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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, Valve Spring Compressor Studs & Valve Spring Adapter

Courtesy of CHRYSLER GROUP, LLC

Remove the camshaft bearing housing. Refer to HOUSING, CAMSHAFT BEARING, REMOVAL .
Install the (special tool #10224, Adapter, Valve Spring) (2) and the (special tool #10275, Studs, Valve Spring Compressor) (3) on the (special tool #MD998772A, Compressor, Valve Spring) (1).

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

NOTE:
Number 3 cylinder exhaust valve spring compression shown in illustration, all other valves similar.
Remove the spark plug. Refer to SPARK PLUG, REMOVAL .
Install the (special tool #MD998772A, Compressor, Valve Spring) (1) onto the cylinder head.
Install a spark plug adapter attached to a regulated shop air supply (2). Pressurize the cylinder being serviced to 620.5 - 689 kPa (90 - 100 psi) to hold the valves in place.
CAUTION:
Air pressure must be maintained as long as the valve springs are removed to prevent the valves from dropping into the cylinders.
Using the (special tool #10224, Adapter, Valve Spring) (3), compress valve spring (5) and remove valve retaining locks (4).

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 valve springs similar.
Release the valve spring compression and remove the valve spring retainer (1) and valve spring (2).
If required, remove the valve guide seal and spring seat. Refer to SEAL(S), VALVE GUIDE, REMOVAL .