Note: Fiat specify the use of special timing belt tension setting tools to correctly adjust the timing belt tension. As it is unlikely that this equipment will be available to the home mechanic, an approximate setting can be achieved using the method described below. If the method described is used, the tension must be checked using the special tools at the earliest possible opportunity. Do not drive the vehicle over large distances, or use high engine speeds, until the belt tension is known to be correct. Refer to a Fiat dealer for advice.

General information
1 The function of the timing belt of Fiat Punto is to drive the camshaft and coolant pump. Should the belt slip or break in service, the valve timing will be disturbed and piston-to-valve contact will occur, resulting in serious engine damage.
2 The timing belt should be renewed at the specified intervals or earlier if it is contaminated with oil, or if it is at all noisy m operation (a scraping noise due to uneven wear).
3 If the timing belt of Fiat Punto is being removed, it is a wise precaution to check the condition of the coolant pump at the same time (check for signs of coolant leakage). This may avoid the need to remove the timing belt again at a later stage, should the coolant pump fail.

Removal
4 Set the engine at TDC for No 1 piston.
5 Release the nut on the timing belt ensioner, move the tensioner pulley away from the belt and retighten the nut to hold the pulley in the retracted position (see illustration).



Undo the nut (arrowed) and move the timing belt tensioner pulley away from the belt


6 If the timing belt of Fiat Punto is to be re-used, use white paint or chalk to mark the direction of rotation on the belt (if markings do not already exist), then slip the belt off the sprockets. Note that the crankshaft and camshaft must not be rotated whilst the belt is removed.
7 Check the timing belt carefully for any signs of uneven wear, splitting, or oil contamination. Pay particular attention to the roots of the teeth. Renew it if there is the slightest doubt about its condition. If the engine is undergoing an overhaul, renew the belt as a matter of course, regardless of its apparent condition. The cost of a new bait is nothing compared with the cost of repairs should the belt break in service. If signs of oil contamination are found, trace the source of the oil leak and rectify it. Wash down the engine timing belt area and all related components, to remove all traces of oil.

Refitting
8 Before refitting, thoroughly clean the timing belt sprockets of Fiat Punto. Check that the tensioner pulley rotates freely, without any sign of roughness. If necessary, renew the tensioner pulley.
9 Make sure that the crankshaft and camshaft are still set at their correct TDC positions and, where applicable, the camshaft is locked in the correct position using the special tool.
10 On engines within the range 6.800.001 to 7.000.000, slacken the camshaft sprocket retaining bolt, while holding the sprocket stationary using a suitable toot.
11 With the arrows on the timing belt pointing in the direction of engine rotation, engage the timing belt with the crankshaft sprocket first, then place it around the coolant pump sprocket and the camshaft sprocket. Finally slip the belt around the tensioner pulley.
12 Release the tensioner nut and insert the jaws of a pair of right-angled circlip pliers (or similar) into the two holes on the front face of the tensioner pulley. Rotate the pulley anticlockwise against the belt until the quite taut (see illustration). Check that the crankshaft and camshaft are still at their TDC positions and that, where applicable, the sprocket timing marks are still aligned.



Using right-angled circlip pliers. Turn the tensioner pulley to fully tension the timing belt of Fiat Punto


13 Maintain the effort applied to the tensioner pulley, then tighten the retaining nut.
14 On engines within the range 6.800.001 to 7.000.000, tighten the camshaft sprocket retaining bolt to the specified torque, while holding the sprocket stationary using the method described previously. Remove the dial test Indicator and the camshaft locking tool.
15 Turn the crankshaft through two complete turns in the normal direction of rotation and check that when the centre of the longest turn of the belt is gripped between finger and thumb it can only just be twisted throught 90ยบ.
16 If the belt appears to be too slack or too tight, set the engine at the TDC position as described previously and repeat the complete tensioning procedure.
Caution: The above procedure serves only as a rough guide to setting the belt tension. The tension must be checked accurately by a Fiat dealer using the specialised checking equipment at the earliest opportunity.
17 Where applicable, refit the ignition coil mounting bracket to the cylinder heed of Fiat Punto and secure with the bolt and nuts tightened securely. Reconnect the HT leads and the LT wiring connectors.
18 Refit the timing belt covers, the crankshaft pulley, auxiliary drivebelt, spark plugs and the air cleaner assembly. Adjust the tension of the auxiliary drivebelt.
19 Refit the front wheel and lower the car to the ground.