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Loose alternator bolt?
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Globespotter Premium Member
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PostPosted: Sat Jan 13, 2018 12:09 pm    Post subject: Loose alternator bolt? Reply with quote

Running my 77 Westy with Type 4 today - mid winter warm up, and I noticed the hex bolt holding on the alternator bracket was moving slightly back and forth. Is it supposed to do that, or is it supposed to be tight?
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Wasted youth
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PostPosted: Sat Jan 13, 2018 2:27 pm    Post subject: Re: Loose alternator bolt? Reply with quote

The bolt that anchors to this nut? (Photo credit: hazetguy)... or the lower bolt that is underneath the engine? Neither should have any movement in my opinion.

Image may have been reduced in size. Click image to view fullscreen.

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Last edited by Wasted youth on Sat Jan 13, 2018 2:30 pm; edited 2 times in total
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rottenkid
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PostPosted: Sat Jan 13, 2018 2:28 pm    Post subject: Re: Loose alternator bolt? Reply with quote

It should be tight. I believe I used a carriage bolt when I put mine together. So that hexbolt should be tight.
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PostPosted: Sat Jan 13, 2018 2:28 pm    Post subject: Re: Loose alternator bolt? Reply with quote

Everything is supposed to be tight, as in the slider bolt arrangement
& the carriage bolt, (it's indexed by the alternator tin, nut is near the sump
fill tube)
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PostPosted: Sat Jan 13, 2018 2:29 pm    Post subject: Re: Loose alternator bolt? Reply with quote

You are referring to the lower bolt? And not the bolt that adjust the fan belt.
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PostPosted: Sat Jan 13, 2018 4:56 pm    Post subject: Re: Loose alternator bolt? Reply with quote

The bolt accessed in the engine compartment behind the oval plastic cover.
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PostPosted: Sat Jan 13, 2018 5:24 pm    Post subject: Re: Loose alternator bolt? Reply with quote

Globespotter wrote:
The bolt accessed in the engine compartment behind the oval plastic cover.


That bolt should be secure. The nut that holds the bracket to the fan housing above that bolt is also supposed to be secure. The carriage bolt that holds the bottom of the alternator to the fan housing via a stamped metal bracket is supposed to be secure via 13mm nut accessible from underneath. The two 13mm bolts that hold that alternator pivot bracket to the fan housing need to be secure.

I am running into some real issues with these poor engines getting killed by cracks through all of the above, plus the alternator face tin, when they loosen or when people run an obviously imbalanced engine. These parts are drying up. We have to keep them happy.
Colin
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Globespotter Premium Member
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PostPosted: Sat Jan 13, 2018 5:28 pm    Post subject: Re: Loose alternator bolt? Reply with quote

Thanks Colin. I figured it should not be moving. Just noticed it when I was doing a mid winter start and warm up.
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1977 Westfalia - October 2015 - Current
1971 Super Beetle - May 2012 - Current
1979 Westfalia - 1986-1991
1971 Super Beetle - 1977-1980

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My 77 Westy M-Plate decoded: http://www.vw-mplate.com/mplate-30990.htm
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Wildthings
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PostPosted: Sun Jan 14, 2018 5:50 pm    Post subject: Re: Loose alternator bolt? Reply with quote

If the pivot bolt has been loose for long, there is a good chance the holes will have wallowed out by now and the alternator pulley no longer lining up well with the pulley on the crank.
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PostPosted: Mon Jan 15, 2018 12:15 am    Post subject: Re: Loose alternator bolt? Reply with quote

Wildthings wrote:
If the pivot bolt has been loose for long, there is a good chance the holes will have wallowed out by now and the alternator pulley no longer lining up well with the pulley on the crank.


Not an issue. Right now it's barely moving. Thanks.
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1979 Westfalia - 1986-1991
1971 Super Beetle - 1977-1980

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My 77 Westy M-Plate decoded: http://www.vw-mplate.com/mplate-30990.htm
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PostPosted: Mon Jan 15, 2018 12:42 pm    Post subject: Re: Loose alternator bolt? Reply with quote

the bottom U-bracket cracks then the shroud wears where it wiggles and destroys the mount point.
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PostPosted: Mon Feb 19, 2018 1:36 pm    Post subject: Re: Loose alternator bolt? Reply with quote

I got a chance to get under the bus today and check things out. The lower bolt was completely missing. I replaced it and of course now the bracket is nice and firm, however when I tighten the hex bolt, I can't get it tight enough. I think I will need to replace the hex bolt/nut. It is tight, but there is still some movement. Hopefully I can find those parts - 2, 3 & 4 in this pic:

Image may have been reduced in size. Click image to view fullscreen.


Image may have been reduced in size. Click image to view fullscreen.

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1977 Westfalia - October 2015 - Current
1971 Super Beetle - May 2012 - Current
1979 Westfalia - 1986-1991
1971 Super Beetle - 1977-1980

Read the story about my Survivor Super Beetle: http://globespotter.com/survivor/

My 77 Westy M-Plate decoded: http://www.vw-mplate.com/mplate-30990.htm
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Wildthings
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PostPosted: Mon Feb 19, 2018 2:50 pm    Post subject: Re: Loose alternator bolt? Reply with quote

The nut and bolt are pretty basic, unless the bolt is too long and has an unthreaded section I can see how it could not tighten sufficiently. Maybe all you would need to do is add a couple of extra washers under the head?
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PostPosted: Mon Feb 19, 2018 6:01 pm    Post subject: Re: Loose alternator bolt? Reply with quote

Would it be possible that the adjusting arm that special nut rides in has worn thinner then the portion of the nut that sits in the slot so when you clamp it down tight it just bottoms on the nut and not the arm,allowing it to move.
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PostPosted: Mon Feb 19, 2018 7:57 pm    Post subject: Re: Loose alternator bolt? Reply with quote

There are two bolts holding the lower pivot point as well,
if the sliding upper adjustment is left loose/incorrect for long, that lower
mount does get beaten loose from the blower shroud.
Time to check all mounting points, six total.
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PostPosted: Mon Feb 19, 2018 8:12 pm    Post subject: Re: Loose alternator bolt? Reply with quote

lil-jinx wrote:
Would it be possible that the adjusting arm that special nut rides in has worn thinner then the portion of the nut that sits in the slot so when you clamp it down tight it just bottoms on the nut and not the arm,allowing it to move.


It's got to be something like that. I may try to add a washer or two and see if I can tighten it up.

Thanks,
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1977 Westfalia - October 2015 - Current
1971 Super Beetle - May 2012 - Current
1979 Westfalia - 1986-1991
1971 Super Beetle - 1977-1980

Read the story about my Survivor Super Beetle: http://globespotter.com/survivor/

My 77 Westy M-Plate decoded: http://www.vw-mplate.com/mplate-30990.htm
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PostPosted: Tue Feb 20, 2018 6:11 am    Post subject: Re: Loose alternator bolt? Reply with quote

Or shave down the nut a little so it don't protrude thru the bracket slot.
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PostPosted: Sat Feb 24, 2018 12:15 pm    Post subject: Re: Loose alternator bolt? Reply with quote

lil-jinx wrote:
Or shave down the nut a little so it don't protrude thru the bracket slot.


Great tip.

Today I did just that plus added a washer. It tightened up beautifully!

Image may have been reduced in size. Click image to view fullscreen.


Appreciate the responses. That's why I love The Samba!
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1977 Westfalia - October 2015 - Current
1971 Super Beetle - May 2012 - Current
1979 Westfalia - 1986-1991
1971 Super Beetle - 1977-1980

Read the story about my Survivor Super Beetle: http://globespotter.com/survivor/

My 77 Westy M-Plate decoded: http://www.vw-mplate.com/mplate-30990.htm
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