiser 5. 0L and 6. 2L fuel injected engines, this precision sensor provides critical timing information to the engine control module for optimal ignition timing and fuel delivery. Key Features & Benefits OEM Replacement Quality Direct replacement

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Sierra 18-7556 Crankshaft Position Sensor - Essential Engine Management Component

Name: Sierra 18-7556
Brand: os-recordingstudio.com
SKU: 57742835218
Price: 145.49 USD
Availability: InStock
Rating: 4.3420000000000005 (605 reviews)

Ensure reliable engine performance and eliminate misfires with the Sierra 18-7556 Crankshaft Position Sensor. Designed for MerCruiser 5.0L and 6.2L fuel-injected engines, this precision sensor provides critical timing information to the engine control module for optimal ignition timing and fuel delivery.

Key Features & Benefits

OEM Replacement Quality - Direct replacement for MerCruiser 864297001 and related part numbers
Precision Signal Output - Accurate crankshaft position detection for optimal engine timing
Marine-Grade Construction - Built to withstand harsh marine environments and temperature extremes
Composite Cover Compatible - Specifically designed for engines with composite timing covers
Plug-and-Play Installation - Direct connector fitment for straightforward replacement
Enhanced Reliability - Eliminates engine misfires and performance issues

Technical Specifications

Manufacturer:	Sierra Engine Parts
Part Number:	18-7556
UPC Code:	808282340834
Sensor Type:	Magnetic Crankshaft Position Sensor
Signal Type:	Variable Reluctance
Application:	Fuel-Injected Marine Engines

Engine Compatibility

Direct Replacement For:

MerCruiser 864297
MerCruiser 864297001
MerCruiser 864297T01
Indmar 556293
Volvo 3858979
Mallory 9-298820
Marine Power 464228

Compatible Engine Applications:

MerCruiser 5.0L MPI (1998-2010)
MerCruiser 6.2L MPI (1998-2010)
MerCruiser 5.7L Fuel Injected
MerCruiser 350 MAG
MerCruiser 525 EFI
Various GM V8 Marine Engines with Composite Timing Covers

Important: Only fits engines with composite (plastic) timing covers - NOT compatible with metal timing covers

Installation & Service

Installation Requirements:

Verify engine has composite timing cover before ordering
Disconnect battery before beginning work
Remove engine cover to access sensor location
Disconnect electrical connector from old sensor
Remove sensor mounting bolt and extract sensor
Install new sensor with proper torque specifications
Reconnect electrical connector ensuring secure fit
Clear any stored diagnostic codes after installation

Why Choose Sierra Engine Sensors?

Sierra Marine has been manufacturing premium engine management components for over 40 years. Their crankshaft position sensors are engineered to meet or exceed OEM specifications, using advanced magnetic technology that provides accurate signal output in demanding marine environments. Each sensor undergoes rigorous testing to ensure reliable performance and longevity.

Signs You Need This Sensor

Engine misfires or rough running
Intermittent stalling or no-start conditions
Check engine light activation
Poor acceleration or loss of power
Engine beeping or alarm activation
Diagnostic codes related to crankshaft position

Critical Engine Function

The crankshaft position sensor serves essential functions:

Ignition Timing - Provides ECM with precise crankshaft position for optimal spark timing
Fuel Injection Timing - Controls fuel injector pulse timing for efficient combustion
Engine Speed Monitoring - Measures RPM for engine management calculations
Misfire Detection - Enables ECM to detect and correct engine misfires
Starting System - Critical for engine start-up and initial timing

Diagnostic Capabilities

Common Diagnostic Trouble Codes:

P0335 - Crankshaft Position Sensor Circuit Malfunction
P0336 - Crankshaft Position Sensor Range/Performance
P0385 - Crankshaft Position Sensor B Circuit Malfunction
Related misfire codes (P0300-P0308)

Performance Benefits

A functioning crankshaft position sensor ensures:

Smooth Engine Operation - Eliminates misfires and rough idling
Optimal Fuel Economy - Precise timing reduces fuel consumption
Enhanced Power Output - Proper timing maximizes engine performance
Reduced Emissions - Accurate fuel delivery improves combustion efficiency
Reliable Starting - Consistent signal enables dependable engine starts

Frequently Asked Questions

How do I know if my timing cover is composite or metal?

Composite timing covers are made of black plastic material, while metal covers are aluminum or steel. This sensor only fits engines with composite (plastic) timing covers.

What are the symptoms of a failing crankshaft position sensor?

Common symptoms include engine misfires, rough running, stalling, check engine light, poor acceleration, and intermittent no-start conditions.

Can I test the sensor before replacement?

Yes, the sensor can be tested with a digital multimeter or oscilloscope. However, intermittent failures may require replacement for reliable diagnosis.

Do I need to clear codes after installation?

Yes, clear any stored diagnostic trouble codes after sensor replacement and test drive to ensure proper operation and no code recurrence.

Will this sensor work on my specific engine year?

This sensor fits 5.0L and 6.2L MerCruiser engines from 1998-2010 with composite timing covers. Verify your engine specifications and part number for exact compatibility.

Warranty & Support

Sierra Marine Parts are backed by manufacturer warranty against defects in materials and workmanship. Professional installation and proper diagnostic procedures ensure optimal performance and system reliability.

CRANKSHAFT SENSOR MC#864297001

SKU: NVN-4004155
MPN: 18-7556
UPC: 808282340834