The Timing Belt of the Volvo 740 ensures a perfectly timed tolerance between the crankshaft and the camshaft and prevents the valves from a catastrophic hit by the piston. The Timing Belt is made of fiber-reinforced rubber with molded teeth, making it circle the crank gear, cam gear, a spring-loaded tensioner, and idler pulleys in such a way that the valve timing is synchronized with piston movement. This applied to be done by chains and gears, but belts were easier to install, less noisy, lighter, and needed no oil for lubrication, and this was a big gain that made Volvo use them in its 740 line, as it had always been Volvo tradition of sensible engineering. The belt itself was developed over the years, with harder compounds and eventually slight curvature of the teeth being applied, increasing the recommended replacement interval by about 30,000 miles to about 60,000 or higher. Despite such improvements, defaulting on the schedule would be inadvisable, as most interference engines will damage the valves when the belt breaks, and a battered tensioner or a dirty belt might allow the belt to skip a tooth, resulting in the car running incorrectly or not at all. The cover should be popped and checked by the owner to ensure that there are no cracks, loss of teeth, frayed fibers, or any spots of oil or coolant, which indicate that it should be changed immediately. In service, automatic tensioners, idler pulleys, and the water pump are replaced, and repeat labor is eliminated, which keeps the fresh Timing Belt accurately loaded. An active maintenance practice keeps each Volvo engine of these vintage models lively and dependable.
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