You could go to your local auto parts store and purchase a thread repair kit the correct size you are looking for. The kit will supply you with directions and what you need to replace the damaged threads with an insert of correct size for aprox $20. All you should need is an electric drill and drill bits.
Turn the bolt to the left to remove it.
The bolt holding the pulley to the tensioner arm is left hand thread. The nut holding the tensioner to the engine is right hand thread.
facing the engine you turn to the right it is r/ hand thread if you look at tne bolt head which is behind the pulley
drill it out with a power drill
UNC stands for "UNIFIED BOLT THREAD COARSE" UNF stands for " UNIFIED BOLT THREAD FINE"
It is a standered fine thread bolt, Grade 8
Broken fasteners, engine crankcase thread damage, etc.
No it is not. The bolt on the pulley is but the tensioner mounting bolt is a T55 torx bit head with the standard thread (right/tight left/loose).
To access the rotor, remove the tire and brake caliper. There will be a cap protecting the bolt that holds the rotor onto the spindle. Removing the cap, located in the center of the rotor (on the spindle, not the rotor itself) will allow you to get access to the bolt. Removing that bolt frees the rotor from the spindle.
A thread guide is a tool to measure the number and pitch of threads on a bolt
The bolts are right hand thread (BUT) U DON"T want 2 remove the bolt in the center of he pully.U have 2 replace the tensioner & bracket assembly.There is many pounds of pressure on the tensioner spring
Right hand thread