RPS Ignition Coil for MerCruiser & Volvo Penta 3.0-8.2L — 12V Delco EST/HEI, Corrosion-Resistant

RPS Ignition Coil delivers high-voltage spark performance for GM-based marine engines, replacing common Mercury and Volvo Penta part numbers for dependable ignition.

Designed for a wide range of inboard and sterndrive engines, this 12V coil is built to fit GM-derived marine powerplants including MerCruiser, Volvo Penta, OMC and Crusader models. It’s engineered as a direct substitute for several OEM and aftermarket references, and tailored for ignition systems using Delco EST or HEI-type electronic timing. Heavy-gauge windings and corrosion-resistant materials help it tolerate the humid, salty environment found in marine applications.

Which engines and part numbers does this coil work with?

This RPS coil is compatible with many GM-based marine blocks and replaces multiple factory references so you can cross-check your old unit. It supports 3.0L through 8.2L applications commonly found in MerCruiser, Volvo Penta and related marques.

• Fits 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, 8.1L and 8.2L marine engines.
• Cross-references: Mercury 817378T and 898253T27.
• Also replaces Volvo Penta 3854002 and 3854002-7, Sierra 18-5443, Delco EST-compatible units.
• Suitable for OMC/Crusader replacements where the mounting and terminals match.

How does the RPS coil perform in marine environments?

Materials and construction are selected to resist corrosion and maintain consistent output despite moisture and vibration. The coil uses robust internal windings and a durable housing to provide stable high-voltage pulses under load.

• Heavy-duty windings designed for long service life in saltwater conditions.
• Brass terminal minimizes oxidation at key electrical contact points.
• Sturdy bracket mounting reduces movement and helps sustain connections.
• Meets or exceeds many original specifications for output and durability.

Will this coil fit my Delco EST or HEI ignition system?

This unit is intended for Delco EST and HEI-style electronic timing systems and connects using the standard 12V coil terminals. Confirm terminal layout and mounting hole spacing against your old coil for a direct fit.

• Designed for Delco EST/HEI ignition configurations.
• Standard 12V electrical connections and bracket holes for straightforward replacement.
• Compatible with common harnesses used on GM-based marine engines.
• Check original part cross-references listed above to verify compatibility.

How easy is installation and what should I check before fitting?

Installation is a simple swap when bracket spacing and terminal layout match your engine’s original coil. Always disconnect the battery, note wire locations, and inspect connectors for corrosion before mounting the new coil.

• Standard mounting holes allow bolt-on replacement in most applications.
• Includes brass terminal for secure spark wire connection.
• Verify compatibility with your engine’s ignition harness and Delco EST/HEI system first.
• Reconnect battery only after double-checking all wiring and fasteners.

Who is this for: Boaters, mechanics and marine technicians looking for a reliable, OEM-style replacement coil for GM-based marine engines will find the RPS Ignition Coil a practical choice. It’s aimed at anyone maintaining MerCruiser, Volvo Penta, OMC or Crusader powerplants who needs a durable coil that cross-references common Mercury and Volvo part numbers and is built to withstand marine conditions.