SKU: 26113381013

Ignition Sensor Kit – Fits MerCruiser GM V6 & V8 with Thunderbolt IV & V Ignition (Replaces 87-91019A2)

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Description

Ignition Sensor Kit – Fits MerCruiser GM V6 & V8 with Thunderbolt IV & V Ignition (Replaces 87-91019A2)Ignition Sensor Kit Fits MerCruiser GM V6 & V8 with Thunderbolt IV & V Ignition (Replaces 87 91019A2) This ignition sensor kit is designed for MerCruiser V6 & V8 engines (4. 3L, 5. 0L, 5. 7L, 7. 4L, 8. 2L) equipped with Thunderbolt IV & V electronic ignition systems from 19811997. It serves as a direct replacement, ensuring reliable ignition performance for a wide range of popular marine engines. Engineered for marine environments, this component

Ignition Sensor Kit – Fits MerCruiser GM V6 & V8 with Thunderbolt IV & V Ignition (Replaces 87-91019A2)

This ignition sensor kit is designed for MerCruiser V6 & V8 engines (4.3L, 5.0L, 5.7L, 7.4L, 8.2L) equipped with Thunderbolt IV & V electronic ignition systems from 1981–1997. It serves as a direct replacement, ensuring reliable ignition performance for a wide range of popular marine engines.

Engineered for marine environments, this component provides a cost-effective solution for restoring your engine's ignition timing and performance. It directly replaces multiple OEM part numbers, including Mercury/MerCruiser 87-892150Q02, 87-91019A2, Sierra 18-5116-1, and Mallory 9-29804.

  • Installation Method: Direct replacement for a straightforward installation.
  • Durable Construction: Features a glass-filled polyester housing for enhanced durability and corrosion resistance.
  • Complete Kit: Includes the ignition sensor, lead wires with connectors, and all necessary mounting hardware.

Part Number Cross-Reference

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

Brand Part Number
Mercury/MerCruiser 87-892150Q02
Mercury/MerCruiser 87-892150A02
Mercury/MerCruiser 87-91019A3
Mercury/MerCruiser 87-91019A2
Mercury/MerCruiser 861780A2
Mercury/MerCruiser 861780K4
Mercury/MerCruiser 861780Q4
Mercury/MerCruiser 87-892150K02
Mercury/MerCruiser 892150A02
Mercury/MerCruiser 91019A6
Sierra 18-5116-1
Mallory 9-29804

Compatible Engine Models

Confirm your engine model/year in the table below.

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser V6 4.3L 205 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser V8 5.0L 240-260 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser V8 5.7L 260-350 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser V8 7.4L 320-425 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser V8 8.2L 425-500 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser MR 350 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser MAG 350 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser ALPHA [Data Needed] 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser BRAVO [Data Needed] 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser 454 450 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser 465 465 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser 502 500-525 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser 575 575 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition
MerCruiser 600 600 4-Stroke 1981-1997 87-91019A2 Thunderbolt IV & V ignition

Technical Specifications

Specification Value
Product Type Ignition Sensor Kit
Installation Direct replacement
Housing Material Glass-filled polyester
Connection Lead wires with connectors
Other Technical Attributes Designed for marine applications with corrosion resistance

Package Contents

  • 1 x Ignition Sensor (Replaces 87-91019A2)
  • 1 x Set of Lead Wires with Connectors
  • 1 x Hardware Kit (mounting screws and fasteners)

Installation Guide

  1. Safety First: Disconnect the boat's battery before beginning any electrical work.
  2. Access the Distributor: Remove the distributor cap to locate the existing ignition sensor.
  3. Disconnect Wires: Carefully unplug the wire connectors leading to the old sensor.
  4. Remove Old Sensor: Unscrew the mounting hardware holding the sensor in place and remove it from the distributor.
  5. Install New Sensor: Position the new ignition sensor and secure it using the fasteners from the provided hardware kit.
  6. Connect New Wires: Attach the new lead wires and ensure the connectors are firmly seated.
  7. Final Checks: Reinstall the distributor cap, reconnect the battery, and start the engine to test for proper operation.

Troubleshooting & FAQ

Q: How do I confirm this ignition sensor fits my MerCruiser engine?

A: This sensor is made for MerCruiser V6 and V8 engines (including 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L models) from 1981-1997 that use a Thunderbolt IV or V ignition system. To ensure a perfect match, please check your engine model against the "Compatible Engine Models" table and verify your original part number with our cross-reference list.

Q: What are the common signs of a failing ignition sensor?

A: Symptoms of a faulty ignition sensor often include engine misfires, rough idling, difficulty starting, stalling, or a complete failure to start. You may also notice a significant loss of engine power during acceleration.

Q: Is this a complete kit for installation?

A: Yes, this kit includes the ignition sensor module, a set of lead wires with the correct connectors, and a hardware kit containing mounting screws and fasteners. It provides all the necessary components for a direct replacement.

Q: OEM vs. Aftermarket?

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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 26113381013

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Reviewed in the United States on June 2, 2026
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Maria Peters
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This is a great dog toy! My Pomeranian is a small guy at only 8lbs. but he sure knows how to chew and he does it as often as he can. I was throwing out toy after toy because he was tearing them to pieces after only a half hour or so. After putting my money in the garbage so many times, I decided to search for toys that would hold up to his destructive mouth. I found a lot that claimed they wouldn't fall apart but they were all more than I wanted to spend. I came across this toy and a rabbit shaped one just like this. I bought both months ago and both are still in tact after all this time. Sure the edges are a little frayed but other than that, no damage whatsoever! I'm not sure what dura fused means but that seemed promising to me when I was reading the description, also the fact that they're leather made them seem more durable to me. Both have squeakers inside and some sort of stuffing as well. I throw all of my dogs toys in the laundry or hand wash them once a week, except for these. When these toys get wet with my dogs saliva, they look like they're not meant to get wet. Even without washing, these seem fine. This toy is probably about 9" long or so if I had to guess. In my opinion, it'd be perfect for a medium sized dog. It's a tiny bit big for my little guy but he manages just fine! If you're looking for a durable toy that your small to medium dog can chew on constantly, look no further!
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GK5040
Alexandria, US
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