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Username Post: Delco 10SI question        (Topic#368196)
Lucky13 
Senior Member
Posts: 154
Lucky13
Loc: Poughkeepsie, NY, USA
Reg: 04-28-01
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



 


Lead sled 
Frequent Contributor
Posts: 2167
Lead sled
Age: 62
Loc: Upstate NY. Catskill mt...
Reg: 11-04-09
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



 
GreatNorthWoods 
"7th Year" Silver Supporting Member
Posts: 1388
GreatNorthWoods
Age: 80
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
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


 
55MAS 
Senior Member
Posts: 1633

Loc: North Coast, USA
Reg: 12-19-01
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.



 
Lucky13 
Senior Member
Posts: 154
Lucky13
Loc: Poughkeepsie, NY, USA
Reg: 04-28-01
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





 
Lucky13 
Senior Member
Posts: 154
Lucky13
Loc: Poughkeepsie, NY, USA
Reg: 04-28-01
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



 
bobb 
Super Senior Member
Posts: 6048

Loc: paradise
Reg: 09-05-03
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.


 
Lucky13 
Senior Member
Posts: 154
Lucky13
Loc: Poughkeepsie, NY, USA
Reg: 04-28-01
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



 
55MAS 
Senior Member
Posts: 1633

Loc: North Coast, USA
Reg: 12-19-01
04-20-22 05:25 AM - Post#2840078    
    In response to Lucky13

  • Lucky13 Said:

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.





 
YOUNG57 
Frequent Contributor
Posts: 1340

Loc: Tennessee
Reg: 12-06-10
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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