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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: Garter Spring, Valve Guide Seal & Spring Seat

Courtesy of CHRYSLER GROUP, LLC

If removed, install the valve(s). Refer to VALVES, INTAKE AND EXHAUST, INSTALLATION .
NOTE:
Reassemble the valves into their original locations. If the valves or valve seats have been refinished, verify that the valve stem tip height is within specification. Refer to ENGINE SPECIFICATIONS .
If removed, install the spring seat (3) and valve guide seal (2) over the valve guide. Refer to SEAL(S), VALVE GUIDE, INSTALLATION .
NOTE:
Make sure that the garter spring (1) is intact around the top of the valve guide seal (2). Number 2 cylinder exhaust valve guide seal shown in illustration, all other valves similar.

Fig 2: Valve Spring & Retainer
Courtesy of CHRYSLER GROUP, LLC

NOTE:
If the valve springs are being reused, reassemble them into their original locations. Number 2 cylinder exhaust valve spring shown in illustration, all other valves similar.
Install the valve spring (2) and valve spring retainer (1).

Fig 3: 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. If the valves or valve seats have been refinished, verify that the installed height of the valve springs is within specification. Refer to ENGINE SPECIFICATIONS .
Compress valve springs (4) with the (special tool #10224, Adapter, Valve Spring) (1) mounted in the (special tool #C-3422-D, Compressor, Valve Spring) (2). Install the retaining locks (3) and release the valve spring compression.
Install the cylinder head. Refer to CYLINDER HEAD, INSTALLATION .