Aftermarket Ignition Sensor Kit for MerCruiser Thunderbolt IV & V V6/V8 Engines – Replaces 87-892150Q02 and 87-91019A3
Aftermarket Ignition Sensor Kit for MerCruiser Thunderbolt IV & V V6/V8 Engines – Replaces 87-892150Q02 and 87-91019A3 is backordered and will ship as soon as it is back in stock.
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Aftermarket Ignition Sensor Kit for MerCruiser Thunderbolt IV &...
Aftermarket Ignition Sensor Kit for MerCruiser Thunderbolt IV & V V6/V8 Engines – Replaces 87-892150Q02 and 87-91019A3 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket ignition sensor kit is intended for selected MerCruiser V6 and V8 marine engines equipped with Thunderbolt IV or Thunderbolt V electronic ignition systems. It is listed as a replacement for several Mercury/MerCruiser and aftermarket reference numbers, including 87-892150Q02 and 87-91019A3. Always compare the original sensor, connector configuration, mounting arrangement, engine model, and ignition system before ordering.
The sensor is designed for marine ignition applications and may be used on selected 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L MerCruiser applications. Compatibility depends on the exact engine model, production year, ignition system, and existing distributor configuration.
- Designed as a replacement ignition sensor for selected MerCruiser Thunderbolt IV and Thunderbolt V systems.
- Glass-filled polyester housing for durability in marine applications.
- Includes lead wires and mounting hardware as listed in the package contents below.
- Verify the original part and connector arrangement before installation.
Part Number Matrix
The following numbers are reference applications associated with this replacement sensor. They should be used together with visual, dimensional, connector, and application verification.
| 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 |
Engine & Model Compatibility
The applications below are reference coverage for selected MerCruiser engines. Confirm the exact model, year, ignition system, distributor, connector, and original part number before purchase. Number co-occurrence alone does not confirm fitment for every engine in a model family.
| 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; verify ignition configuration |
| MerCruiser | 4.3LX (4 BBL.) | 205 | 4-Stroke | 1987–1992 | 87-91019A2 | GM 262 V-6; verify ignition configuration |
| MerCruiser | 5.0L (4 BBL.) | 200–230 | 4-Stroke | 1981–1995 | 87-91019A2 | GM 305 V-8; verify ignition configuration |
| MerCruiser | 5.7L | 260–350 | 4-Stroke | 1986–1995 | 87-91019A2 | GM 350 V-8; verify ignition configuration |
| MerCruiser | 7.4L | 320–425 | 4-Stroke | 1981–1996 | 87-91019A2 | GM 454 V-8; verify ignition configuration |
| MerCruiser | 8.2L | 425–500 | 4-Stroke | 1990–1996 | 87-91019A2 | GM 502 V-8; verify ignition configuration |
Technical Specs
- Product Type
- Ignition sensor kit
- Application
- Selected MerCruiser Thunderbolt IV and Thunderbolt V ignition systems
- Installation
- Replacement installation; confirm mounting and connector compatibility first
- 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 ignition applications with corrosion-resistant construction
What’s in the Box
- 1 × Ignition sensor
- 1 × Set of lead wires with connectors
- 1 × Hardware kit with mounting screws and fasteners
Installation Notes
- Disconnect the negative battery terminal before beginning work.
- Locate and carefully remove the distributor cap and rotor to access the ignition sensor.
- Record the routing of the original sensor wires, then disconnect them.
- Remove the fasteners and take out the old ignition sensor from the distributor housing.
- Position the replacement sensor correctly and secure it with the supplied or original fasteners as appropriate.
- Route and connect the lead wires in the same manner as the original wiring, keeping them clear of moving or hot components.
- Reinstall the distributor rotor and cap.
- Reconnect the negative battery terminal and test the engine for proper starting, idle, and running operation.
Installation should be performed by a qualified marine technician when the ignition configuration or replacement procedure is uncertain.
Troubleshooting & FAQ
How do I know if my ignition sensor is failing?
Possible symptoms include misfiring, erratic tachometer behavior, stalling, hard starting, intermittent operation, or loss of spark. These symptoms can also be caused by the ignition coil, distributor cap, rotor, wiring, power supply, or other ignition components, so testing is recommended before replacement.
Is this compatible with both Thunderbolt IV and V systems?
This replacement is intended for selected MerCruiser Thunderbolt IV and Thunderbolt V applications. Confirm the exact engine, distributor, connector, mounting arrangement, and original part number before ordering; not every Thunderbolt IV or V system uses the same sensor.
What is the difference between 87-91019A3 and 87-892150Q02?
These are Mercury/MerCruiser reference numbers associated with ignition sensor applications. Supersession and interchange can vary by engine and ignition configuration, so compare the complete application details rather than relying on the number alone.
Will this fix a “no spark” issue?
A failed ignition sensor can contribute to a no-spark condition, but the ignition coil, distributor cap, rotor, wiring, battery supply, control module, and other components may produce similar symptoms. Diagnose the ignition system before replacing parts.
What is the recommended replacement interval?
There is no universal scheduled replacement interval stated for this sensor. Inspect and test it when symptoms occur or during ignition-system service, and replace it when testing identifies a failure or when the component is damaged.
Is this an OEM component?
No. This listing is for an aftermarket replacement sensor kit. Mercury, MerCruiser, Sierra, Mallory, CDI, and GLM names and part numbers are used only as application or reference identifiers where shown.
What should I verify before ordering?
Verify the engine model, year, horsepower, stroke, Thunderbolt system, distributor configuration, connector style, mounting arrangement, dimensions, and original reference number. If any of these differ from the listing, contact a qualified marine parts specialist before purchase.
Safety & Important Information
- Disconnect the battery before servicing the ignition system.
- Verify the original component, connector, dimensions, and specifications against this listing before purchase.
- Do not rely on engine displacement or a part number alone to establish compatibility.
- This is an aftermarket replacement, not an OEM component.
- Professional marine installation is recommended when the correct ignition configuration or wiring procedure is uncertain.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for selected marine applications.
- Application-Focused Information — Use the model, year, ignition-system, and reference-number details to confirm compatibility.
- Support — Contact support with your engine model, serial information, original part number, and photos when application assistance is needed.
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