- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
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Related, superseded, cross reference or alternative numbers for comparison.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
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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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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
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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This kit is comprised of the following items: