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- 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 / GT3 RS 2007-09
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.
- 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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96411414331
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