car pulley belt

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 instructions from your own owners manual or repair manual, your belt or chain will function for the life span of your car.

Toyota and other timing belt tensioners are loosened simply by 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 nearly always located in the timing case, mostly upon automobiles with timing chains, though some are used in combination with timing belts. Hydraulic tensioners are powered by essential oil pressure from the engine oil pump and may press on a tensioner pulley (timing belts) or pressure slipper (timing chain). You’ll likely need the entire year, make, and model info, and you may have to use special equipment for this sort of tensioner pulley.
Typically, a hydraulic tensioner needs to 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 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 making noise. To loosen a drive belt springtime tensioner pulley, refer first 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 Car Pulley Belt 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 tension on the belt. You will have to hold some spring tensioners while slipping on a fresh belt. Others may possess a locking mechanism, like a hole for a locking pin or hex important.

To loosen an NAI tensioner, loosen the locking nut or bolt, then cool off the tensioner screw. Drive the pulley toward the additional pulleys or components, loosening the belt.
Spring tensioner pulleys, since the name implies, use a spring to hold tension on the belt. Most, if not all, springtime tensioner pulleys are NAI tensioners you need to include a hydraulic damper. They are more technical and expensive but don’t require adjustments and are less prone to user error.