![]() ![]() However, timing chains are not trouble-free. ![]() That has forced them to switch to timing chains in many applications. Timing-belt-in-oil designĬarmakers have been under pressure to eliminate timing belts from their engines due to the high cost of replacement. Once set to the correct tension, the tensioner maintains that tension for the life of the belt. Timing belts are tensioned with a spring loaded or hydraulic tensioner. The flat backside of the belt may be used to drive the engine’s water pump in some applications. The cogged side of the belt mates with corresponding cogged pulleys connected to the crankshaft, balance shaft(s), camshafts and idler rollers. The flat backside of the belt has an embedded fabric material to drive flat pulleys and resist wearĮxample of a serpentine belt driving engine components from both the ribbed and flat sides of the beltĪ timing belt is a cogged belt designed to rotate the camshafts in exact time with the crankshaft. The “V” profiles provide the “traction” to rotate the driven components. The multi-ribbed side of the belt incorporates multiple “V’ profiles that mate with corresponding channels in the components pulleys. The belt is constructed with stretch resistant embedded tensile cords, usually made from aramid. EPDM is heat and crack resistant and provides higher resistance to vehicle fluids and oxidation than older neoprene elastomeric materials. Serpentine belt constructionĪ serpentine belt is constructed using Ethylene Polypropylene Diene (EPDM) and other high-tech materials. Once it is removed, it cannot be reused, even if it is not worn out. It is designed to stretch over the pulleys during installation using a special tool. If you continue to drive with a broken/missing serpentine belt, your engine will most likely overheat.Ī stretch polygroove belt does not need a tensioner. If a serpentine belt breaks, your engine will not longer generate power, cool the engine, run the hydraulic power steering or operate the AC. Serpentine belt versus timing belt - the implications if they wear or break Timing belts are tensioned with spring loaded or hydraulic tensioners. In still other applications, the timing belt may be used to drive a water pump. In some applications the timing belt may also drive balance shafts in time with the crankshaft and camshafts. It is used to rotate the camshafts in time with the crankshaft. It is tensioned by an automatic tensioner.Ī timing belt is mounted at the front of the engine and covered by a timing belt cover. A serpentine belt is driven by the harmonic balancer located on the front of the engine. Repair Topics > Belts Serpentine & Timing > Serpentine belt versus timing belt Serpentine belt versus timing belt Serpentine belt versus timing belt - What’s the difference? Serpentine belt versus timing belt - what they doĪ serpentine belt drives accessory components like the alternator, water pump, power steering pump, smog pump, AC compressor. ![]()
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