13524T1 Aftermarket Mercruiser Rotor Button | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement V8 Thunderbolt Distributor Rotor Assembly - Replaces Part Number: 13524T1

New aftermarket rotor assembly replacing MerCruiser 13524T1 for GM V8 engines fitted with Thunderbolt IV or Thunderbolt V ignition. It includes the V8 trigger wheel and matches the 805759Q01 distributor-cap family.

⚙️ Key Features

• Direct replacement for MerCruiser 13524T1

• V8-specific Thunderbolt IV/V rotor phasing

• Includes the indexed trigger wheel

• Suitable for small-block and big-block GM marine V8 engines

• Matches distributor cap 805759Q01/805759T1

🧰 Kit / Assembly Contents

• 1 × Distributor rotor - MerCruiser service P/N 13524A3

• 1 × Rotor trigger/index wheel - MerCruiser P/N 42862

• Rotor and wheel supplied together as assembly P/N 13524T1

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 13524T1 → Supersedes 13524A5, 13524A3 and 13524A1

• 19405A3 and 90576A2 (earlier related rotor references)

OEM / Related Numbers:

• 13524A1

• 13524A3

• 13524A5

• 19405A3

• 90576A2

• 42862

Aftermarket / Verified Equivalents:

• CDI Electronics: E65-0009

• Sierra: 18-5431

• GLM: 71080

• Mallory: 9-29200

• Recmar: REC13524T1

🚤 Compatibility

Commonly used on:

• MerCruiser GM V8 engines with Thunderbolt IV/V ignition

Typically suits:

• Engine / Equipment models:

• 5.0L/305 and 5.7L/350 small-block V8

• 7.4L/454 and 8.2L/502 big-block V8

• V8 applications using distributor cap 805759Q01

• HP / Output Range: Approximately 198HP - 500HP

• Engine / System Type: GM small-block or big-block V8 petrol marine engine with distributor ignition

• Year Range: Principally 1980s through early-2000s; serial-dependent

• Serial / Component Identification: Confirm the Thunderbolt V8 distributor; 502 cubic inches is 8.2L, not 6.2L.

🔌 Function

The distributor rotor transfers high-voltage ignition energy from the centre terminal of the distributor cap to each cylinder terminal in firing order. Correct rotor phasing and low electrical resistance are required for a strong, accurately timed spark.

Common signs of failure / service requirement:

• Misfire under load or at higher engine speed

• Hard starting or intermittent no-start

• Burnt, eroded or carbon-tracked rotor tip

• Weak or inconsistent spark at several cylinders

• Moisture damage, cracking or excessive distributor-shaft play

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging