Clutch Ring Gear

Clutch ring gear.



Fits:
Porsche 964 RS 1992
Porsche 993 RS
Porsche 996 GT3, GT3 RS

Porsche 997 GT3RS

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96411414331

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Flywheel Ring Gear – Hardened Steel (OEM 964.114.143.31). This precision-machined hardened steel ring gear features starter-pinion teeth pressed onto the outer edge of a single-mass “RS” or lightweight flywheel. It’s the critical interface between the starter motor and the engine — the starter’s small pinion engages these teeth to crank the engine during start-up.

Technical Summary

• Function: Transfers starter motor rotation to the flywheel for engine cranking.
• Location: Pressed or shrink-fitted onto the outer diameter of the flywheel.
• Construction: Heat-treated, hardened steel with precision-machined teeth for maximum strength and wear resistance.
• OEM Part Number: 964.114.143.31 (also listed as 96411414331).
• Applications: Designed for RS, single-mass, or lightweight flywheels used in various Porsche 964 and 993 models, and select 996/997 GT3 and GT2 variants. Not compatible with dual-mass flywheels.

Fits:

• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 993 (911) RS 1994-97
• Porsche 996 GT3 MKI 1999-02
• Porsche 996 GT3 MKII 2003>>
• Porsche 996 GT3 RS 2003-04
• Porsche 997 MK1 GT3 2007-09  

Why You Should Replace Your Ring Gear

1. Damaged or Missing Teeth

Grinding, rough engagement, or failed starts often result from chipped, flattened, or missing teeth on the ring gear. When the teeth are damaged, the starter pinion can’t engage properly, leading to grinding or slipping during start-up.

2. Wear, Pitting, or Corrosion

Over time, surface wear, rust, or pitting can develop due to age or moisture exposure. These issues reduce engagement quality and increase wear on both the starter and ring gear.

3. Loose or Shifted Ring Gear

Although ring gears are press-fitted, heat cycles or improper installation can cause them to loosen or shift. A loose ring gear creates noise, accelerates wear, and poses a potential safety hazard.

4. During Flywheel or Clutch Service

Whenever the flywheel is removed for clutch replacement or resurfacing, it’s best practice to inspect the ring gear closely. Replace it if you find any damage or wear—it’s far cheaper than removing the transmission again later.

5. Starter or Pinion Replacement or Upgrades

If you’re installing a new or upgraded starter—or have had a starter failure that damaged the pinion—inspect and replace the ring gear at the same time to ensure proper engagement and reliable operation.

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96411414331

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Ring Gear.
The OE Match Ring Gear is a high-quality replacement drivetrain component designed to work as part of the engine starting system. Manufactured to OE specifications for fit, strength and durability, the ring gear is mounted to the flywheel or flexplate and provides the engagement surface for the starter motor pinion gear during engine start-up. 

Fits: 

• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C4 1989-93  

Precision-machined from hardened steel, the ring gear is engineered to withstand repeated engagement loads and high torque forces generated during engine cranking. Accurate tooth geometry ensures smooth starter engagement, reliable engine starting and long service life under demanding operating conditions.  

What This Product Does:

• Provides the engagement surface for the starter motor pinion gear.
• Transfers rotational force from the starter motor to the engine.
• Enables reliable engine cranking and starting.
• Works in conjunction with the flywheel or flexplate assembly.
• Ensures smooth engagement during start-up.
• Supports consistent operation of the starting system.
• Contributes to dependable vehicle reliability.

Symptoms Of Wear Or Failure:

• Grinding noises during engine starting.
• Starter motor spinning without turning the engine.
• Intermittent starting problems.
• Clicking noises during starter engagement.
• Starter motor slipping during cranking.
• Visible chipped, worn or missing teeth on inspection.
• Engine only starting when stopped in certain positions.
• Premature wear of the starter motor pinion gear.

Why Replacement Matters:

• The ring gear is subjected to repeated high-torque engagement every time the engine is started. Over time, the teeth can become worn, chipped, rounded or damaged, particularly in vehicles with high mileage or faulty starter motors. Excessive wear can prevent the starter pinion from engaging correctly, resulting in unreliable starting performance.
• A damaged ring gear can place additional strain on the starter motor, accelerating wear of both components and potentially leading to complete starting system failure. If left unresolved, the vehicle may become difficult or impossible to start, resulting in inconvenience and costly repairs.
• Replacing a worn ring gear restores proper starter engagement, improves starting reliability and helps protect the starter motor from unnecessary wear. An OE Match replacement provides factory-style fitment, precision machining and long-term durability, ensuring dependable starting performance and preserving the reliability of your Porsche.

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95011614305

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