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This genuine OEM slide/guide rail is a critical component of the timing chain drive system for select Porsche models 911 991.2, 992.1, 992.2, 718 Boxster/Cayman 982. It ensures the timing chain tracks correctly, maintains proper tension, and prevents chain deflection or wear. Ideal when servicing the timing chain system or responding to noise/chain wear symptoms.
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Fits:
- Porsche Boxster 718 2.0L Manual (300 Bhp)
- Porsche Boxster 718 2.0L PDK (300 Bhp)
- Porsche Boxster S 718 2.5L Manual (350 Bhp)
- Porsche Boxster S 718 2.5L PDK (350 Bhp)
- Porsche Boxster T 718 2.0L Manual (300 Bhp)
- Porsche Boxster T 718 2.0L PDK (300 Bhp)
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- Porsche Boxster GTS 718 2.5L PDK (365 Bhp)
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- Porsche Boxster GTS 718 4.0L PDK (400 Bhp)
- Porsche Boxster Spyder 718 4.0L (420 Bhp)
- Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp)
- Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp)
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- Porsche 991.2 Carrera 2S 3.0L (420 Bhp) 2016-19
- Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 4S 3.0L (420 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2S 3.0L (420 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4S 3.0L (420 Bhp) 2016-19
- Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Targa 4S 3.0L (420 Bhp) 2016-19
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- Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
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Diagram Ref No 5
What This Product Does:
- In a timing‐chain drive system (crankshaft → intermediate shaft → camshafts), there are guides/rails that the chain runs on. These guides keep the chain aligned, reduce vibration or deflection, and support tensioners in maintaining correct chain tension.
- The slide rail is one of these guiding components — it provides a smooth surface and correct route for the chain, and helps ensure the chain remains properly engaged with sprockets and tensioners.
- If the slide rail is worn, cracked or damaged, the chain may run with slack, contact adjacent components, produce noise, or even skip/skip-tooth under stress — which affects timing and can lead to engine damage.
When You Should Consider Replacement:
- You are already servicing the timing chain system (timing cover off, chain/guide/tensioner replacement) — since access is already required, replacing the guide rail is cost‐effective and prevents future access.
- You hear rattling or a clattering noise from the front of the engine (timing cover area) on cold start or idle, which can indicate chain deflection or guide wear.
- You have diagnostic codes relating to camshaft or intermediate shaft timing variations — a damaged or worn guide can cause chain timing to vary.
- Visual inspection (if cover removed) shows the guide rail is cracked, has excessive wear, gouges, or the chain has worn a groove in the rail.
- The vehicle has high mileage and the engine is performance-oriented — these guides can be wearing items and proactively replacing them improves long-term reliability.
Why Replacement Matters:
- Maintain timing accuracy & reliability: If the chain runs on a compromised guide, chain slack or mis-tracking can occur — which leads to timing drift, loss of power, or in worst cases, engine damage.
- Eliminate noise and improve smoothness: Worn guides allow chain slap, noise during engine operation, or rougher operation — replacing the slide rail restores proper chain path and quietness.
- Prevent escalated failure: A damaged guide could allow the chain to skip or jump, which on high-performance Porsche engines can mean valve-to-piston interaction and major damage.
- Efficient service: Since replacing a guide rail often requires similar labour as chain/tensioner replacement, doing it while the engine is opened saves future labour and increases reliability.
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0PB109513B
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