Next time you utilize a drive belt, timing belt, or timing chain, you’ll likely need to loosen a tensioner Car Pulley Belt pulley to remove it. Subsequent these general recommendations and specific guidelines from your owners manual or repair manual, your belt or chain will function for the life span of your car.

Toyota and additional timing belt tensioners are loosened simply by removing them from the engine. You need to gradually compress them in a bench vice and lock them with a pull-pin before reinstallation.
Hydraulic (not hydraulic-damped) tensioners are almost always located in the timing case, mostly upon vehicles with timing chains, while some are used in combination with timing belts. Hydraulic tensioners are powered by essential oil pressure from the engine essential oil pump and may press on a tensioner pulley (timing belts) or stress slipper (timing chain). You will likely need the year, make, and model info, and you may need to use special tools for this sort of tensioner pulley.
Typically, a hydraulic tensioner must be “reset” and locked after removing it from the engine. Remove the lock only following the tensioner, pulley, or slipper, and timing belt or timing chain are set up and aligned.

The spring maintains tension, as the hydraulic damper keeps it from bouncing under load changes. This prevents timing belts and timing chains slapping and jumping teeth and helps to keep drive belts from slipping and producing noise. To loosen a drive belt springtime tensioner pulley, refer initial to the repair manual or owners manual’s specific yr, make, and model details.
You may need a special tool, but many spring tensioners have a square hole, for a 3/8” or 1/2” breaker bar, or a hex or square protrusion for a wrench or socket. Using the correct tool, release pressure on the belt. You’ll need to hold some springtime tensioners while slipping on a fresh belt. Others may have a locking mechanism, like a hole for a locking pin or hex key.

To loosen an NAI tensioner, loosen the locking nut or bolt, after that back off the tensioner screw. Press the pulley toward the additional pulleys or accessories, loosening the belt.
Spring tensioner pulleys, since the name implies, use a springtime to hold tension upon the belt. Most, if not all, springtime tensioner pulleys are NAI tensioners and include a hydraulic damper. They are more technical and expensive but don’t require adjustments and are less susceptible to user error.