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November 6, 2019

For many years, drive belts, V-belts, multi-vee-belts, and serpentine belts have already been used to transmit power from the engine crankshaft pulley to components, such as the power steering pump, air-con compressor, water pump, or cooling fans. Toothed timing belts and timing chains, too, are accustomed to transmit power from the crankshaft to the camshafts, plus some from the camshaft to camshaft, based on engine design.

The drive belt, timing belt, or timing chain won’t work well, or for very long, if, with incorrect tension. A loose drive belt won’t drive the accessory reliably, slipping and making noise. Conversely, an excessively tight belt may cause accessory or pulley bearing harm. Various forms of tensioner pulley preserve long-term engine and accessory quietness and reliability.

Tightening or Loosening
Sometimes, maintenance or repair will require tightening or loosening a tensioner pulley. Replacing a drive belt or timing belt, for instance, would require you to loosen a tensioner pulley to make room for the new belt, as the new belt is smaller than the worn drive belt.

You’ll need to tighten a tensioner pulley, generally, after the installing a new drive belt, or to adapt for a stretched drive belt that hasn’t worn enough to warrant replacement. Stretch out belts don’t require tensioner pulleys but are “stretched” into place using a special tool-always use the special tool to prevent belt damage.

Tensioner pulleys generally fall into two types: accessory-integrated (AI) and non-accessory-integrated (NAI). Think of AI tensioners as adjustable add-ons, such as for example an alternator, and NAI tensioners as adjustable idler pulleys. There are three types of tensioner pulleys and many ways to loosen them.
Mechanical tensioner pulleys are the simplest, the majority of common, and least prone to failure. There is usually one caveat, however, as mechanical tensioner pulleys need manual adjustment. This makes them susceptible to user error, leading to insufficient or Car Pulley Belt extreme belt stress. Additionally, they have to be adjusted to pay for belt stretch over time.