My alternator is bad and I'm trying to replace it, but the bottom bolt that runs all the way through the alternator won't budge. I'm using a 14mm box ended wrench and I can't for the life of me get the bolt to move (honestly don't even know which direction I should be turning it, down towards the front of the car or up towards the back). I've stripped the bolt a tiny bit and before I made it worse wanted to see what I can do to get this bolt off.
Orionox
Welcome to the site Orion -
Lefty losey - turn the bolt head to its left to losen. Hit the bolt with some penetrating spray, wait a bit, then use a breaker bar to add torque. Your best bet is to use a 6 point socket instead of 12 point. 12 point can slip a bit and round off the shoulder.
Lefty losey - turn the bolt head to its left to losen. Hit the bolt with some penetrating spray, wait a bit, then use a breaker bar to add torque. Your best bet is to use a 6 point socket instead of 12 point. 12 point can slip a bit and round off the shoulder.
I'm late but spray the bolt on the opposite side with a lot of penetrating fluid and let it sit. Use a breaker bar and turn the bolt towards the back of the car (left to loosen). I broke that bolt on my car when I was replacing the alternator and I was lucky enough for the bolt to break in the alternator so that it could still come out. You may not be so lucky so make sure you proceed with caution.
Had the same problem. Wouldn't budge with a breaker bar. Didn't want to break the bolt or round its head so oaked it with penetrating fluid for two days, then put a Milwaukee Compact impact wrench on it. 
If I had it to do over again I would consider removing the radiator hose for better access.
If I had it to do over again I would consider removing the radiator hose for better access.
I cannot seem to get this bolt in to mount the alternator I get it through the first hole I cannot get it through the second
Who manufactured it? Will need to either modify the holes or exchange it for the right one. If you exchange it, bring the bolts with you to test on before you take it home.
I did all of that before I bought the new one and when I take the alternator off of the car the boat goes straight through to the other side and starts threading it just doesn't make sense to me it's a 2012 Toyota Corolla
Sometimes in the cast, the hole is too small. Take a drill of same size as bolt and massage the opening. I had to do this on a BBB industry alternator for my Mazda. It was only on the alternator. The bracket was fine on the engine. Has to be done.
These bolts have tapered heads nominally 14mm but will strip if you use a socket. 2 ways out of it1. Use a six point socket, but you can get a 1/4 whitworth socket and bash it on the bolt head and undo it normally. When yo get the bolt out replace it wit a normal bolt , pu the old one in a vyse and haneer it sideways until id comes off.
Regards darrell
Regards darrell
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