Camshaft Tensioners - Alfa Romeo 159 Training Material

ENGINE
Important:
Timing cannot be checked during the references once the engine has been timed after the crankshaft has turned
once.
TIMING INSPECTION: with fourth cylinder at TDC. The camshaft pulleys must be positioned with a specific tool. The
markings on the torsional vibration damper and the timing box must be aligned in this position.

Camshaft tensioners

LOCATION: The two hydraulic chain tensioners are arranged:
in the head (crankshaft drive chain)
timing box (countershaft drive chain).
MAINTENANCE: Remove the concerned tensioner before starting any job on the chain.
Crankshaft drive chain tensioner: turn the piston by 90°, press back and lock in this position with the specific tool.
Camshaft drive chain tensioner: remove the tensioner. Before installing the camshaft drive chain tensioner, the
internal piston must be pressed against the spring and locked against the last tooth of the piston by turning it
rightwards. The lock is automatically released when the engine is cranked.
Important:
Disrespect of these precautions can cause excessive chain tensioning which could damage the tensioning conduits
and the chain.
1. Camshaft chain tensioner
2. Countershaft chain tensioner locked with specific tool
3. Chain tensioner
4. O-ring
5. Seal
6. Internal piston with spring
7. Thrust piston
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