.Bolt fastening alternator to engine block - Chevy Traverse Forum: Chevrolet Traverse Forum
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post #1 of 14 (permalink) Old 10-02-2019, 08:43 PM Thread Starter
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.Bolt fastening alternator to engine block

2012 Traverse. Bolt broke off at engine block. Dealer said engine had to be dropped or raised to drill bolt out. Big $$$$$. Anyone else have this happen or know this repair method to be correct?
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post #2 of 14 (permalink) Old 10-03-2019, 11:56 AM
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Id hit Youtube and look for videos.
There may not be a video with your specific problem-- but there may be videos- tips/tricks on how to remove a broken bolt from tight situations.

2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.

2013 Equinox 3.6L - 88,000
2010 Traverse 3.6L- 153,000
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post #3 of 14 (permalink) Old 10-03-2019, 05:09 PM
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That depends. How much of the bolt broke off? Who broke it? How did it break?

I replaced my alternator - there are two bolts securing the alternator to the engine block, and I have a hard time believing that one "just broke". There are also methods for getting out a broken bolt besides just drilling it out. It is in a pretty cramped space though, so it all depends on how much is broken.
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post #4 of 14 (permalink) Old 10-04-2019, 08:51 PM Thread Starter
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Had just had alternator replaced by garage 1. Garage 2 said bolt most likely not fastened properly when installed and long trip caused bolt to fail and break off at block. Garage 2 said could not get to broken bolt without dropping engine/lifting car body.
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post #5 of 14 (permalink) Old 10-07-2019, 02:06 PM
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Clearly garage 1 should have to fix it. No way that bolt should break off at the block.
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post #6 of 14 (permalink) Old 10-07-2019, 04:48 PM
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I recently changed the alternator on my 2013 about a month before I sold it....it is a [email protected] of a job...took several hours.
There are two bolts holding the alternator to the front of the block, but I can't believe you'd have to drop[ the engine to drill it out. Of course the radiator and a/c condenser would probably have to come out....it is really tight in that dark hole!

Anyway, as I recall, the two bolts are close enough together that I would try this....

I would first install and tighten the remaining good bolt and also the bolt that goes through the pulley on the right side of the engine. Then I would try to use JB Weld to slide the broken bolt into place. I would cover the bolt end (where it broke off) and the sides so that the housing of the bracket helps to hold it. It may not work, but maybe worth a shot.

If that fails, drilling would be the next attempt, but, again, I do not believe the engine has to be dropped out of the car.....ugh!!!

Good luck.
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post #7 of 14 (permalink) Old 10-09-2019, 08:01 PM
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When I replaced my timing chains, I naturally had to remove the alternator as part of the job.

It is a surprisingly tight fit in there, and a real pain to remove/replace.

However, from what I can remember, there should be plenty of room to drill it out once the alternator is removed.

Sure, they might have to use a right angle drill and some stubby drill bits, but I can't say it is too difficult. More just a PITA.

This sounds like a "we don't want to deal with it unless you pay us stupid money".

Of course, if you can get one of the bolts tightened down and JB Weld/tack weld/some other shady attachment, that might be the route to go.

I don't think it's under too much stress once it is in place. Some side load from the belt tensioner, but the bolts don't hold that strain. They just hold it close to the block.

Heck, the one bolt is probably good enough.
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post #8 of 14 (permalink) Old 10-09-2019, 10:09 PM
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Originally Posted by linneje View Post
That depends. How much of the bolt broke off? Who broke it? How did it break?

I replaced my alternator - there are two bolts securing the alternator to the engine block, and I have a hard time believing that one "just broke"
It happens all the time in the heavy road salt states. A steel bolt screwed in to aluminum will corrode over time and weaken.

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post #9 of 14 (permalink) Old 10-17-2019, 11:05 AM Thread Starter
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I misspoke. Broken bolt was going through a pulley. Garage 2 said probably not tightened properly when garage 1 replaced the alternator. Believed that vibration from long trip caused bolt to finally snap.
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post #10 of 14 (permalink) Old 10-17-2019, 01:06 PM
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Now that makes sense. I know where the pulley bolt that is removed for an alternator replacement. They are absolutely correct. There is no way to get at that broken bolt without lifting the engine.
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