car pulley belt

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 accessories, such as the power steering pump, air-con compressor, water pump, or cooling fans. Toothed timing belts and timing chains, too, are used to transmit power from the crankshaft to the camshafts, plus some from the camshaft to camshaft, depending on engine design.

The drive belt, timing belt, or timing chain won't work well, or for very long, if at all, with incorrect tension. A loose drive belt won't drive the item reliably, slipping and producing sound. Conversely, an excessively tight belt may cause item or pulley bearing harm. Various kinds of tensioner pulley maintain long-term engine and item quietness and reliability.

Tightening or Loosening
Sometimes, maintenance or restoration will demand 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 new belt, as the new belt is smaller compared to the worn drive belt.

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

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