General Guide – Setting & Locking FIAT TWIN CAM engines. Timing belt replacement on 1.6, 1.8 16v. and 2.0 20v. Fiat twin camshaft engines is carried out with the crankshaft at TDC, established by using VS1404 TDC Position Tool and a DTI (Fig.1), to determine the piston position in No.1 cylinder, and then by checking that all timing marks align. NOTE: To avoid kit contents duplication, VS1404 TDC Position Tool is not included in individual kits but is available as an Associated Tool. It is used on Fiat 1.6, 1.8 and 2.0 multi-valve engines.

On the 1.6 16v. engine each camshaft is retained in its ‘timed’ position by Setting Plates positioned at the rear of the camshafts. Once crank TDC has been established and camshaft timing positions are ‘locked’, the tensioner is slackened, and the old belt removed. Both camshaft sprockets are released and free to turn on camshafts.

Marks on the new belt are aligned to marks on the sprockets/pulley and fitted in the order given for each engine. Initially the timing belt tension is adjusted to maximum, using the Tensioner Adjuster.
The camshaft sprocket bolts are then tightened, and all setting/locking tools removed.
The engine is rotated by hand and VS1404 TDC Position
Tool refitted to ensure return to TDC.
The tensioner is adjusted to operating position and the engine rotated again and returned to TDC. All timing marks must align.
It is good practice to confirm the timing is correct by adjusting to TDC and refitting the camshaft tools to check the timing position.
WARNING: DO NOT use Camshaft Setting Plates to hold camshafts in position whilst releasing or tightening the sprocket bolts. Plates are for retention of timing position only. Use a suitable Sprocket Holding Tool to counter-hold sprockets, taking care not to damage any position sensors located behind the sprockets.

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