It is quite an extensive process and requires a significant amount of tools and training to replace a timing chain tensioner. The procedure can lead to engine damage if performed improperly.

To replace a timing chain tensioner, a technician needs to gain access to the front of the engine. This often requires lifting and supporting the vehicle in the air. Shields, guards, covers, ducts, drive belt, and even the radiator might need to be removed as well.

With those items out of the way, a typical timing chain tensioner replacement involves the following general steps (the procedure differs from one vehicle make and model to the next):

• Remove the water pump (on some models)
• Detach the drive pulley on the crankshaft
• Remove any engine accessories (AC compressor, alternator, power steering pump, etc.) that are in the way of the timing cover
• Remove the valve cover(s) (on some models)
• Unbolt and remove the timing cover from the front of the engine
• Synchronize the timing marks on the camshaft and crankshaft sprockets and align to top dead center
• Remove the timing chain tensioner pulley (s)
• Dislodge the crankshaft sprocket and timing chain
• Install a new chain - usually done in tandem with the tensioner(s) - taking care to align to the timing marks
• Install the timing chain tensioner sprockets and set chain tension
• Reinstall all components and add fluids as necessary This abbreviated list of steps does not account for differences between engines, whether your has single or dual camshafts, the style of tensioners used, and other variables. It is common to replace not only the tensioners, but also the timing chain and even the sprockets on which the chain rides. If your engine has a water pump that is driven by the timing chain, that too will be recommended for replacement. The procedure is similar if your engine has a timing belt rather than a chain. If the procedure is not done properly, your engine could fail to run, run poorly, or suffer severe internal damage.