SKU: CW98939
UPC: 693006030197
MPN: DR004
The ARCO Marine Premium Replacement Rotor for Mercruiser Inboard Engines with TEI Ignition (MPN DR004) is a direct-fit OEM-specification component engineered for GM V8 marine powerplants running Mercruiser Thunderbolt Electronic Ignition systems. This rotor restores ignition firing precision on 5.0L, 5.7L, and 7.4L displacement marine engines, addressing the critical function of directing high-voltage spark to individual cylinders in correct firing sequence.
ARCO Marine's replacement rotor meets the exact dimensional and electrical specifications of original Mercruiser components (replacing OEM part numbers 13524A1, 13524A3, 13524A5, 13524T1, 19405A3, and 90576A2, plus equivalent Sierra rotors). The design maintains precise carbon contact and terminal geometry to ensure consistent spark delivery across the rpm range, critical for fuel efficiency and emissions control in modern marine engines. Salt-air corrosion resistance is inherent to marine-grade materials, essential for vessels operating in coastal or offshore environments where standard automotive components degrade rapidly.
This rotor serves boat owners, marine technicians, and operators of high-performance inboard vessels who require reliable ignition components for extended offshore operation. Routine rotor replacement every 3–5 years or 300+ operating hours prevents misfire, rough idle, and starting hesitation. The compact 4×3×5-inch profile and 0.2-pound weight enable quick installation without additional tools or modifications to existing distributor assemblies.
Marine engines demand ignition reliability that land-based applications rarely encounter; salt spray, vibration, and continuous duty cycles degrade standard components faster than in automotive use. ARCO's marine-specific rotor design and material chemistry address these environmental stressors directly, ensuring ignition performance remains consistent whether operating in freshwater lakes or open-ocean conditions.
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ARCO Marine
ARCO Marine
ARCO Marine
ARCO Marine
ARCO Marine