393-9459Q1 Aftermarket Mercruiser 4-Cylinder Distributor Cap | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Four-Cylinder Delco Distributor Cap - Replaces Part Number: 393-9459Q1

New aftermarket conventional Delco distributor cap replacing MerCruiser 393-9459Q1 for early GM four-cylinder marine engines.

⚙️ Key Features

• Four-cylinder conventional Delco cap

• Supports 2.5L, 3.0L and 3.7L MerCruiser engines

• Marine-grade corrosion-resistant terminals

• Cross-references early OMC and Mercury cap numbers

• Not interchangeable with later 811635T3 Delco EST cap

🧰 Kit / Assembly Contents

• 1 × Four-cylinder distributor cap - Part Number: 393-9459Q1

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 393-9459Q1 → Supersedes/cross-references 393-9459, 393-9549T and 33667

• FI6900052 and OMC 380541 (cross-brand related references)

OEM / Related Numbers:

• 393-9459

• 393-9549T

• 33667

• FI6900052

• 380541

Aftermarket / Verified Equivalents:

• Sierra: 18-5385

• GLM: 71540

• Mallory: 9-29401

• CDI Electronics: E64-0002

🚤 Compatibility

Commonly used on:

• Early MerCruiser GM four-cylinder distributor ignition systems

Typically suits:

• Engine / Equipment models:

• 2.5L/120HP GM four-cylinder

• 3.0L/140HP GM four-cylinder

• 3.7L/470-family four-cylinder applications using the conventional Delco cap

• HP / Output Range: Approximately 120HP - 190HP

• Engine / System Type: GM inline four-cylinder petrol marine engine with conventional distributor

• Year Range: Approximately 1963 - 1989, depending on engine family

• Serial / Component Identification: Confirm conventional Delco cap shape; later EST distributors use 811635T3.

🔌 Function

The distributor cap contains the high-voltage terminals that route ignition-coil output to the correct spark-plug lead. It also insulates the terminals and rotor path from moisture, salt and arcing.

Common signs of failure / service requirement:

• Crossfire, backfiring or random-cylinder misfire

• Hard starting in damp or humid conditions

• Carbon tracking, burnt terminals or internal arcing

• Cracks, corrosion or green deposits inside the cap

• Rough idle and loss of power under acceleration

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging