811639T Aftermarket Mercruiser Ignition Module | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Delco Distributor Pickup Coil Sensor - Replaces Part Number: 811639T

New aftermarket distributor pickup sensor replacing MerCruiser 811639T. This is the internal magnetic pickup/trigger coil for Delco EST/HEI distributors, not the separate ignition-control module.

⚙️ Key Features

• Internal Delco distributor pickup sensor

• Generates the engine-position trigger signal

• Supports GM four-cylinder, V6 and V8 marine distributors

• Cross-references Volvo Penta/OMC 3854001

• Connects to the separate ignition module

🧰 Kit / Assembly Contents

• 1 × Distributor pickup-coil/sensor assembly - Part Number: 811639T

• 1 × Integrated sensor lead and connector - supplied with sensor P/N 811639T

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 811639T → Supersedes/cross-references 811639 and 802465

OEM / Related Numbers:

• 811639

• 802465

• 3854001

Aftermarket / Verified Equivalents:

• GLM: 72130

• Recmar: REC3854001

• Aftermarket Delco EST pickup-coil equivalents matched by distributor

🚤 Compatibility

Commonly used on:

• Delco EST/HEI marine distributors

Typically suits:

• Engine / Equipment models:

• GM 3.0L four-cylinder Delco EST

• GM 4.3L V6 Delco EST

• GM 5.0L, 5.7L, 7.4L and 8.2L V8 Delco EST applications

• HP / Output Range: Approximately 115HP - 425HP

• Engine / System Type: GM petrol marine engine with Delco distributor ignition

• Year Range: Model- and serial-dependent

• Serial / Component Identification: Confirm distributor internals and connector; the separate ignition module is 8M6008208/811637 family.

🔌 Function

The distributor pickup sensor detects shaft position and generates the timing signal used by the ignition module or engine-control unit. A clean, stable signal is required for correct coil switching and spark timing.

Common signs of failure / service requirement:

• Crank/no-start with no distributor trigger signal

• Intermittent stalling as the distributor heats up

• Erratic tachometer signal or unstable ignition timing

• Weak or irregular pickup-coil resistance/output

• Damaged wires, corroded terminals or reluctor contact

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging