alternator mounting bolt length 351C

[klinton994]

1971 Mach 1 351C with air

Could someone tell me the correct length of the mounting bolt, and of the spacer that is located between the alternator and the motor?

I recently took off the alternator to install a new harness. Upon re-installing the alternator, it appears the mounting/pivot bolt may be too long. When disassembling, I didn't pay attention to any additional spacers the po may have added.

What I have is a 6" long, hex head bolt and a 1 15/16" spacer.

When I tighten the bolt, it is bottoming out leaving about 3/8" space between the head of the bolt and the mounting bracket.

Searching on line I see multiple lengths of spacers offered.

 

[sdstang]

1971 Mach 1 351C with air

Could someone tell me the correct length of the mounting bolt, and of the spacer that is located between the alternator and the motor?

I recently took off the alternator to install a new harness. Upon re-installing the alternator, it appears the mounting/pivot bolt may be too long. When disassembling, I didn't pay attention to any additional spacers the po may have added.

What I have is a 6" long, hex head bolt and a 1 15/16" spacer.

When I tighten the bolt, it is bottoming out leaving about 3/8" space between the head of the bolt and the mounting bracket.

Searching on line I see multiple lengths of spacers offered.

I don't have the bolt out but my spacer is about 2 1/4" and my at housing is about 3"

351c with AC

 

[Jeff73Mach1]

Pulley alignment is crucial. Use a straight edge across the crank pulley to verify that your alternator pulley is properly aligned. If it isn't it will throw belts. Lots of wrong spacvers have been used with multiple washers-it works, but it is a PITA and is ugly

 

[klinton994]

Pulley alignment is crucial. Use a straight edge across the crank pulley to verify that your alternator pulley is properly aligned. If it isn't it will throw belts. Lots of wrong spacvers have been used with multiple washers-it works, but it is a PITA and is ugly

Thanks Jeff73

I'm not looking for concourse. I am looking for something on the cleaner side in appearance. There must be a standard bolt and spacer length for the 351c application.

The distance from the inside of the mounting bracket to the point on the motor where the alternator mounting bolt threads is close to 5"

The location on the alternator where the mounting bolt passes through is approximately 3". Leaving approximately 2" between the back side of the alternator and the motor. My spacer is 1 15/16" in length.

The 3" measurement on the alternator, plus the 1 15/16" of the spacer is just about equal to the 5" dimension between the alternator bracket and motor.

When I tighten down the mounting bolt it bottoms out leaving about 1/4-3/8" space between the outside of the mounting bracket and the inside face of the bolt head.

To me, it appears that someone has utilized a bolt that is too long.

This is why I am inquiring about stock bolt and spacer length.

 

[RacerX]

Stock bolt length is 5.5" on my 73 351C-2V, UHL (under head length)

5 inches for the alt, bracket and spacer and 1/2 inch for thread engagement in the head bolt hole.

 

[klinton994]

Stock bolt length is 5.5" on my 73 351C-2V, UHL (under head length)

5 inches for the alt, bracket and spacer and 1/2 inch for thread engagement in the head bolt hole.

Racerx

That sounds like the set up I should have. I think someone may have replaced the original bolt with a 6" bolt.

Thanks

 

[sdstang]

Stock bolt length is 5.5" on my 73 351C-2V, UHL (under head length)

5 inches for the alt, bracket and spacer and 1/2 inch for thread engagement in the head bolt hole.

I wonder why my space is longer. Can someone else take a measurement of their spacer and alt?