Crankshaft Position Sensor – Fits MerCruiser Volvo Penta 4.3L 5.0L 6.2L (Replaces 864297T01, 864297, 3858979)

Product Details

This Crankshaft Position Sensor is designed for MerCruiser and Volvo Penta marine engines, including 4.3L, 5.0L, and 6.2L models from 1998 to 2010. The sensor monitors crankshaft rotation and position, providing critical data to the engine control module for precise ignition timing and fuel delivery.

This aftermarket replacement directly crosses to Mercury MerCruiser 864297T01, 864297, 864297001, OMC Volvo Penta 3858979, and Sierra Marine 18-7556.

• Direct bolt-on replacement for factory crankshaft sensors
• Compatible with GM V8 marine engine platforms
• Suitable for freshwater and saltwater applications

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Sensor Type

Crankshaft Position Sensor

Application

Marine Engine

Engine Displacement

4.3L, 5.0L, 6.2L

Compatible Engine Series

GM V8 (305-350)

What's in the Box

• 1× Crankshaft Position Sensor (for marine engine use)

Installation Notes

1. Disconnect battery negative terminal before beginning work.
2. Locate the existing crankshaft position sensor on the engine block, typically near the flywheel or harmonic balancer.
3. Disconnect the electrical connector from the old sensor.
4. Remove the mounting bolt(s) securing the sensor to the engine.
5. Carefully extract the old sensor from its mounting position.
6. Clean the mounting surface to remove any debris or corrosion.
7. Insert the new sensor into position, ensuring proper alignment with the reluctor ring or trigger wheel.
8. Install and torque the mounting bolt(s) to manufacturer specifications.
9. Reconnect the electrical connector, ensuring a secure fit.
10. Reconnect the battery and clear any stored fault codes using a diagnostic tool if necessary.
11. Start the engine and verify normal operation and idle quality.

Troubleshooting & FAQ

What are the symptoms of a failing crankshaft position sensor?

Common signs include hard starting, rough idle, engine stalling, misfires, poor acceleration, and illuminated check-engine lights. The engine may also fail to start if the sensor provides no signal to the ECM.

Will this sensor work on both MerCruiser and Volvo Penta engines?

Yes, this sensor is designed to replace the OEM part on both MerCruiser 5.0L and 6.2L engines (1998–2010) and OMC/Volvo Penta 4.3L, 5.0L, and 6.2L models that originally used the referenced part numbers.

How do I confirm the correct sensor gap?

Most crankshaft position sensors are self-adjusting and do not require manual gap setting. Ensure the sensor is fully seated in its mounting position and torqued properly; the air gap will be correct by design.

Can a faulty sensor cause my engine to lose power?

Yes. An unreliable signal from the crankshaft position sensor can cause incorrect ignition timing and fuel delivery, leading to power loss, hesitation, or complete engine shutdown.

How often should this sensor be replaced?

Replace the sensor when you experience performance issues or fault codes related to crankshaft position. There is no fixed interval, but sensors typically last several years under normal marine conditions.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

• Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.