Sierra 18-5432 Rotor Assembly for MerCruiser 4.3L 262 cid V-6 Engines, Replaces Mercury Marine 13524A6

The Sierra 18-5432 Rotor Assembly is a distributor rotor built for MerCruiser inboard/outboard engines equipped with a contact-controlled distributor running standard rotation. It is designed for GM-based 262 cid V-6 MerCruiser powerheads across a range of model years and serial number ranges, including the 205, 4.3L (2bbl), 4.3L (2bbl) GEN+, 4.3L EFI (GEN+/TBI), 4.3LH (GEN+, 4bbl), 4.3LX (4bbl), 4.3LX (GEN+, 2bbl), and the 4.3L/LH/LX/LXH V6 Alpha (Gen+) and Bravo (Gen+) drive combinations. This rotor is intended for contact-controlled distributor ignition systems and is not designed for Thunderbolt ignition setups.

The rotor features a machined exterior finish and mounts inside the distributor cap, where it directs spark from the coil to the correct spark plug wire terminal as the distributor shaft rotates. It ships as a single rotor assembly (one unit per package) and is commonly replaced as part of a routine ignition tune-up alongside the distributor cap, contact set, coil, and spark plug wires. Sierra manufactures this part to meet or exceed the specification of the original equipment component it replaces, making it a straightforward direct-fit replacement for the applicable MerCruiser V-6 engines.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5432
• Product Type: Rotor Assembly
• Exterior Finish: Machined
• Distributor Type: Contact-controlled, standard rotation
• Ignition Compatibility: Not for Thunderbolt ignition systems
• Engine Type: GM 262 cid V-6, MerCruiser I/O
• Unit Count: 1
• Weight: 0.17 pounds
• UPC: 030999319319
• OEM Cross Reference: Mercury Marine 13524A6, 13524A4, 13524Q06, 19405A4, 90576A5; CDI E65-0004; GLM 71070; Mallory 9-29218

Fitment

• Model 205, 262 cid V-6, 1985-1987, Serial# A331455 - B775129
• Model 4.3L (2bbl), 262 cid V-6, 1988-1996, Serial# B773243 - F802999
• Model 4.3L (2bbl) GEN+, 262 cid V-6, 1998-2010, Serial# L010044 & UP
• Model 4.3L EFI (GEN+, TBI), 262 cid V-6, 1999-2001, Serial# L360000 - M299999
• Model 4.3LH (GEN+, 4bbl), 262 cid V-6, 1998-2002, Serial# L010044 - M614999
• Model 4.3LX (4bbl), 262 cid V-6, 1988-1996, Serial# B775130 - F802999
• Model 4.3LX (GEN+, 2bbl), 262 cid V-6, 1996-1997, Serial# F803000 - K999999
• Model 4.3L/LH/LX/LXH V6, Alpha (Gen+), 1996-2001, Serial# F803000 & UP
• Model 4.3L/LH/LX/LXH V6, Bravo (Gen+), 1996-2001, Serial# F803000 & UP

Replaces (OEM)

• Mercury Marine 13524A6
• Mercury Marine 13524A4
• Mercury Marine 13524Q06
• Mercury Marine 19405A4
• Mercury Marine 90576A5
• CDI E65-0004
• GLM 71070
• Mallory 9-29218

Frequently Asked Questions

What does the Sierra 18-5432 rotor fit? The 18-5432 rotor fits MerCruiser inboard/outboard engines with a 262 cid GM V-6 and a contact-controlled, standard-rotation distributor, covering models such as the 205, 4.3L (2bbl), 4.3L (2bbl) GEN+, 4.3L EFI (GEN+/TBI), 4.3LH (GEN+, 4bbl), 4.3LX (4bbl and GEN+/2bbl), and the 4.3L/LH/LX/LXH V6 Alpha (Gen+) and Bravo (Gen+) combinations, within the serial number ranges specified for each model.

Will this rotor work with a Thunderbolt ignition system? No. The 18-5432 rotor is built for contact-controlled distributors with standard rotation and is not intended for engines with Thunderbolt ignition.

What is the OEM equivalent of Sierra part 18-5432? Sierra 18-5432 is a direct cross-reference to Mercury Marine 13524A6, and it also interchanges with Mercury Marine 13524A4, 13524Q06, 19405A4, and 90576A5, as well as CDI E65-0004, GLM 71070, and Mallory 9-29218.

How much does the 18-5432 rotor weigh? The Sierra 18-5432 Rotor Assembly weighs 0.17 pounds.

How many rotors come in the package? One rotor assembly is included per package of Sierra part 18-5432.

What finish does the rotor have? Sierra 18-5432 has a machined exterior finish.

Is the 18-5432 rotor genuine Sierra or aftermarket? It is a genuine Sierra-manufactured part, built to meet or exceed the specification of the original equipment rotor it replaces rather than being a generic aftermarket copy.

When should I replace the distributor rotor on my MerCruiser engine? The rotor is typically replaced during a routine ignition tune-up along with the distributor cap, contact set, coil, and spark plug wires, or when ignition misfire symptoms point to worn distributor components.

Does the 18-5432 rotor fit both 2-barrel and 4-barrel 4.3L engines? Yes, within the applicable serial number ranges the 18-5432 rotor fits 4.3L (2bbl), 4.3LX (4bbl), 4.3LH (GEN+, 4bbl), and 4.3LX (GEN+, 2bbl) MerCruiser configurations, as well as 4.3L EFI (GEN+/TBI) engines.

Does this rotor fit Alpha and Bravo drive MerCruiser engines? Yes, the 18-5432 rotor is listed for the 4.3L/LH/LX/LXH V6 engine with both Alpha (Gen+) and Bravo (Gen+) drives, for serial numbers F803000 and up.

What is the UPC for Sierra 18-5432? The UPC for the Sierra 18-5432 Rotor Assembly is 030999319319.