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WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Valve Spring Compressor Components

Courtesy of CHRYSLER GROUP, LLC

Remove the cylinder head. Refer to CYLINDER HEAD, REMOVAL .
Position the (special tool #10224, Adapter, Valve Spring) (2) in the (special tool #C-3422-D, Compressor, Valve Spring) (1).

Fig 2: Valve Spring Adapter, Valve Spring Compressor, Retaining Locks & Valve Springs
Courtesy of CHRYSLER GROUP, LLC

NOTE:
Number 3 cylinder exhaust valve spring compression shown in illustration, all other valves similar.
Compress the valve spring (4) and remove the valve retaining locks (3).

Fig 3: Valve Spring & Retainer
Courtesy of CHRYSLER GROUP, LLC

NOTE:
If the springs are to be reused, identify their positions so that they can be reassembled into their original locations. Number 2 cylinder exhaust valve spring shown in illustration, all other valves similar.
Release the valve spring compression and remove the valve spring retainer (1) and valve spring (2).
If required, remove the valve(s). Refer to VALVES, INTAKE AND EXHAUST, REMOVAL .
If required, remove the valve guide seal and spring seat. Refer to SEAL(S), VALVE GUIDE, REMOVAL .