Lucky13
Senior Member
Posts: 154
Loc: Poughkeepsie, NY, USA
Reg: 04-28-01
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04-17-22 05:33 PM - Post#2839947
Greetings - My alternator finally stopped charging. I don't know exactly what I had, but after some research figured out that I have a Delco 10SI, setup in the 3:00 position. I picked up AC Delco 335-1093. Everything looked fine except when I started the car, I found out the alternator fan was hitting the top mounting bracket holding the alternator.
The fan on the original alternator is 4.929" and the new one it about 5.1" in diameter. It was enough to make the edge of the blades strike the edge of the mounting bracket.
I don't really see fan sizes listed as part of the Delco 10SI specs I can find.
What is my best option? I wanted to avoid switching the fan over since the original is a rust bucket and the new one has nice plating on it.
Link to a photo of my issue:
https://photos.app.goo.gl/wrCXHp4h8viVHK1S8
-Scott
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Lead sled
Frequent Contributor
Posts: 2167
Age: 62
Loc: Upstate NY. Catskill mt...
Reg: 11-04-09
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04-17-22 07:40 PM - Post#2839962
In response to Lucky13
If it were me...I'd grind off some of that bracket, paint it up nice, call it good. If not an option for you, put the right fan/pulley on it clean it up THEN call it good. 
Late yr model (Dec. 51 Bel Air/ 52 trim), with a basically stock 68 Camaro SS350/300hp Turbo Fire. Edelbrock 1405,Saginaw 4spd/355 geared 55/6 Chevy rear.2,1st places, and 1 top five award trophies so far
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 GreatNorthWoods
"7th Year" Silver Supporting Member
Posts: 1388
Age: 80
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
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04-18-22 04:36 AM - Post#2839979
In response to Lucky13
What about getting an alternator belt about 1/4 inch longer than the one you have? 
Vern
1953 Chevy Belair Sport Coupe - 355 Chevy V8, 700-R4, 4-wheel disc brakes, Ididit column, cruise/tilt,'59 Vette Steering Wheel, A/C
1930 DeSoto Business Coupe- 350 Chevy V8, EFI, 4-wheel disc brakes, Wire Wheels, TH400, S-10 Rear, A/C |
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55MAS
Senior Member
Posts: 1633
Loc: North Coast, USA
Reg: 12-19-01
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04-18-22 05:18 AM - Post#2839980
In response to GreatNorthWoods
If it were me, I'd go with post #2. But if the bracket is chrome/aluminum going with a longer belt. 1/4" increase in length will not make a difference and may not even be available. You would need to measure the existing belt and determine what the next available length is. Then try it.
OP - a picture would have been helpful but I understand that may not be an option depending on membership level.
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Lucky13
Senior Member
Posts: 154
Loc: Poughkeepsie, NY, USA
Reg: 04-28-01
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04-18-22 06:28 AM - Post#2839984
In response to 55MAS
Thanks so much for the replies. I didn't actually think of a longer belt, that may work out. Thanks GreatNorthWoods & Lead Sled.
Ideally I was wondering if there was just a another part number (10SI variant) or smaller fan I could swap on. Worst case, I will swap the original fan over.
55MAS - I included a link to a photo of the issue. It's a google photo album, so I could not inline it in my post directly.
-Scott
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Lucky13
Senior Member
Posts: 154
Loc: Poughkeepsie, NY, USA
Reg: 04-28-01
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 04-18-22 02:35 PM - Post#2840011
In response to Lucky13
I was able to loosen up all the mounting bolts for the alternator brackets and pull the alternator into position and tighten up the bolts while holding it for clearance. I don't have a ton of clearance, but enough now. Thanks guys. -Scott
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bobb
Super Senior Member
Posts: 6048
Loc: paradise
Reg: 09-05-03
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04-18-22 10:10 PM - Post#2840030
In response to Lucky13
i bet that sound made you jump out of your skin. lol. i hate it when that happens.
| 70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails. |
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Lucky13
Senior Member
Posts: 154
Loc: Poughkeepsie, NY, USA
Reg: 04-28-01
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04-19-22 03:53 PM - Post#2840067
In response to bobb
Yeah not my favorite thing to have happen to a brand new alternator. I kicked myself for not seeing it, but honestly it was so close you were only going to hear it before you saw it. 
-Scott
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55MAS
Senior Member
Posts: 1633
Loc: North Coast, USA
Reg: 12-19-01
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04-20-22 05:25 AM - Post#2840078
In response to Lucky13
55MAS - I included a link to a photo of the issue. It's a google photo album, so I could not inline it in my post directly.
-Scott
Those chromed brackets are most often made from offshore stampings that fit poorly. I once had a big block lower alternator bracket that bolts directly to the driver's cylinder head and DID NOT BOLT up.
I have never seen the interference that you had. I bet you would have proper clearance with a GM bracket. Glad you solved it.
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YOUNG57
Frequent Contributor
Posts: 1340
Loc: Tennessee
Reg: 12-06-10
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06-23-22 07:10 PM - Post#2843278
In response to Lucky13
Simply reverse the position of the chrome adjusting bracket from the front to the back of the alternator threaded boss. Run the bolt in from the back, wa la problem solved.
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