Porsche Genuine Camshaft O-Ring/Throttle Body Base (73-83)

Burkken Auto Parts offers this Genuine Porsche camshaft O-ring and throttle body base seal for the Porsche 911 (1973-1983). Part number 999-701-124-40 is the precision-dimensioned O-ring used at the camshaft housing and throttle body base interface on CIS-equipped 911 engines. A deteriorated O-ring at this location allows air and oil leaks that directly affect the precision fuel metering of the Bosch CIS fuel injection system, causing rough idle, hesitation, and elevated oil consumption. Replace this seal whenever the throttle body or cam housing is disturbed.

Key Features

• Genuine Porsche OEM O-ring for camshaft housing and throttle body base, 911 (1973-1983)
• Precision-dimensioned for exact compression and sealing in the Porsche application
• Resists oil, fuel vapors, and heat cycling of the air-cooled engine environment
• Eliminates air leaks that cause idle instability on CIS-equipped 911 engines
• Replace any time the throttle body or cam housing is removed

Fitment

Porsche 911 (1973-1983) with CIS Bosch fuel injection or Zenith carburetors, throttle body and camshaft housing applications

Frequently Asked Questions

What does this O-ring seal on a Porsche 911?
Part number 999-701-124-40 seals the interface between the throttle body base and camshaft housing on 1973-1983 Porsche 911 engines. A correctly installed O-ring prevents air leaks that would upset the precise air metering of the Bosch CIS injection system, and prevents oil migration at the camshaft housing interface.

How do I know if this O-ring has failed on my 911SC or Carrera?
Signs of a failed throttle body base O-ring include unstable or erratic idle, a rough idle that cannot be corrected by standard idle adjustment, oil seepage at the throttle body base, and difficulty achieving correct CO and mixture settings during tuning.

Should I replace this O-ring every time I remove the throttle body?
Yes. O-rings should never be reused after removal. They take a permanent set from compression and heat, and reusing them risks an immediate leak on reinstallation. Given the very low cost of this seal, always fit a fresh O-ring during any throttle body or cam housing service.

Is this O-ring compatible with all 911SC and Carrera models from 1978-1983?
Part number 999-701-124-40 covers 1973-1983 911 applications including the 911SC (1978-1983). Always verify your specific engine year and configuration against the Porsche ETK before ordering, as O-ring dimensions vary by application.

What other seals should I replace at the same time?
When servicing the throttle body on a 1973-1983 911, also replace all throttle body gaskets, the idle bypass O-rings, and any other rubber seals disturbed during removal. A complete seal replacement ensures a fresh airtight baseline for tuning.

Why Buy from Burkken Auto Parts?

Burkken Auto Parts stocks the precise Genuine Porsche seals that CIS-equipped 911 owners need for correct engine function. Small seals with big consequences - we supply the right part at the guaranteed lowest price so you can tune your 911 with confidence.