Auxiliary drivebelt check end renewal (20 000 mile service)

Routine maintenance and servicing / Auxiliary drivebelt check end renewal (20 000 mile service)

Checking
1 Disconnect the battery negative cable and position it away from the terminal.

2 Park the vehicle on a level surface, apply the handbrake and chock the rear wheels.

3 Raise the front of the vehicle, rest it securely on axle stands (see “Jacking and vehicle support”) and remove the right-hand front roadwheel.

4 Turn the steering to full right hand lock, then remove the plug from the access hole in the inner wheel arch (see illustration) to expose the crankshaft pulley bolt.

15.4 Remove the plug in the inner wheel arch to gain access to the crankshaft pulley bolt (arrowed)

5 Using a socket and wrench on the crankshaft sprocket bolt, rotate the crankshaft so that the full length of the auxiliary 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 6 Working underneath the alternator, slacken the tensioning strut pivot mountings. Slacken the tensioner nut lockscrew by one turn (see illustration).

15.6 Checking the auxiliary drive belt tension

Tensioning
All models except G40
7 Slacken the alternator mounting screws, until the alternator can be moved by hand.

8 Check the belt tension as follows: apply thumb pressure to the belt at a point on its longest run, midway between two pulleys and assess the amount of deflection that can be caused (see illustration). Compare this measurement with that listed in the Specifications.

If necessary, refer to the relevant sub- Section and correctly tension the belt.

15.8 Auxiliary drivebelt tensioning strut, at the base of the alternator (all models except G40)

1 Tensioner nut lockscrew 2 Tensioner nut

9 Tighten the tensioning nut to the specified ‘initial’ torque - this sets the belt tension - then hold the nut in this position and tighten the tensioning nut lockscrew to the specified torque. Note: The tensioning nut ‘initial’ torque figure differs for new and old belts - see Specifications for details 10 Re-tighten the alternator and tensioning strut mounting screws to the specified torque, then start the engine and run it for about 5 minutes, to allow the belt to settle.

11 Stop the engine, then re-tension the Veebelt, as described in paragraphs 8 to 10, but this time tighten the tensioning nut to the ‘final’ torque figure specified.

G40 models with single or twin auxiliary Vee-belts
12 The belt tension is set by rotating the G-charger on its mountings, as follows: 13 With reference to Chapter 4B, slacken the G-charger mounting bracket screws.

14 Insert a square drive torque wrench into the adjusting hole at the edge of the G-charger mounting bracket (see illustrations).

15.14a Auxiliary drivebelt tensioning - pre-December 1990 G40 models

15.14b Auxiliary drivebelt tensioning - post-December 1990 G40 models

Note: On mode/s built before December 1990 it will be necessary to first remove the front radiator grille - refer to Chapter 11 for details.

15 Rotate the wrench anti-clockwise and apply the specified tensioning torque to the G-charger mounting bracket - this sets the belt tension. Hold the G-charger in this position, then tighten the mounting bracket screws to the specified torque. Note: The tensioning torque figure differs for new and old belts - see Specifications for details.

16 Refit the radiator front grille, where applicable.

Renewal
All models except G40
17 With reference to the information given in paragraph 7, slacken the alternator and adjusting strut screws, then pivot the alternator towards the engine to relieve the tension on the belt.

18 Remove the belt, then clean off any deposits that may have built up in the ‘vee’ of the crankshaft and alternator pulleys.

19 Fit the new belt to the crankshaft and alternator pulleys, then refer to the relevant sub-Section and adjust the belt tension.

G40 models with single or twin auxiliary V-belts
20 With reference to the information given in paragraph 13, slacken the mounting bracket screws, then allow the G-charger to pivot down towards the engine to relieve the tension on the belt(s).

21 Lift the off the belt(s), then clean off any deposits that may have built up in the ‘vee’ of the crankshaft, alternator and G-charger pulleys.

22 Fit the new belt over the pulleys, then refer to the relevant sub-Section and adjust the belt tension.