If you have one belt that is going bad, replace them all simultaneously. You don't want to have to do this job again in the near future. When the belts are off, it is time to check all the bearings in the engine accessories, which include the alternator, air pump, water pump, idler pulley, AC pump, and Power Steering pump. Watch the videos below and Kent will explain.
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Related Products:
560LS Radiator Hose Replacement Kit
Set of upper and lower main radiator hoses as shown.
380 500 420 560 V8 Timing Chain Tensioner
New timing chain tensioner and gasket.
1986 to 1991 420 560 V8 A/C Idler Pulley
The bearing in this pulley wears out at 80,000 to 120,000 miles and can cause rumbling sounds while the engine is running. A good time to plan to replace or at least inspect this is when you change the V-belts.
1986 to 1991 420 560 V8 Engine Thermostat 80C
If your engine is taking too long to heat up or is constantly running "hot" it is probably time to replace the thermostat. Kent explains in the video below some other parts you should consider replacing at the same time.
1986 to 1991 420 560 V8 Engine Water Pump
New water pump and gasket as shown. Plan to change the short hose and thermostat at the same time. Inspect v-belts and change if cracked.
1986 to 1991 420 560 V8 Engine Coolant SHORT HOSE Replacement Kit
This critical coolant hose hardly ever gets changed, and when it ruptures, you could experience a catastrophic engine failure. The chief reason is that it is almost impossible to see and inspect.