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Clutch Ring Gear
By OE Match
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
Flywheel Ring Gear
Restore dependable engine starting performance with this OE
Match Flywheel Ring Gear, designed for Porsche 911 models produced between 1970 and 1986. The flywheel
ring gear is a critical component of the engine starting system, providing the
engagement surface for the starter motor and allowing the engine to crank
reliably every time the ignition is activated.
Fits:
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
Manufactured to OE specifications, this replacement ring gear delivers the correct tooth profile, fitment and durability required for classic air-cooled Porsche applications. Whether you're rebuilding an engine, replacing a worn flywheel component or restoring a classic 911, fitting a new flywheel ring gear helps ensure smooth starter operation and long-term reliability.
What Does the Flywheel Ring Gear Do?
The flywheel ring gear is a hardened steel gear mounted around the outer circumference of the flywheel. Its primary purpose is to engage with the starter motor pinion gear during engine start-up.
When the ignition key is turned, the starter motor extends its pinion gear into the teeth of the flywheel ring gear. The starter then rotates the flywheel, turning the engine over until combustion begins and the engine starts.
The flywheel ring gear plays a vital role by:
- Providing a durable engagement surface for the starter motor.
- Allowing the engine to crank during start-up.
- Ensuring smooth and reliable starter operation.
- Transferring rotational force from the starter motor to the crankshaft.
- Supporting consistent engine starting performance.
Without a properly functioning ring gear, starter engagement can become unreliable or impossible.
Why Do Flywheel Ring Gears Fail?
Although manufactured from hardened steel, flywheel ring gears experience repeated mechanical loading every time the vehicle is started. Over decades of service, wear and damage can occur.
Common causes of failure include:
- Tooth wear caused by repeated starter engagement.
- Damaged or chipped gear teeth.
- Starter motor misalignment.
- Worn starter pinion gears damaging the ring gear.
- Excessive heat generated during clutch or flywheel issues.
- Corrosion caused by moisture contamination.
- General wear associated with high mileage and age.
On classic Porsche 911 models, decades of repeated engine starts can eventually lead to worn sections of the ring gear, particularly in the areas where the engine most commonly stops after shutdown.
When Should the Flywheel Ring Gear Be Replaced?
The flywheel ring gear should be inspected whenever the
engine, clutch or flywheel assembly is removed. Replacement is recommended if
you observe:
Chipped,
broken or heavily worn teeth.
Replacing a worn ring gear while the transmission or engine is already removed can prevent future starting problems and reduce labour costs.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91111623904
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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