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.
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 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.
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.
Alloy Alternator bracket 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.
Here's the fasteners required for further assembly of this bracket.
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.
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.
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:
Next you slide the PS unit in between the existing alternator brackets using fasteners below and those with the back steel U bracket above.
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.
Finally, fit the alternator to complete accessory brackets.
The 3x bolts coming through the base of the alloy bracket thread into the head.
Hopefully, that helped someone, 1/2hr to do, 6hrs to explain with uploaded photos and measuring bolts!
