The next time you utilize a drive belt, timing belt, or timing chain, you’ll likely need to loosen a tensioner pulley to remove it. Subsequent these general recommendations and specific guidelines from your owners manual or repair manual, your belt or chain will Car Pulley Belt function for the life of your car.
Toyota and additional timing belt tensioners are loosened simply by removing them from the engine. You must gradually compress them in a bench vice and lock them with a pull-pin before reinstallation.
Hydraulic (not hydraulic-damped) tensioners are almost always situated in the timing case, mostly on vehicles with timing chains, though some are used with timing belts. Hydraulic tensioners are powered by essential oil pressure from the engine oil pump and could press on a tensioner pulley (timing belts) or stress slipper (timing chain). You will likely need the entire year, make, and model information, and you may have to use special equipment 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, while the hydraulic damper keeps it from bouncing under load changes. This prevents timing belts and timing chains slapping and jumping teeth and continues drive belts from slipping and making sound. To loosen a drive belt springtime tensioner pulley, refer initial to the restoration manual or owners manual’s specific 12 months, make, and model information.
You might 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 stress on the belt. You’ll need to hold some springtime tensioners while slipping on 
a fresh belt. Others may possess a locking mechanism, such as a hole for a locking pin or hex crucial.
To loosen an NAI tensioner, loosen the locking nut or bolt, after that back off the tensioner screw. Force the pulley toward the additional pulleys or components, loosening the belt.
Spring tensioner pulleys, because the name implies, make use of a springtime to hold tension on the belt. Most, if not absolutely all, springtime tensioner pulleys are NAI tensioners and include a hydraulic damper. They are more complex and expensive but don’t require modifications and are less prone to user error.