Alternator tensioner adjuster Bolt size?

Tiny
DAELIZANT
  • MEMBER
  • 2003 HONDA CIVIC
  • 1.7L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
My wingnut/bolt (adjusting bolt) on my alternator bracket came off while on the freeway, Where can I buy a replacement one and what are the dimensions of the bolt? And if I could know how to properly adjust and get it to stay with out coming out due to vibrations?


If photo loads I’m referring to ( A )
Wednesday, September 10th, 2025 AT 8:30 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Sorry the image did not load, it take a while on mobile so be patient. I see the wing nut bolt in this diagram, this will be a dealer item, or you can use a regular bolt from the hardware store. It looks like it is 8mm 1.25 or 1.5 thread pitch 5 inches long. It might take a few tries. Check out the images (below). Let us know if you need anything else.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Wednesday, September 10th, 2025 AT 12:40 PM

Please login or register to post a reply.

Related Alternator Replace/Remove Content

Alternator Replacement
VIDEO
Alternator Replacement
Instructional repair video
Alternator Replacement
GUIDE
Alternator Replacement
Got a red battery warning light on? This most likely means the alternator has gone out and needs a replacement. To confirm the failure use a voltmeter to test the alternator...
VIEW MORE