Chain tensioner. Porsche 911 1984-89 / 964 Turbo  ❭  93010505803

Chain tensioner.
The timing chain tensioner applies consistent pressure to the timing chain, preventing it from developing slack or vibration as the engine runs. By keeping the chain tight, it helps maintain precise valve timing, which is essential for smooth combustion, engine efficiency, and long-term reliability.
Sold each, Fits Left or Right Side

Fits:
Porsche 911 3.2L 1984 - 1989
Porsche 930 Turbo 1984 - 1989
Porsche 964 Turbo 3.3L

Diagram ref no 10

•  Application: Timing chain tensioner - typically one per side of the engine (left and right) depending on the model and engine variant.
•  Function: Maintains proper timing chain tension
•  Benefits: Improves timing accuracy, reduces engine noise, prevents premature wear

Installed in the timing cover area, the tensioner operates off oil pressure and spring force to automatically adjust the chain’s tautness as engine speed and temperature vary. This prevents noise such as chain slap, reduces premature wear on timing components, and helps avoid timing misalignment - which, if left unchecked, can lead to poor engine performance or damage.

A properly functioning timing chain tensioner is essential for engine health and performance. When a tensioner weakens or fails:
• The timing chain can slacken or skip, leading to noisy operation and accelerated wear.
• Valve timing accuracy deteriorates, which can reduce power and fuel efficiency.
• In severe cases, timing chain misalignment can lead to internal engine damage.

Replacing a worn tensioner ensures that the timing system maintains correct chain tension - promoting smoother operation, better combustion control, and improved engine longevity.

Replace the timing chain tensioner if you notice:
• Rattling or clattering noises from the timing chain area
• Reduced engine performance or rough idle
• Timing codes or check engine light related to valve timing
• During engine rebuilds, timing chain replacement, or if the original tensioner shows signs of wear

Related reference numbers
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93010505803

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