Standard Ignition GB-346 Distributor Rotor

Distributor Rotor for Mercedes-Benz V8 and V12 Applications

Standard Ignition GB-346 is a distributor rotor built for select Mercedes-Benz ignition systems from the mid-1980s through 1991. It uses a push-on mount, a brass contact material, and a phenolic rotor body with a red finish for straightforward service replacement.

Key Features

• Distributor rotor for ignition distributor and magneto service
• Push-on mount for direct installation on the distributor shaft
• Brass contact material for consistent electrical transfer
• Phenolic rotor material for ignition system durability
• Red finish for easy visual identification during maintenance
• Standard Ignition GB-346 replacement part number

Detailed Description

This Standard Ignition distributor rotor is specified for Mercedes-Benz 420SEL, 560SEC, 560SEL, and 560SL applications covering 1986-1991 model years. It is a direct-fit ignition service part for distributor maintenance on these vehicles, including Mercedes-Benz 560SL distributor rotor replacement and Mercedes-Benz 560SEL ignition rotor service. The GB-346 uses brass contacts to carry ignition current and a phenolic rotor body to support stable operation inside the distributor housing. This part cross-references D655 and RB965 for the same application.

What It Helps Address

• Engine misfire caused by worn rotor contacts
• Hard starting related to weak distributor spark transfer
• Intermittent ignition performance from heat-aged rotor material
• Rough idle linked to distributor wear
• Service replacement for cracked or carbon-tracked rotor components

Installation Notes and Tips

Install the rotor on the distributor shaft using the push-on mount and verify full seating before reassembly. Inspect the distributor cap, terminals, and ignition wires at the same time, since worn companion parts can affect spark delivery. Confirm vehicle application by year and model before ordering; this part is listed for 1986-1991 Mercedes-Benz 420SEL, 560SEC, and 560SEL, plus 1986-1989 Mercedes-Benz 560SL.

Quality Assurance

Standard Ignition supplies ignition service parts for professional repair use, and GB-346 is built to match the listed distributor rotor application requirements for these Mercedes-Benz models.