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Clutch Ring Gear
By OE Match
- Porsche 911 1978-1989 3.3L Turbo (930)
Flywheel Ring Gear
Restore dependable starting performance to your classic
Porsche 911 Turbo with this OE Match Flywheel Ring Gear. Designed for Porsche 911 turbo (930) models produced
between 1978 and 1989, this precision-engineered ring gear provides the
critical interface between the starter motor and flywheel, ensuring reliable
engine cranking and smooth engagement during every start-up.
Fits:
- Porsche 911 1978-1989 3.3L Turbo (930)
Manufactured to OE specifications, this replacement ring gear is engineered to deliver exceptional durability and precise fitment for the demanding requirements of the turbocharged air-cooled flat-six engine. Whether you're rebuilding a transmission, replacing a worn flywheel component or carrying out a full engine restoration, this OE Match ring gear helps maintain reliable starting performance and long-term drivetrain integrity.
Technical Specifications
- Number of Teeth: 135
- Internal Diameter: 230mm
- External Diameter: 280mm
Quality Precision Machined Gear Teeth for Correct Starter Engagement
What Does the Flywheel Ring Gear Do?
The flywheel ring gear is mounted around the outer edge of the flywheel and serves as the engagement point for the starter motor pinion gear.
When the ignition is activated, the starter motor extends its pinion gear into the teeth of the flywheel ring gear. The starter then rotates the flywheel, which in turn rotates the crankshaft and starts the engine.
The flywheel ring gear performs several essential functions:
- Transfers rotational force from the starter motor to the engine.
- Allows the engine to crank during start-up.
- Provides precise engagement with the starter pinion gear.
- Supports smooth and reliable engine starting.
- Helps prevent starter slippage and gear damage.
On the turbocharged Porsche 930, where higher compression and engine loads place greater demands on the starting system, proper ring gear condition is especially important.
Why Do Flywheel Ring Gears Fail?
Although manufactured from hardened steel, flywheel ring gears endure repeated mechanical stress throughout their service life. Every engine start places load on the gear teeth, eventually leading to wear and damage.
Common causes of flywheel ring gear failure include:
- Tooth wear from repeated starter engagement.
- Chipped, cracked or broken gear teeth.
- Worn starter motor pinion gears.
- Starter motor misalignment.
- Corrosion caused by moisture exposure.
- Excessive heat from clutch or flywheel issues.
- High mileage and decades of use.
Many Porsche 930 models have now accumulated decades of service, making flywheel and starter system inspections increasingly important during restoration and maintenance work.
When Should the Flywheel Ring Gear Be Replaced?
The ring gear should be inspected whenever the clutch,
transmission or engine assembly is removed. Replacement is recommended if any
of the following are found:
- Worn or rounded gear teeth.
- Broken or chipped teeth.
- Starter grinding noises.
- Intermittent starter engagement.
- Difficulty cranking the engine.
- Visible corrosion or physical damage.
- Excessive wear concentrated in specific areas of the gear.
Because replacement requires flywheel removal, many specialists recommend fitting a new ring gear during clutch replacement or major drivetrain refurbishment when access is readily available.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93011623003
The product you are viewing cross references to these numbers
OEMatch Clutch Ring Gear — Engagement, Smoothness, Control
OEMatch Clutch Ring Gear for Porsche models. The clutch ring gear is the toothed outer rim fitted to the flywheel; it provides the interface for the starter motor and helps preserve rotational balance during cranking. Replacing a worn ring gear restores consistent engagement and reduces the likelihood of starter or flywheel damage. OEMatch supplies parts intended for Porsche maintenance and restoration.
Understanding OEMatch Clutch Ring GearOEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original clutch ring gear.
OE (Original Equipment) refers to parts matching original specifications for the clutch ring gear and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM clutch ring gear engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
The clutch ring gear forms part of the flywheel assembly and must present a correct tooth profile, concentric mounting and suitable balance; faults in any of these areas can impede starter engagement or cause vibration. Inspection during clutch or flywheel work commonly reveals wear, heat marks or tooth damage that indicate replacement is required.
- Restores reliable starter engagement and reduces grinding
- Protects the starter motor and flywheel from further damage
- Maintains flywheel balance to limit vibration and associated wear
- Worn or chipped teeth from repeated starter engagement
- Misalignment between the starter pinion and the ring gear
- Heat distortion, corrosion or material fatigue leading to cracking or loss of tooth profile
Replacing a damaged or worn ring gear during clutch or flywheel service reduces the risk of starter failure and avoids additional repair work; using a correctly sized and heat-treated replacement preserves balance and starting reliability. OEMatch Clutch Ring Gear components are compatible replacements engineered to original-spec dimensions and tolerances — a practical option when genuine or OEM parts are unavailable.
Advantages- Heat-treated steel construction for improved wear resistance
- Machined tooth profile for smooth starter engagement
- Coverage for a range of Porsche models and service needs
Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new bolts where specified;. If you are unsure of the correct procedure, seek professional fitting.
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