Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Camshaft Transmission
| Number | Designation | Number | Designation |
| 1 | Camshaft chain | 3 | Intermediate shaft |
| 2 | Auxiliary unit sprocket |
Both camshafts are driven by a camshaft chain, which in turn, is driven by the crankshaft via the intermediate shaft. The camshaft chain has inverted teeth, so called, "silent chain".
The chain drive is maintenance free.
The exhaust side's camshaft has a vibration damper, which guarantees optimum balance in the gear and chain sprockets.
Timing cover
| Number | Designation | Number | Designation |
| 1 | Chain guide | 5 | Coolant pump outlet |
| 2 | Induction camshaft | 6 | Hydraulic chain tensioner |
| 3 | Exhaust camshaft | 7 | Intermediate shaft |
| 4 | Coolant pump shell |
The timing cover is cast in aluminum.
The coolant pump shell is integrated in the timing cover. This saves weight. The coolant pump is still driven by the auxiliary unit's transmission.
The chain us tensioned by a hydraulic chain tensioner, which is located in the timing cover. Oil injection pipes supply the chain with oil.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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