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Porsche > Cayman 718C (982C) 2017>> > Cayman GTS 718 4.0L PDK (400 Bhp) > Engine Rebuild Parts > Camshaft gears / sprockets and fixings >

Timing Chain Sprocket For Intermediate Shaft. Porsche 911 / 912 1965-69  ❭  90110501312

Timing Chain Sprocket For Intermediate Shaft. Porsche 911 / 912 1965-69 - 90110501312
4
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90110501312/1
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Product Information
Timing Chain Sprocket For Intermediate Shaft.
Restore the precision of your Porsche flat-six engine’s timing chain drive with this sprocket or intermediate shaft gear. Designed for Porsche 911/912 (verify engine code and part number), this sprocket mounts on the intermediate shaft and works in conjunction with the timing chain to drive the camshafts and maintain correct valve timing.

Fits:
  • Porsche 911 1965-1968 2.0L / 912 SWB (F)

Fits On To Diagram Ref No 43

What This Product Does:

  • The timing chain sprocket mounted on the intermediate shaft enables the correct transfer of rotational motion from the crank and timing chain to the camshaft drive or auxiliary drive components. In essence, it ensures proper timing of the valve train.
  • The intermediate shaft (IMS) inside many Porsche air-cooled flat-six engines sits between the crankshaft and camshafts; the sprocket is part of that chain/gear drive mechanism. If the sprocket is worn, mis-dimensioned or damaged, then the timing chain may skip or the cam timing may drift.
  • Because this component sits within the timing chain gear housing, correct fitment, tooth profile, heat-treatment, alignment and material spec matter a lot for high RPM reliability.

Symptoms & Signs You Might Need Replacement:
  • Timing chain noise: rattling, clatter or audible chain slap in the timing chain housing, especially after startup or under load — this may indicate the sprocket tooth profile or mounting is compromised.
  • Warning lights or mis-firing: If engine timing is off, cylinder performance may suffer, you might get rough running, mis-fires, or even engine damage.
  • Wear/physical damage: On inspection of the sprocket, if tooth faces are chipped, worn, suspiciously polished, or suspect in dimension, replacement is required.
  • During engine rebuild: If you are opening the timing chain case (IMS housing) or rebuilding the engine, it is good practice to replace the sprocket while access is open — because even if it looks OK, it’s a high-stress part and cheap insurance compared to major failure.
  • High mileage or vintage engine: Because wear accumulates over decades, even if performance seems OK you might choose proactive replacement to avoid future major engine work.

Why Replacement Matters:
  • Engine timing integrity: The sprocket is a critical part of the chain drive that controls valve timing. A damaged sprocket could result in chain jump, incorrect cam timing, possible valve‐to‐piston contact or catastrophic failure.
  • Longevity and reliability: Since this part operates hidden within the timing cover, failure often means heavy labour (engine out or major removal). Getting it right the first time reduces risk of future repair.
  • Economical preventive maintenance: While replacing a sprocket adds cost at rebuild time, it’s far less expensive than engine damage that might result from a worn or failing sprocket – so replacing proactively is a wise choice.



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Diagram ref no 8




Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

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