Auxiliary drivebelt Fiat Punto check and renewal

Note: On models of Fiat Punto with a manually-adjusted drivebelt, Fiat specify the use of a special toot to correctly set the drivebelt tension. If access to this equipment cannot be obtained, an approximate setting can be achieved using the method described below. If the method described is used, the tension should be checked using the special tool at the earliest possible opportunity,
1 A single, multi-ribbed auxiliary drivebelt is used on all models. The belt drives the alternator, or alternator and air conditioning compressor according to equipment fitted. On models without air conditioning, the belt is adjusted manually, whereas on models with air conditioning adjustment is by means of an automatic spring-loaded tensioning mechanism.

Checking
2 Firmly apply the handbrake of Fiat Punto, then jack up the front of the car and support it securely on axie stands. Remove the right-hand front wheel road wheel.
3 Working under the right-hand wheel arch, undo the retaining screws and remove the wheel arch liner main and centre panels for access to the crankshaft pulley (see illustration).



Remove the wheel arch liner panels for access to the crankshaft pulley


4 Using a socket on the crankshaft pulley bolt, rotate the crankshaft so that the full length of the drivebelt can be examined. Look for cracks, splitting and fraying on the surface of the belt: check also for signs of glazing (shiny patches) and separation of the belt plies. If damage or wear is visible, the belt should be renewed.
5 If the condition of the belt is satisfactory, where applicable check the drivebelt tension as described below.

Renewal

Models of Fiat Punto without air conditioning
6 If not already done, proceed as described in paragraphs 2 and 3.
7 Slacken the alternator lower pivot bolt and the upper adjustment bolts (see illustrations). Swivel the alternator towards the engine and slip the drivebelt off the alternator pulley.



Alternator lower pivot bolt (arrowed),



... and upper adjustment bolts (arrowed).


8 Unbolt and remove the crankshaft TDC sensor from the front of the engine of Fiat Punto.
9 Remove the drivebelt from the crankshaft pulley.
10 When renewing a drivebelt, ensure that the correct type is used. Fit the belt around the two pulleys then swivel the alternator outwards to take up any slack in the belt.
11 Refit the crankshaft TDC sensor, then adjust the drivebelt tension correctly as described below.

Models of Fiat Punto with air conditioning
12 If not already done, proceed as described in paragraphs 2 and 3.
13 Undo the two bolts and remove the drivebelt guard from the air conditioning compressor.
14 Using a socket or spanner on the drivebelt tensioner pulley retaining bolt, rotate the tensioner against spring-pressure to release the tension from the belt. Hold the tensioner in this position and slip the drivebelt off the alternator and air conditioning compressor pulleys. Allow the tensioner to return to the released position.
15 Unbolt and remove the crankshaft TDC sensor from the front of the engine of Fiat Punto.
16 Remove the drivebelt from the crankshaft pulley.
17 When renewing a drivebelt, ensure that the correct type is used.
18 Fit the belt around the pulleys, then rotate the tensioner until the belt can be slipped into place under the tensioner pulley.
19 Release the tensioner to allow the spring-loaded arm to automatically tension the belt.
20 Refit the crankshaft TDC sensor, then locate the drivebelt guard in position and secure with the two retaining bolts.
21 Refit the wheel arch liner panels and roadwheel, then lower the car to the ground.

Tensioning
22 Correct tensioning of the belt will ensure that it has a long life. A belt which is too slack will slip and perhaps squeal. Beware, however, of overtightening, as this can cause wear in the alternator bearings. On models equipped with air conditioning the correct belt tension is maintained automatically by means of the spring-loaded tensioning mechanism. On models without air conditioning, the tension must be adjusted manually as follows.
23 The belt should be tensioned so that, under firm thumb pressure, there is approximately 5.0 mm of free movement at the mid-point between the pulleys. To adjust the drivebelt, slacken the alternator pivot and adjustment bolts (if not already done) then swivel the alternator outwards until the belt tension is correct. Hold the alternator in this position and fully tighten the adjustment bolts followed by the pivot bolt.
24 Refit the wheel arch liner panels and roadwheel, then lower the car to the ground.