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Clutch flywheel. Porsche 911 1984 - 1986 - 93010203301
93010203301/1
Vehicle Group
- Porsche 911 1984-1986 3.2L
Information
This flywheel fit the 1984–1986 Porsche 911 (3.2 L / Motronic engines) using the 915 transmission.
Fits:
Porsche 911 3.2L 1984 - 1986 (915 Gearbox)
Diagram ref no 3
The clutch flywheel purpose & function
A flywheel in general (for a manual-transmission car) has several critical roles:
• Mass / inertia storage — It smooths out the pulses of the engine, aiding when cylinders fire and bridging the gaps between combustion events.
• Clutch friction surface — The clutch disc presses against the flywheel, so the flywheel must have a suitable, stable friction surface.
• Crank / sensor interface — In this case, because it is used with Motronic control, the flywheel provides trigger pulses (teeth or marks) used by the engine control (DME) to know crankshaft position or engine speed.
• Balancing — It must be precisely balanced (often as part of the entire rotating assembly including crank, flywheel, clutch) to avoid vibration and stresses. If the flywheel is worn, warped, cracked, or misaligned, all of these functions are jeopardized (vibrations, clutch slippage, sensor error, etc.).
Common failure modes / why / signs & symptoms
Because the flywheel is a high-stress rotating component, over time or under strain it is subject to wear, damage and failure. For this particular part and era, here are common issues:
• Surface wear, scoring, glazing, heat spots on the friction surface: repeated clutch engagement or slipping can overheat zones, creating hard “spots” or cracks.
• Cracks / fractures: under severe stress or impact, cracks can develop, especially around bolt holes or near sensor teeth.
• Distortion (warpage): heat cycles may warp the flywheel face so it is no longer flat, causing uneven clutch engagement or chatter.
• Sensor trigger damage: damage or wear to the trigger teeth or notches may make the engine control module misread crank position or lost signals.
• Bolt failures / loosening: the 9 bolts attaching the flywheel to the crank are critical; if they stretch, loosen, or fail, misalignment or imbalance can result.
• Imbalance / degradation of balancing: over time, if the mating surfaces or mountings shift or fatigue, the initial balance may be compromised, introducing vibration.
• Oil contamination: if the rear main seal or other seals leak oil onto the friction surface, the clutch/flywheel interface becomes compromised (slippage, glazing).
• Fatigue / wear of dowel pins or alignment features: if alignment dowels (or roll pins) degrade or are missing, mounting may be off, leading to misalignment. In a forum thread, a user found small roll pins (alignment inserts) that had come off the flywheel.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010203301
The product you are viewing cross references to these numbers
Fits:
Porsche 911 3.2L 1984 - 1986 (915 Gearbox)
Diagram ref no 3
The clutch flywheel purpose & function
A flywheel in general (for a manual-transmission car) has several critical roles:
• Mass / inertia storage — It smooths out the pulses of the engine, aiding when cylinders fire and bridging the gaps between combustion events.
• Clutch friction surface — The clutch disc presses against the flywheel, so the flywheel must have a suitable, stable friction surface.
• Crank / sensor interface — In this case, because it is used with Motronic control, the flywheel provides trigger pulses (teeth or marks) used by the engine control (DME) to know crankshaft position or engine speed.
• Balancing — It must be precisely balanced (often as part of the entire rotating assembly including crank, flywheel, clutch) to avoid vibration and stresses. If the flywheel is worn, warped, cracked, or misaligned, all of these functions are jeopardized (vibrations, clutch slippage, sensor error, etc.).
Common failure modes / why / signs & symptoms
Because the flywheel is a high-stress rotating component, over time or under strain it is subject to wear, damage and failure. For this particular part and era, here are common issues:
• Surface wear, scoring, glazing, heat spots on the friction surface: repeated clutch engagement or slipping can overheat zones, creating hard “spots” or cracks.
• Cracks / fractures: under severe stress or impact, cracks can develop, especially around bolt holes or near sensor teeth.
• Distortion (warpage): heat cycles may warp the flywheel face so it is no longer flat, causing uneven clutch engagement or chatter.
• Sensor trigger damage: damage or wear to the trigger teeth or notches may make the engine control module misread crank position or lost signals.
• Bolt failures / loosening: the 9 bolts attaching the flywheel to the crank are critical; if they stretch, loosen, or fail, misalignment or imbalance can result.
• Imbalance / degradation of balancing: over time, if the mating surfaces or mountings shift or fatigue, the initial balance may be compromised, introducing vibration.
• Oil contamination: if the rear main seal or other seals leak oil onto the friction surface, the clutch/flywheel interface becomes compromised (slippage, glazing).
• Fatigue / wear of dowel pins or alignment features: if alignment dowels (or roll pins) degrade or are missing, mounting may be off, leading to misalignment. In a forum thread, a user found small roll pins (alignment inserts) that had come off the flywheel.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010203301
93010203301
The product you are viewing cross references to these numbers
Price: £299.00
In stock