8M0011987 Camshaft Position Sensor for Mercury Mariner Verado | JLM Marine

8M0011987 Camshaft Position Sensor for Mercury Mariner Verado Outboards

This camshaft position sensor is engineered to fit Mercury Verado and Mariner outboard engines from 135HP to 400HP, as well as MerCruiser Sterndrive Gas Engines 9.0L 552 CID V8. It ensures precise camshaft timing detection for optimal engine performance and reliable ignition control across a wide range of high-performance marine applications.

This sensor directly replaces OEM part numbers 880609 and 8M0011987, providing a reliable aftermarket solution for maintaining your engine's camshaft position monitoring system.

• Direct replacement for Mercury Mariner part numbers 880609 and 8M0011987
• Compatible with Mercury Verado, Mariner outboards (135HP–400HP), and MerCruiser 9.0L V8 sterndrives
• Ensures accurate camshaft timing detection for optimal engine performance

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

Your package includes:

• 1× Camshaft Position Sensor

Installation Guide

1. Disconnect the battery: Always disconnect the negative battery terminal before beginning any electrical work to prevent accidental shorts or injury.
2. Locate the camshaft position sensor: Consult your engine's service manual or parts diagram to identify the exact location of the sensor on your specific model.
3. Disconnect the electrical connector: Carefully unplug the wiring harness connector from the old sensor. Press any locking tabs if present.
4. Remove the mounting hardware: Unscrew the bolt(s) securing the sensor to the engine block or cylinder head using the appropriate socket or wrench.
5. Extract the old sensor: Gently pull the sensor out of its housing. Note the orientation and any O-rings or seals that may need replacement.
6. Inspect the mounting surface: Clean any debris, oil residue, or old gasket material from the sensor mounting area to ensure a proper seal.
7. Install the new sensor: Insert the new camshaft position sensor into the mounting hole, ensuring correct alignment and orientation.
8. Secure the sensor: Hand-tighten the mounting bolt(s) first, then torque to manufacturer specifications (typically 8–12 Nm / 71–106 in-lbs, but verify in your service manual).
9. Reconnect the electrical connector: Plug the wiring harness connector firmly onto the new sensor until you hear or feel it click into place.
10. Reconnect the battery: Reattach the negative battery terminal and ensure all connections are secure.
11. Clear any diagnostic codes: Use a marine diagnostic tool to clear any stored fault codes related to the camshaft position sensor.
12. Test the engine: Start the engine and verify smooth operation, checking for warning lights or fault codes. Confirm proper idle and throttle response.

Troubleshooting & FAQ

Q: How do I confirm this camshaft position sensor fits my engine?
A: Cross-reference your original part number (880609 or 8M0011987) with our compatibility table. Verify your engine model, horsepower, and year against the fitment chart above. If you're unsure, consult your engine's parts diagram or contact our support team with your engine serial number.

Q: What are the signs of a failing camshaft position sensor?
A: Common symptoms include rough idling, engine stalling, difficulty starting, misfires, reduced power, hesitation during acceleration, and illuminated warning lights or fault codes (often related to ignition timing or sensor circuit faults).

Q: How often should I replace the camshaft position sensor?
A: Camshaft position sensors typically do not have a scheduled replacement interval; they should be replaced when they fail or show signs of malfunction. Regular diagnostic scans and monitoring engine performance can help detect sensor issues early.

Q: Can I use this sensor on both Verado and standard Mariner outboards?
A: Yes, this sensor is designed to fit Mercury Verado and Mariner outboards from 135HP to 400HP, as well as MerCruiser 9.0L V8 sterndrive engines. Always verify compatibility with your specific engine model and serial number before installation.

Q: Will installation of this sensor require recalibration or programming?
A: In most cases, no special programming is required. After installation, clear any stored fault codes with a diagnostic tool and allow the ECU to relearn sensor parameters during normal operation. Consult your service manual for model-specific procedures.

Q: Is this an OEM part or an aftermarket replacement?
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.