Ignition Coil – Fits MerCruiser OMC Volvo Penta 3.0L 4.3L 5.0L 5.7L 7.4L (Replaces 898253T27, 817378T)
Ignition Coil – Fits MerCruiser OMC Volvo Penta 3.0L 4.3L 5.0L 5.7L 7.4L (Replaces 898253T27, 817378T) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Ignition Coil – Fits MerCruiser OMC Volvo Penta 3.0L 4.3L 5.0L 5.7L...
Ignition Coil – Fits MerCruiser OMC Volvo Penta 3.0L 4.3L 5.0L 5.7L 7.4L (Replaces 898253T27, 817378T) is backordered and will ship as soon as it is back in stock.
Product Details
This Ignition Coil – Fits MerCruiser OMC Volvo Penta 3.0L 4.3L 5.0L 5.7L 7.4L is designed for marine Delco EST ignition systems used across GM inline 4-cylinder, V6, and V8 applications. Compatible with a wide range of MerCruiser, OMC, Volvo Penta, and Crusader engines including 3.0L, 4.3L, 5.0L, 5.7L, and 7.4L displacements.
Directly replaces MerCruiser 898253T27 and 817378T, OMC 3854002, Volvo Penta 3854002-7, and Crusader 7243200.
- Designed with mounting holes for 1/4" bolts—larger bolts may require hole enlargement
- Suitable for 4, 6, and 8 cylinder marine engine configurations
- Works with Delco EST electronic ignition systems
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 898253T27 |
| MerCruiser | 817378T |
| OMC | 3854002 |
| Volvo Penta | 3854002-7 |
| Crusader | 7243200 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Displacement | Years | Notes |
|---|---|---|---|---|
| MerCruiser | 4.3L EFI 262 Mag (TBI) | 4.3L | 1996–1998 | |
| MerCruiser | 350 MAG Bravo MPI | 5.7L | ||
| MerCruiser | 350 MAG MPI MIE | 5.7L | ||
| MerCruiser | 350 MAG EFI SKI | 5.7L | ||
| MerCruiser | Black Scorpion | 5.7L | ||
| MerCruiser | Black Scorpion Ski | 5.7L | ||
| MerCruiser | 377 Scorpion MCM | 377 | ||
| MerCruiser | 377 Scorpion SKI | 377 | ||
| MerCruiser | 454 EFI | 7.4L | ||
| MerCruiser | 454 MAG | 7.4L | ||
| MerCruiser | 454 MPI | 7.4L | ||
| MerCruiser | 454 Horizon MIE | 7.4L | ||
| MerCruiser | 3.0L (181 ci) | 3.0L | GM inline 4-cylinder | |
| MerCruiser | 5.0L (305 ci) | 5.0L | GM V8 | |
| MerCruiser | 8.2L (502 ci) | 8.2L | GM V8 |
Technical Specs
- Application
- Marine Delco EST ignition systems
- Cylinder Configuration
- 4, 6, and 8 cylinder engines
- Engine Series
- GM Inline 4, V6, V8
- Mounting Hole Size
- 1/4" bolt diameter
- Compatible Displacements
- 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, 8.2L
What's in the Box
- 1 × Ignition Coil
Installation Notes
Important: This coil features mounting holes designed for 1/4" bolts. If your original coil uses larger mounting bolts, you will need to enlarge the mounting holes or select an alternate coil with larger pre-drilled holes. Always disconnect the battery negative terminal before beginning work. Remove the old ignition coil by disconnecting the electrical connectors and unbolting the mounting hardware. Transfer any necessary brackets or hardware to the new coil if applicable. Install the new coil in the reverse order, ensuring all electrical connections are secure and corrosion-free. Torque mounting bolts to manufacturer specifications and reconnect the battery.
Troubleshooting & FAQ
Will this coil fit my engine if the mounting bolt size is different?
This coil is designed for 1/4" mounting bolts. If your engine uses larger bolts, you may need to carefully enlarge the mounting holes with a drill or select a different coil designed for your bolt size.
What are the symptoms of a failing ignition coil?
Common signs include misfires, rough idling, loss of power, poor fuel economy, engine stalling, or difficulty starting. If your engine runs rough or lacks spark on one or more cylinders, the ignition coil may be the culprit.
How do I confirm this coil works with my Delco EST system?
Check that your engine uses a Delco EST (Electronic Spark Timing) distributor. This coil is designed specifically for GM-based marine engines with EST ignition and will not work with older points-based or CDI systems.
Can I use this on both carbureted and fuel-injected engines?
Yes, this coil is compatible with both carbureted and fuel-injected marine engines equipped with Delco EST ignition systems, including TBI, MPI, and EFI configurations.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
How often should an ignition coil be replaced?
Ignition coils typically last many years, but exposure to moisture, heat, and vibration in marine environments can shorten lifespan. Replace when symptoms of coil failure appear or during major engine service.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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