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Ignition Sensor Kit – Fits MerCruiser Thunderbolt IV & V Ignition (Replaces 87-892150Q02, 87-91019A3)
- $26.99
$32.00- $26.99
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Ignition Sensor Kit – Fits MerCruiser Thunderbolt IV & V Ignition (Replaces 87-892150Q02, 87-91019A3)
This ignition sensor kit is designed for MerCruiser V6 and V8 marine engines (4.3L, 5.0L, 5.7L, 7.4L, 8.2L) equipped with Thunderbolt IV and 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 the harsh marine environment, this sensor features a glass-filled polyester housing for enhanced durability and corrosion resistance, ensuring a long service life.
- Direct Installation: Mounts directly in the distributor for a hassle-free replacement of the original sensor.
- Complete Kit: Includes the ignition sensor, lead wires with connectors, and all necessary mounting hardware.
- Broad Compatibility: Replaces a wide range of OEM part numbers for MerCruiser, Sierra, Mallory, and more.
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 | 861780Q4 |
| Mercury/MerCruiser | 87-892150K02 |
| Sierra | 18-5116-1 |
| Mallory | 9-29804 |
| CDI | E11-0005 |
| GLM | 73110 |
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.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 4.3L (2 BBL.) | 175-185 | 4-Stroke | 1985-1992 | 87-91019A2 | GM 262 V-6 |
| MerCruiser | 4.3L (GEN II) | 4-Stroke | 1992-1993 | 87-91019A2 | GM 262 V-6 | |
| MerCruiser | 4.3LX (4 BBL.) | 205 | 4-Stroke | 1987-1992 | 87-91019A2 | GM 262 V-6 |
| MerCruiser | 5.0L (4 BBL.) | 200-230 | 4-Stroke | 1981-1995 | 87-91019A2 | GM 305 V-8 |
| MerCruiser | 5.0LX (4 BBL.) | 4-Stroke | 1988-1995 | 87-91019A2 | GM 305 V-8 | |
| MerCruiser | 5.7L | 260-350 | 4-Stroke | 1986-1995 | 87-91019A2 | GM 350 V-8 |
| MerCruiser | 5.7L COMPETITION SKI | 4-Stroke | 1987-1995 | 87-91019A2 | GM 350 V-8 | |
| MerCruiser | 5.7L MIE | 4-Stroke | 1988-1995 | 87-91019A2 | GM 350 V-8 | |
| MerCruiser | 7.4L | 320-425 | 4-Stroke | 1981-1996 | 87-91019A2 | GM 454 V-8 |
| MerCruiser | 8.2L | 425-500 | 4-Stroke | 1990-1996 | 87-91019A2 | GM 502 V-8 |
| MerCruiser | 350 MAG ALPHA | 4-Stroke | 1986-1995 | 87-91019A2 | GM 350 V-8 | |
| MerCruiser | 454 MAG ALPHA | 4-Stroke | 1986-1988 | 87-91019A2 | GM 454 V-8 | |
| MerCruiser | 454 MAG BRAVO | 4-Stroke | 1988-1994 | 87-91019A2 | GM 454 V-8 | |
| MerCruiser | 502 MAG BRAVO | 4-Stroke | 1990-1993 | 87-91019A2 | GM 502 V-8 | |
| MerCruiser | 500 BULLDOG | 4-Stroke | 1990-1996 | 87-91019A2 | GM 540 V-8 | |
| MerCruiser | 575 | 4-Stroke | 1986-1992 | 87-91019A2 | GM 540 V-8 | |
| MerCruiser | 600 SC | 4-Stroke | 1991-1996 | 87-91019A2 | GM 502 V-8 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Ignition Sensor Kit |
| Installation | Direct replacement |
| Housing Material | Glass-filled polyester |
| Connection | Lead wires with connectors |
| Maximum Supply Voltage | 12 Volts |
| Mounting Type | Flange Mount |
| Output Type | Electrical signal |
| Dimensions | 160 × 76 × 56 mm (6.3 × 2.99 × 2.2 inches) |
| Weight | 0.132 kg (4.66 ounces) |
| Other Technical Attributes | Designed for marine applications with corrosion resistance |
Package Contents
- 1 x Ignition Sensor
- 1 x Set of Lead Wires with Connectors
- 1 x Hardware Kit (mounting screws and fasteners)
Installation Guide
Follow these steps for a proper installation. Disconnect the boat's battery before starting work.
- Safety First: Ensure the engine is off and cool, and disconnect the battery's negative terminal.
- Locate the Sensor: Find the ignition sensor inside the distributor housing.
- Disconnect Wiring: Carefully unplug the electrical connectors from the old ignition sensor.
- Remove Old Sensor: Unscrew the mounting fasteners holding the old sensor in place and remove it from the distributor.
- Install New Sensor: Position the new ignition sensor and secure it using the new hardware provided in the kit.
- Connect New Wiring: Firmly attach the new lead wire connectors to the new sensor and the corresponding terminals.
- Final Checks: Reconnect the battery terminal, start the engine, and check for smooth operation and correct timing.
Troubleshooting & FAQ
How do I confirm this fits my MerCruiser engine?
This kit is designed for MerCruiser V6 and V8 engines (4.3L to 8.2L) from 1981-1997 with Thunderbolt IV & V ignition systems. Please check the 'Compatible Engine Models' and 'Part Number Cross-Reference' tables to ensure it matches your specific model and original part number.
What are the signs of a failing ignition sensor?
Common symptoms include engine misfires, stalling, difficulty starting, intermittent loss of power, or a complete failure to start. If you are experiencing these issues, your ignition sensor may need replacement.
My old part number is 87-91019A2, but the title references 87-91019A3. Will it fit?
Yes. Our kit replaces both OEM numbers, along with several others, as they are functionally interchangeable. You can verify all equivalent part numbers in our cross-reference table to confirm compatibility.
OEM vs. Aftermarket?
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.
How fast do you ship and how much does it cost?
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.
What is your warranty and return policy?
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.
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