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Porsche
Upgrade or restore critical engine hardware on your Porsche 911 (997-series) with this genuine OEM bolt with washer. Designed for the crankshaft assembly on M97.01 engines, this fastener ensures correct clamping, correct load distribution and secure attachment.
Fits:
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Diagram Ref No 31
What This Product Does:
- This bolt with integrated washer (combination screw) clamps the crankshaft/flywheel assembly to the engine block or connection plate, allowing torque transmission from the engine.
- Because it's in a high-load, rotating, high-temperature environment, the bolt must maintain specification: correct size, correct material strength, proper washer preload, and correct torque/installation.
- The washer portion helps distribute clamping load and prevent loosening under vibration and rotational forces.
- If this bolt fails, loosens or is incorrect, it could lead to flywheel/shaft movement, mis-alignment, major engine damage or catastrophic failure.
When You Might Need Replacement:
- You are removing the crankshaft, flywheel, or performing engine teardown/major service.
- The bolt appears corroded, damaged, stretched, or shows evidence of prior over-torque or reuse beyond specification.
- The washer portion is deformed, missing, or not the correct factory spec.
- You’re assembling a high-performance or rebuilt engine and want to ensure all critical bolts meet original Porsche specification rather than reuse old hardware.
Why Replacement Matters:
- Engine safety & reliability: Securing the crankshaft/flywheel area is essential for the engine’s mechanical health. A compromised bolt here can lead to misalignment, vibration, failure of bearings, or worse.
- Maintaining OEM integrity: Using the correct Porsche part (99710220200) ensures correct dimensions, material, washer design, and correct preload/torque spec.
- Avoiding long-term risk: Because this bolt operates in a high-stress rotating environment, replacing it when doing major work means you don’t risk future failure or damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710220200
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
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12 Month Warranty
Worldwide Delivery
100 Plasigauge strips per box
PLASTIGAUGE PL-A is widely used in the measurement of clearance in plain automotive bearings. Measurement of clearance in big-end bearings can be achieved without dismantling the crankshaft.
For measurements of: 0.001″ to 0.007″ (0.025mm – 0.175mm)
Suitable for use at temperatures between 0°C and 35°C
Contents:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PLA007
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12 Month Warranty
Worldwide Delivery
3G Mineral Grease: To coat journal prior to use of Plastigauge
3G Silicone Grease: To apply to surface of shell
Lubricants to assist with the measurement of clearance in automotive bearings.
Plastigauge Precision Clearance Gauges
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12 Month Warranty
Worldwide Delivery
Kit includes:
1 x Plastigauge PL-A box
1 x Plastiguage Mineral grease
1 x Plastiguage Silicone grease
PLASTIGAUGE PL-A is widely used in the measurement of clearance in plain automotive bearings. Measurement of clearance in big-end bearings can be achieved without dismantling the crankshaft.
3G Minerak Grease: To coat journal prior to use of Plastigauge
3G Silicone Grease: To apply to surface of shell
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PLASKIT
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