864297T01 Crankshaft Position Sensor for Mercury Volvo Penta | JLM Marine

Crankshaft Position Sensor for Mercury & Volvo Penta 4.3L, 5.0L, 6.2L Marine Engines – OEM# 864297T01

This crankshaft position sensor is designed to fit Mercury MerCruiser and OMC Volvo Penta marine engines, including popular 4.3L, 5.0L, and 6.2L models. It ensures accurate engine timing and reliable performance for inboard and sterndrive applications.

Directly replaces Mercury MerCruiser part numbers 864297, 864297T01, 864297001, OMC Volvo Penta 3858979, and Sierra Marine 18-7556. This sensor is engineered to OEM specifications for seamless compatibility and dependable operation.

• Fits both Mercury MerCruiser and OMC Volvo Penta marine engines
• Suitable for 4.3L, 5.0L, and 6.2L engine platforms
• Direct bolt-on replacement for easy installation

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands:

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

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

Installation Guide

1. Disconnect the negative battery cable to ensure safety during installation.
2. Locate the crankshaft position sensor on your engine block, typically near the flywheel or harmonic balancer.
3. Disconnect the electrical connector from the old sensor by pressing the release tab.
4. Remove the mounting bolt(s) securing the sensor to the engine block using the appropriate socket or wrench.
5. Carefully extract the old sensor from its mounting position.
6. Inspect the mounting area and clean any debris or corrosion to ensure proper sensor seating.
7. Insert the new crankshaft position sensor into the mounting hole, ensuring proper alignment.
8. Hand-tighten the mounting bolt(s), then torque to manufacturer specifications (typically 70–90 in-lbs; consult your service manual).
9. Reconnect the electrical connector firmly until you hear or feel a click.
10. Reconnect the negative battery cable and turn the ignition to the "on" position (do not start the engine yet).
11. Check for diagnostic trouble codes; clear any existing codes if necessary.
12. Start the engine and verify smooth operation and proper idle. Monitor for warning lights or irregular performance.

Troubleshooting & FAQ

Q: How do I know if my crankshaft position sensor has failed?
A: Common symptoms include difficulty starting the engine, rough idling, stalling, misfires, or the check engine light illuminating. A diagnostic scanner may display codes related to crankshaft position (e.g., P0335, P0336).

Q: How do I confirm this sensor fits my specific engine?
A: Cross-reference your engine's model, year, and displacement with the compatibility table above. Verify your current sensor's part number matches one of the OEM numbers listed (864297T01, 3858979, 18-7556, etc.).

Q: Can I install this sensor myself, or do I need a mechanic?
A: Installation is straightforward for those with basic mechanical skills and tools. However, professional installation is recommended to ensure proper torque specs and diagnostic verification, especially if you're unfamiliar with marine engine systems.

Q: How often should I replace the crankshaft position sensor?
A: Crankshaft position sensors typically last 100,000+ miles or 10+ years under normal conditions. Replace it immediately if you experience failure symptoms or if diagnostic codes appear.

Q: What's the difference between this aftermarket sensor and the OEM version?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.