Posted By: Big Bad Bee
How Do You Press On An Alternator Pulley? - 02/02/14 06:23 AM
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?
Posted By: RapidRobert
Re: How Do You Press On An Alternator Pulley? - 02/02/14 06:35 AM
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.
Posted By: convx4
Re: How Do You Press On An Alternator Pulley? - 02/03/14 01:42 AM
You don't have to disassemble the alternator to get the pulley back on.
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.
I like to have the alternator on the car so I can check for proper belt alinement. Doing it like this is a bit of a pain, but you know its right.
Posted By: MO_PA
Re: How Do You Press On An Alternator Pulley? - 02/03/14 05:15 PM
Heat the pulley for a couple of minutes with a torch and drop it over the shaft. *no brainer*
Posted By: 62maxwgn
Re: How Do You Press On An Alternator Pulley? - 02/03/14 06:37 PM
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 .
Posted By: 80fbody
Re: How Do You Press On An Alternator Pulley? - 02/03/14 07:50 PM
If it slides on by heating the pulley then why is tearing it apart & pressing so much better? Could certainly understand if heating doesn't do the trick...
Posted By: 62maxwgn
Re: How Do You Press On An Alternator Pulley? - 02/03/14 09:24 PM
And how do you know when it's seated properly ?
Posted By: BDW
Re: How Do You Press On An Alternator Pulley? - 02/04/14 12:14 AM
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?
Posted By: bonefish
Re: How Do You Press On An Alternator Pulley? - 02/04/14 04:22 AM
i just push them on as far as they will go then you can pull it out a little at a time till its lined up.i do it on the car or run stand.
Posted By: RapidRobert
Re: How Do You Press On An Alternator Pulley? - 02/04/14 07:07 AM
After all this I'm convinced. My next one I'm gonna freeze the alt overnight (tho you guys are saying that it ain't needed) then slightly heat the pulley & drop her on
. I will not dissassemble the alt