2.0t TSI Timing Chain Component Diagram
The quick reference guide above is to help anyone working with a TSI timing chain setup, easily identify the parts they need. This would apply to almost all TSI engines, with engine codes CCTA, CBFA and CAEB. While there may be slight variation in the parts on these motors, the larger majority of them are the same.
This timing chain is the longest chain in the group, and runs on both cam shafts then down to the crankshaft drive gear. This chain has copper colored links that are timing marks, which line of with timing marks on the camshafts and crank gear. Due to stretching issues this chain was revised with a newer version. More details on TSI Chain Stretching and How to Check (Video)
This chain guide is found on the rear of the engine, below the exhaust cam. This guide is also push by the timing chain tensioner to keep tension on the upper timing chain.
This bolt is used on the 2 tensioner guides in this system (#2 and #6). This bolt serves as a pivot point as the guides they mount hold tension on their associated timing chains.
This tensioner is the failure prone version, which was later updated. This part uses a ratcheting mechanism as well as oil pressure to keep tension on this chain. More Details, and how to check this TSI Tensioner (Video)
5. Tensioner Bolt for Lower Chain (Balance Shaft Chain)
This tensioner bolt uses a spring combined with oil pressure to keep tension on the timing chain that drives the balance shafts. It is important to note that this part should be primed with oil, to squeeze out any air when a new part is installed.
This lower guide is pressed by the lower tensioner bolt, and keeps the balance shaft chaiin tight during engine operation. This guide uses the same mounting bolt shown as #3 above.
7. Lower Chain Guide (2 Versions)
This is the upper guide for the lower (balance shaft) timing chain. This part varies by vehicle and requires the vin for us to verify which one your vehicle has in it.
This lower timing gear drives all timing chains in the system. This uses a specific keyed tooth pattern to match up with the crankshaft of the TSI engine. It is advised to use the lower timing tool spacer to prevent this gear from moving when working with the timing chains of the TSI engine.
This bolt mounts the lower timing gear to the crank shaft. This bolt requires extremly high torque and should be replaced whenever removed. To properly tighten this bolt you will need the special crank counter hold tool T10355.
10. Oil Pump Chain
This chain runs from the crank gear to the oil pump. We do not include this chain in our kits, due to cost. This chain is not under much stress relative to the other chains and is unlikely to have stretch or failure issues.
11. Oil Pump Chain Tensioner and Guide
- Oil Pump Chain Tensioner (early models) contact us with vin if needed
- Oil Pump Chain Tensioner (late models) contact us with vin if needed
This guide uses a spring to keep tension on the oil pump chain. Due to the low amount of force required for this, oil pressure is not used to keep tension on this, as it is with the other chains in the system.
This lower timing chain guide is fixed and helps guide the balance shaft chain during engine operation.
This lower timing chain is driven by the crank gear and drives both balance shafts. While this chain is less likely to stretch than the upper one, we have seen failures of these which is why we recommend replacing if you are doing anything related to chains. Due to stretching issues this chain was revised with a newer version. More details on TSI Chain Stretching and How to Check (Video)
This lower guide bolt is used in 6 places on the fixed (non tensioning) timing chain guides. This bolt would be used for mounting number 7, 12, and 17.
Balance shafts assist in keeping your engine running smooth. While there are instances of these failing, this is not exceptionally common. Due to the cost of these items we do not include them in any of our timing chain related kits.
This upper guide bolt is used in 6 places on the fixed (non tensioning) timing chain guides. This bolt would be used for mounting number 7, 12, and 17.
This chain guide is found on the front of the engine, below the intake cam. This guide is fixed and is used to keep the upper timing chain in place during operation of the engine.
The intake camshaft on the TSI engine is hollow to allow oil flow through for the variable valve timing control. The cam adjuster/gear at the end of this camshaft is not sold individually, and can only be purchased with the complete camshaft.
19. Variable Valve Timing Control Valve
This valve controls the oil flow to the cam adjuster. There are different valves for different engines. A poorly maintained vehicle may be more likley to have a poor operating control valve lack of oil changes.
This upper timing chain guide is located above the camshafts and keeps the upper chain in place during engine operation.