Author Topic: 403 Olds Alternator + Power Steering Bracket arrangement (Firebird)  (Read 23755 times)

Aus78Formula

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After a few requests and much interest in one of my early pages on another forum of how to fit the accessory brackets for the Oldsmobile engines in Firebird I've decided to upgrade the photos with more accurate photos, details and include fasteners used hopefully to save someone a lot of time in the future.
this is the setup used for both the '77-'79 403 and also the '77 350 Olds in F-bodies.

As you will see I don't have an engine or head to assemble to at present but should still be clear enough.

Starting from the very beginning, the timing cover.
Timing Cover bolt arrangement by Aus78Formula, on Flickr

Timing Cover Fasteners list:
1.  1/4" UNC x 1.25 + flat washers.
2.  5/16" UNC x 1.5" accessory stud with 5/8" extension for alternator black bracket + 2x flat washers + 5/16" nut.
3.  5/16" UNC x 1.5" + flat washers. (Some other applications may use studs #2 for either of the #3 bolts)
4.  3/8" UNC x 1" + flat washers.
4a. This bolt is shown the same as #4 in photo, holds the Timing tag, originally uses an accessory stud 3/8" UNC x 1" x 1.5" extension + flat washer. For originality only, no accessories use this stud in Firebirds.
5.  5/16" UNC x 2.5" accessory stud with 5/8" extension + flat washer used by cars with AIR pump bracket.

Add the water pump showing correct arrangement of bolts and studs fitted, Timing tag and stud not shown.
Water pump to timing cover bolt arrangement by Aus78Formula, on Flickr

Water pump to timing cover bolt arrangement2 by Aus78Formula, on Flickr

The very first part of the brackets is to mount the alloy alternator bracket into the front of the head. Line up the other holes to make sure it's straight before locking up. Do not add a washer or it will foul the Power Steering pump added later.
Alternator alloy bracket 499313 by Aus78Formula, on Flickr

Alloy Alternator bracket #499313 fasteners:
9. 3/8" UNC x 5/8" long, no washers.

Next is the steel alternator bracket, it swings off the stud on the water pump shown earlier.
alternator water pump stud by Aus78Formula, on Flickr

Here's the fasteners required for further assembly of this bracket.
Alternator bracket bolt arrangement by Aus78Formula, on Flickr
Black alternator bracket fasteners:
2.  5/16" UNC x 1.5" accessory stud with 5/8" extension for alternator black bracket + 2x flat washers + 5/16" nut.
7.  3/8" UNC x 4.5" long + heavy flat washer. (passes through tube spacer #8 and all brackets into head)
8.  Tube spacer 3/8" I.D. x 2.5" long.
10.  Alternator bolt 3/8" UNC x 5.25" long + flat washers + 3/8" nut. (Factory uses 3" long threaded into alloy bracket, usually stripped out so longer bolt and nut used)
11.  3/8" UNC x 1" + heavy flat washer. (Threads into captive nut on bracket)

Next is the Power Steering pump assembly, I'll add a few quick pics of how it is setup.
power steering assembly1 by Aus78Formula, on Flickr

power steering front bracket bolts by Aus78Formula, on Flickr
Front PS bracket fasteners:
12.  3/8" UNC x 3/4 long.
13.  3/8" UNC x 1" long.
14.  3/8 I.D. spacer x 3/8" thick.

power steering rear bracket bolts2 by Aus78Formula, on Flickr

Rear PS bracket fasteners:
15.  3/8" flat washers.
16.  3/8" spring washers.
17.  3/8" UNC nuts.
17a. Not shown is 1/4" thick spacer to fit the lower 3/8" stud, will be obvious when you mount plate against the rear which one needs it. (
* The half-height (3/16" thick) 3/8" UNC nuts are parts of the PS pump, one on each stud.)

You should end up with something like this as a complete PS unit:
power steering assembly2 by Aus78Formula, on Flickr

power steering assembly3 by Aus78Formula, on Flickr

power steering assembly4 by Aus78Formula, on Flickr

power steering assembly5 by Aus78Formula, on Flickr

Next you slide the PS unit in between the existing alternator brackets using fasteners below and those with the back steel U bracket above.
power steering rear bracket bolts by Aus78Formula, on Flickr
PS rear bracket fasteners:
6.  3/8" UNC x 1.5" long + heavy washer. (Rear PS bracket threads into head)
6a.  Not shown in pic but should be #11, 3/8" UNC x 1" + heavy flat washer. (Threads into captive nut on black alternator bracket from front PS bracket)
7.  3/8" UNC x 4.5" long + heavy flat washer. (passes through tube spacer #8 and all brackets into head, both standard holes shown)
8.  Tube spacer 3/8" I.D. x 2.5" long.

Olds Fbody powersteering alternator brackets by Aus78Formula, on Flickr

Finally, fit the alternator to complete accessory brackets.
Alternator powersteering bracket setup1 by Aus78Formula, on Flickr

Alternator powersteering bracket setup7 by Aus78Formula, on Flickr

Alternator powersteering bracket setup9 by Aus78Formula, on Flickr

Alternator powersteering bracket setup8 by Aus78Formula, on Flickr
The 3x bolts coming through the base of the alloy bracket thread into the head.

Alternator powersteering bracket setup6 by Aus78Formula, on Flickr

Alternator powersteering bracket setup5 by Aus78Formula, on Flickr

Alternator powersteering bracket setup4 by Aus78Formula, on Flickr

Alternator powersteering bracket setup3 by Aus78Formula, on Flickr

Alternator powersteering bracket setup2 by Aus78Formula, on Flickr

Hopefully, that helped someone, 1/2hr to do, 6hrs to explain with uploaded photos and measuring bolts!
« Last Edit: January 12, 2018, 11:16:24 PM by Aus78Formula »

TransSami

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #1 on: November 16, 2010, 08:25:20 AM »
Great post, excellent documentation!  :P

olds403

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #2 on: November 18, 2010, 10:09:36 PM »
Nice work...

SavingTheBird76

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #3 on: May 27, 2012, 07:05:57 PM »
Very very helpful.
Been searching for weeks for the correct accessory routing.

winks79

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #4 on: May 27, 2012, 07:52:57 PM »
Great job! This needs to be made a permanent post to look back on for reference. You did an excellent job with this.
Chad

Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #4 on: May 27, 2012, 07:52:57 PM »

Brav

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #5 on: July 01, 2012, 11:55:29 AM »
Thank you!  Really helps me with a snapped bolt I had to replace.
79 T/A 403/350 Project

doubleclutch

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #6 on: September 21, 2012, 07:05:15 PM »
This is simply beautiful.

steve78ta

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #7 on: December 02, 2012, 05:59:42 PM »
Awesome job...made me realize I had the wrong set up!
" If you didn't build it, it ain't yours. "

Aus78Formula

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #8 on: March 23, 2013, 02:32:46 AM »
Great job! This needs to be made a permanent post to look back on for reference. You did an excellent job with this.

Yes, it's hard to find, I keep posting links for it!

Lucky Phil

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #9 on: May 18, 2013, 01:38:01 AM »
Ben thanks for all your effort on this write up !!!  No 1
Will come in mighty handy with my rebuild..."yet another thing you helped me with" A+A+A+
cheers Phil :D
« Last Edit: May 18, 2013, 01:41:57 AM by Lucky Phil »

1979 10th Anniversary TA
1978 W87 Currently Restoring Rat Rod Style
1959 Aussie Delivered RHD Bel Air

francis79

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #10 on: June 28, 2013, 05:29:04 AM »
just about to do this , great timing aussie . wish there were more posts like this to help a struggling weekend warrior get his car back together

Aus78Formula

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #11 on: June 28, 2013, 05:33:00 AM »
Happy to help out, throw up any other questions on the forum if you get stumped and the guys will get you through it!

oldskoolubr

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #12 on: June 28, 2013, 07:44:07 AM »
Someone say STICKY?!  :grin:  BTW I couldn't find that Engine mount bracket post that I think was yours ANYWHERE Ben?  I think I figured it out, but wanted to make sure!

Aus78Formula

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #13 on: June 28, 2013, 07:46:13 AM »
I didn't have one, although I've replied in a few, were you checking which holes were for which engines?

Edit: you mean this one?! First post that came up with me in it. That it or another? Gotta love the way some guys sign up, grab info, and never return after you help out.

http://transamcountry.com/community/index.php?topic=50963.0
« Last Edit: June 28, 2013, 07:50:00 AM by Aus78Formula »

oldskoolubr

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #14 on: June 28, 2013, 07:50:17 AM »
No The engine side mount Bracket.  THe Bar that has R and F on it and the str8 one!

Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #14 on: June 28, 2013, 07:50:17 AM »



oldskoolubr

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #15 on: June 29, 2013, 07:57:12 PM »
I didn't have one, although I've replied in a few, were you checking which holes were for which engines?

Edit: you mean this one?! First post that came up with me in it. That it or another? Gotta love the way some guys sign up, grab info, and never return after you help out.

http://transamcountry.com/community/index.php?topic=50963.0
LIL Who Came And left?  :???:
Yes that is the one and I had it right so Good!  Thanks!

Geeves

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #16 on: July 13, 2013, 11:29:17 PM »
I know this is an old thread but can I ask a question?  The alternator bolt that you say is normally stripped, is that the pivot bolt?  Mine seems to be missing.  Is this possible and the alternator is still attached?  If stripped do you drill through that back bracket to put in the longer screw?  I have an issue with squealing on startup so just looking into tightening my belts and saw this tonight.  Any help would be appreciated.  Thanks.

Aus78Formula

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #17 on: July 13, 2013, 11:36:41 PM »
Hi Geeves, yes it's the bolt through the lower ear of the alternator, normally threads into the aluminium brackets thread but over time the threads are often rather average for getting much tension. My original was completely stripped. I just gave it the longer bolt and washer/nut to cover this. Either will work.

The smaller bolt at the top is the same that you set the adjustment by, if you overtension it and the threads in the alloy are not great then you may also have to use a longer bolt and a nut on the back to get some clamping pressure and maintain belt tension.

So basically these two bolts only need to be replaced if the threads in the alloy are faulty and belt can not be tightened enough due to sliding back down bracket, again due to not being able to tighten it just that little bit more. The bolt that came with my rebuilt alternator has the teeth on the rear so rear locks in and doesn't slide, just have to remember to really loosen it off when adjusting, bites in and messes up paint and powdercoating when it moves.
« Last Edit: July 15, 2013, 11:21:19 PM by Aus78Formula »

Geeves

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #18 on: July 15, 2013, 10:49:12 PM »
Thanks for the reply and your very helpful post.  Looking back at the photos of everything together I can see it now.  That bolt on mine must be broken off inside because it is not there on the outside.  And the alloy bracket is not drilled through.  I think the alternator is just pivoting on whats left of that bolt.  I was able to tighten the alternator and it did pivot so thats something I will have to fix.  Thank you.   

Aus78Formula

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #19 on: July 15, 2013, 11:22:46 PM »
Yes, I actually edited my reply as had two details backwards but you knew what I meant. The top bolt threads into the alternator case, often stripped, the lower, loong bolt passes through the alternator and threads into the alloy head bracket, also often stripped.

etown104

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #20 on: September 19, 2013, 07:23:17 AM »
I just joined this forum after searching online for pics on this. I am finishing up build on my 79 and this post just saved me a lot of headache. Sometimes when you work on cars and equipment all the time you get a little overconfident in your memory skills (at least I do?) and post like this really are a great help............

Thanks
etown
1965 ford f100
1979 trans am (403/350/auto)
2008 bullit mustang
2004 f150
2012 buick regal

Aus78Formula

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #21 on: September 19, 2013, 05:45:01 PM »
Welcome to the forum and glad the information was able to assist. I'll have to use this page myself when the time comes to resassemble my engine again.

winks79

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #22 on: November 24, 2013, 06:54:35 AM »
Who should we PM to have this made into a sticky? Mike maybe?
Chad

steve78ta

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #23 on: November 24, 2013, 09:00:09 AM »
Had my wife copy this and I've put it in a file. It was great having it as a reference. Dude is awesome for having done this. Now if I could have just made mine look as good!
" If you didn't build it, it ain't yours. "

olds403

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #24 on: July 27, 2014, 02:27:39 PM »
Great thead.  I missed this one

10mnm

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #25 on: October 04, 2014, 10:59:08 PM »
Saved me lots of time!  I truly appreciate the effort and methodology.  Super job!

1979SE

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #26 on: October 06, 2014, 03:06:20 PM »
What a great resource!  Thanks for taking the time to do this -
Joseph
1979 Trans Am (Sold - Stupid)
1982 Trans Am (Sold - Thank goodness!)
1979 Trans Am SE (Baby!)

Mastertitus

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #27 on: January 12, 2018, 07:51:09 PM »
I would love to see these photos, the brackets on my car are not original. Is there anyway I could get copies of these photos, this forum for some reason will not show them for me?

Aus78Formula

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #28 on: January 12, 2018, 10:18:30 PM »
It's not the forum, it's Photobucket deciding not to allow file sharing anymore. Ok I have just spent the last hour or so re uploading the old pics to Flickr instead. If any pics seems out of sequence or don't make sense let me know.
« Last Edit: January 12, 2018, 11:18:32 PM by Aus78Formula »

Aus78Formula

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Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #29 on: March 03, 2018, 01:58:35 AM »
Someone say STICKY?!  :grin:

The Olds section isn't of interest to the moderators

Re: 403 Olds Alternator + Power Steering Bracket arrangement
« Reply #29 on: March 03, 2018, 01:58:35 AM »
You can help support TAC!