Auxiliary drivebelt check (12 000 Mile (20 000 Km) / 12 Month Service)
Inspection
1 Check the full length of the drivebelt for cracks and deterioration. It will be necessary to turn the engine in order to check that portion of the drivebelt is in contact with the pulleys.
2 Check that the total deflection of the auxiliary drivebelt is 4.0 mm at the mid point of its longest run.
Auxiliary drivebelt tension checking point - OHV
3 Note that if the belt is too slack, it will slip and soon become glazed or burnt and the coolant pump (OHV) and alternator will not perform correctly, with consequent overheating of the engine and low battery charge. If the belt is too tight, the bearings in the alternator and/or coolant pump will soon be damaged.
4 If necessary, renew or tension the belt as follows:
Renewal
5 To remove a belt, slacken the alternator mounting bolts and the bolts on the adjuster link,
Alternator adjuster and mounting bolts - OHV
A Adjuster link clamp bolt
B Adjuster link-to-block bolt
C Lower front mounting bolt
D Lower rear mounting bolt
push the alternator in towards the engine and slip the belt from the pulleys.
6 Fit the belt by slipping it over the pulley rims while the alternator is still loose on its mountings. Never be tempted to remove or fit a belt by prising it over a pulley without releasing the alternator. Either the pulley will be damaged or the alternator or coolant pump will be distorted.
Tensioning
7 To change the belt tension, pull the alternator away from the engine until the belt is fairly taut and nip up the adjuster strap bolt. A little trial and error may be required to obtain the correct tension.
8 Do not lever against the body of the alternator to tension the belt or damage may occur.
9 Recheck the tension of the drivebelt after the engine has been run for ten minutes.