The next time you work with a drive belt, timing belt, or timing chain, you’ll likely have to loosen a tensioner pulley to remove it. Following these general guidelines and specific instructions from your owners manual or restoration manual, your belt or chain will function for the life of your car.
Toyota and additional timing belt tensioners are loosened by simply removing them from the engine. You must slowly compress them in a bench vice and lock them with a pull-pin before reinstallation.
Hydraulic (not hydraulic-damped) tensioners are almost always positioned in the timing case, mostly on vehicles with timing chains, while some are used with timing belts. Hydraulic tensioners are run by 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 information, and you may need to use special tools for this kind of tensioner pulley.
Typically, a hydraulic tensioner must be “reset” and locked after removing it from the engine. Take away the lock only after the tensioner, pulley, or slipper, and timing belt or timing chain are installed 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 tooth and maintains 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 12 months, 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 appropriate tool, release pressure on the belt. You will have to hold some spring tensioners while slipping on a new belt. Others may have 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 cool off the tensioner screw. Drive the pulley toward the additional pulleys or accessories, Car Pulley Belt loosening the belt.
Spring tensioner pulleys, as the name implies, make use of a springtime to hold tension on the belt. Most, if not absolutely all, spring tensioner pulleys are NAI tensioners you need to include a hydraulic damper. They are more complex and expensive but don’t require changes and are less prone to user error.