For decades, 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, and some from the camshaft to camshaft, based on engine design.

The drive belt, timing belt, or timing chain will not work well, or for lengthy, if, with incorrect tension. A loose drive belt won’t drive the accessory reliably, slipping and producing noise. Conversely, an excessively limited belt may cause accessory or pulley bearing damage. Various kinds 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 example, would need you to loosen a tensioner pulley to make room for the brand new belt, as the brand new belt is smaller sized compared to the worn drive belt.

You will have to tighten a tensioner pulley, in most cases, after the installing a new drive belt, or to change for a stretched drive belt that hasn’t worn enough to warrant replacement. Extend belts don’t require tensioner pulleys but are “stretched” into place utilizing a Car Pulley Belt special tool-always use the special tool to prevent belt damage.

Tensioner pulleys generally fall into two categories: accessory-integrated (AI) and non-accessory-integrated (NAI). Think about AI tensioners as adjustable components, such as an alternator, and NAI tensioners as adjustable idler pulleys. There are three types of tensioner pulleys and many methods to loosen them.
Mechanical tensioner pulleys are the simplest, the majority of common, and least susceptible to failure. There is one caveat, nevertheless, as mechanical tensioner pulleys need manual adjustment. This makes them prone to user error, leading to insufficient or excessive belt tension. Additionally, they have to be adjusted to compensate for belt stretch as time passes.