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How Do You Press On An Alternator Pulley?
#1572666
02/02/14 02:23 AM
02/02/14 02:23 AM
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Joined: Dec 2003
Posts: 10,938
Spokane Valley, WA
Big Bad Bee
OP
I Live Here
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OP
I Live Here
Joined: Dec 2003
Posts: 10,938
Spokane Valley, WA
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I used a standard pulley puller to get it off, but how do I get the pulley back on my alternator? The local parts houses are absolutely no help on old mopar stuff. Since the old pulley shafts aren't tapped and drilled, the kits they sell don't work. I don't want to put pressure on the front bearing by using a steering wheel puller. All I can think of doing is pulling the alternator apart and pressing the pulley back on with a hydraulic press.
what's the method?
I’m listening.
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Re: How Do You Press On An Alternator Pulley?
[Re: Big Bad Bee]
#1572667
02/02/14 02:35 AM
02/02/14 02:35 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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split the case so you can support the back side. Freeze the alt half overnight in the freezer & slightly heat the pulley to expand the ID. Hyd press.
live every 24 hour block of time like it's your last day on earth
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Re: How Do You Press On An Alternator Pulley?
[Re: convx4]
#1572675
02/03/14 02:22 PM
02/03/14 02:22 PM
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Joined: Jan 2003
Posts: 1,009
Richmond Twp. Mi.
Mr340
super stock
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super stock
Joined: Jan 2003
Posts: 1,009
Richmond Twp. Mi.
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Quote:
What I do is place the pulley directly on a 100 watt light bulb. Leave it on for five minuets or so.
This will get it hot enough to expand so with a pair of thick gloves you can slide it into position.
Makes me want to go out and try it.  only thing I'd have to remove a pulley first 
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Re: How Do You Press On An Alternator Pulley?
[Re: Mr340]
#1572676
02/03/14 02:33 PM
02/03/14 02:33 PM
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Joined: Nov 2004
Posts: 7,274
s.w.fl
bonefish
master
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master
Joined: Nov 2004
Posts: 7,274
s.w.fl
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Quote:
Quote:
What I do is place the pulley directly on a 100 watt light bulb. Leave it on for five minuets or so.
This will get it hot enough to expand so with a pair of thick gloves you can slide it into position.
Makes me want to go out and try it. only thing I'd have to remove a pulley first
wher you gunna find a 100 w bulb? do these new bulbs get that hot?
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Re: How Do You Press On An Alternator Pulley?
[Re: 62maxwgn]
#1572679
02/03/14 03:41 PM
02/03/14 03:41 PM
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Joined: Apr 2012
Posts: 18,880
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RSNOMO
Moparts Torchbearer
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Moparts Torchbearer
Joined: Apr 2012
Posts: 18,880
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Quote:
Do it the right way,split the case,support rotor,press it on and be done with it,if you don't have a press get someone else to do it,don't make easy things complicated . 
Thank-You...
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Re: How Do You Press On An Alternator Pulley?
[Re: MO_PA]
#1572681
02/03/14 04:47 PM
02/03/14 04:47 PM
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Joined: Aug 2012
Posts: 1,574
Lakeland FL
floridian
pro stock
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pro stock
Joined: Aug 2012
Posts: 1,574
Lakeland FL
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Quote:
Heat the pulley for a couple of minutes with a torch and drop it over the shaft. *no brainer*
I believe that is what a "Rosebud" torch head is for
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Re: How Do You Press On An Alternator Pulley?
[Re: 62maxwgn]
#1572683
02/03/14 08:14 PM
02/03/14 08:14 PM
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Joined: May 2005
Posts: 4,734
Florida
BDW
master
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master
Joined: May 2005
Posts: 4,734
Florida
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I'd have to do some calculations, but just off the top of my head, I think I be worried about steel that would expand from the heat of a 100W light bulb?
Here we go:
Ok, thermal expansion of steel .0000076in/deg
100w bulb temp 470 deg
so: change in temp is 400, 400 x .0000076 = .00304 thermal expansion,
if pulley diameter is 1/2", then .00304 x 1/2" = 0.0015"
or 1.5 thousands, maybe that is enough?
Last edited by cnxt; 02/03/14 08:25 PM.
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Re: How Do You Press On An Alternator Pulley?
[Re: BDW]
#1572684
02/03/14 09:31 PM
02/03/14 09:31 PM
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Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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Quote:
I'd have to do some calculations, but just off the top of my head, I think I be worried about steel that would expand from the heat of a 100W light bulb?
Here we go:
Ok, thermal expansion of steel .0000076in/deg
100w bulb temp 470 deg
so: change in temp is 400, 400 x .0000076 = .00304 thermal expansion,
if pulley diameter is 1/2", then .00304 x 1/2" = 0.0015"
or 1.5 thousands, maybe that is enough?
Enough pressure is required to seat the pulley on the inner race of the drive end bearing,if you just heat to install,how would you know it was there ?
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Gotcha. Freezing the shaft won't be difficult around here. A night in a ziplock bag out in the snow should do it!
