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FYI: 3G alt pulley diameters

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    #1

    FYI: 3G alt pulley diameters

    This is FYI.

    Went to get the 3G alt I had ordered for the '90 GM today. First problem, the outer diameter of the pulley was 3". The 3G alternators on my '88 and '89 are 2 5/8" outer diameter. The 2 5/8" pulley will fit the stock belt. It's a tight fit, but it works. The 3" diameter pulley, however, does not work with the stock belt. I couldn't find a belt that was one size up (no one carries it around here). Two steps up and the belt is way too long. I'm waiting for another 3G alt to come in next week. I will not settle for anything but the 2 5/8" pulley. The pulley from the 65 amp alt will not fit the 130 amp 3G alt. The 65 amp pulley lays against the 3G case and the shaft is not long enough to back it out with washers.

    Hope this saves someone a headache in the future. I'm putting my original 65 amp back in until the right alt shows up.
    Tags: None
    #2
    you gotta grind on the alternator bracket mang.....the 500k6 fits just a bitch to get on

    1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
    2006 Lincoln Town Car Signature. Stock for now
    1989 Ford F-250 4x4 much much more to come, sefi converted so far.
    1986 Toyota pickup with LSC wheels and 225/60/16 tires.
    2008 Hyundai Elantra future Revcon toad
    1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)

    please be patient, rebuilding an empire!

    Comment

      #3
      whats the correct application for the 2 5/8" pulley?? What did the new one cost you?
      Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
      'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
      sigpic
      85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereo

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        #4
        What year & model car is the 3G from?

        My 1989 has a 2G and the pulley is 2 1/8" and the 3G I have for my upgrade has a 2 3/8" pulley.

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          #5
          I ordered the 3G for a '94 Mustang. Second alt I got was a 2 5/8" pulley and worked perfect. The one you have will work fine.

          Comment

            #6
            '94 mustang 5.0 or 3.8??

            I wanna say Ive seen small 3G's on all the 94-97 3.8L mustangs...
            Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
            'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
            sigpic
            85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereo

            Comment

              #7
              Pete, small case 3G I ordered was for the '94 Mustang HO302.

              Comment

                #8
                Originally posted by monterey1962 View Post
                The pulley from the 65 amp alt will not fit the 130 amp 3G alt. The 65 amp pulley lays against the 3G case and the shaft is not long enough to back it out with washers.
                I beg to differ - the first 3G that went into the townie got its stock pulley removed, and received the pulley that is stock for the 2G alternators, surgery involved an air impact gun. IIRC the washer between the 2G pulley and the retaining nut needed removed, as the 3G shaft is indeed a bit shorter. Said alternator will soon be installed in a notch-back Mustang.

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                  #9
                  the 3G I got from a taurus fit fine, I could put the belt on by hand. Tightened it up and it doesn't sqeal anymore.
                  1989 Lincoln Town Car - "Anabelle" - Original block, .030 over with SpeedPro pistons, rods fitted with ARP hardware, FRPP +volume oil pump, GT-40 3bar heads, Crane 1.72 rockers, 89' Fox cam, 93' Cobra lower intake, Explorer upper and 65mm TB, 93' Lightning EGR spacer, K&N intake kit from a 4.0L Ranger, 19lb/hr injectors w/ 87 Mark VII ECM, cat/smog deletes, Big Brake conversion, 3.55 K-Code Trac-Lok/Disc brake rear axle, CVPI LCA's w/1" sway bar in rear, wagon front sway bar, BBK 2.5" off-road H-Pipe, Flowmaster super 40s, HPP wheels, 3G alternator w/LMR.com wiring kit, gear reduction starter conversion, Best 1/4 time: 16.0 @ 85mph.

                  Comment

                    #10
                    When I did the upgrade on my 86', I ordered a New Advantage alt for a 95 Mustang 5.0 like the Scott mang told me. The pulley that came on it was fine, and the belt went on easy enough.
                    sigpic
                    1986 Grand Marquis LS 2 Door
                    Ext: Medium Shadow Blue Metallic, Int: Midnight Blue, 3.08 open, 235/70/15 Goodyear Aquatread III, Rebuilt AOD w/ Transgo Shift Kit, 3G upgrade from 95 5.0 Mustang, Walker Dual Exhaust w/ H pipe, Viper 5900ST alarm, De-smogged, Rear Civ. Sway Bar, and more.

                    Comment

                      #11
                      Some go on easy, some do not. I've also seen different brands of belts be a little different length, even though they were the same size.
                      86 Lincoln Town Car (Galactica).
                      5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                      91 Lincoln Mark VII LSC grandpa spec white and cranberry

                      1984 Lincoln Continental TurboDiesel - rolls coal

                      Originally posted by phayzer5
                      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                      Comment

                        #12
                        I'm with 89LincolnTWNcar. The 3G I got from a taurus fit fine, and works like it came with the car.
                        89 CV LX 225/60 x 16 tires, CC819 rear springs, Front & rear sway bar, trans & PS cooler from 90 cop car. KYB shocks, F-150 on rear. Dual Exhaust w/ H pipe. Dark brown door panels, carpet, steering wheel, trim parts from a 87 Mer GM. Power front buckets from 96 Jeep Cherokee. LED'S front & rear. 3G Alt from a 97 Taurus wagon 3.0. Electric fan. Rear axle from a 97 PI 3.27 with disk brakes. Headlight relays.

                        Comment

                          #13
                          Originally posted by Glen View Post
                          I'm with 89LincolnTWNcar. The 3G I got from a taurus fit fine, and works like it came with the car.
                          +1
                          Originally posted by gadget73
                          There is nothing more permanent than a temporary fix.
                          91 Mercury CP, Lopo 302, AOD, 3.08LSD. 3g upgrade, Moog wagon coils up front, cc819s in the back. KYB GR-2 police shocks. Energy suspension control arm bushings. Smog deleted.
                          93 F-150 XLT, 302, ZF 5-spd from 1-ton, 4wd.
                          Daily--07 Civic Coupe. Bone stock with 25k miles
                          Wife--14 Subaru Outback. 6-speed.
                          95 Subaru Legacy Wagon--red--STOLEN 1/6/13

                          Comment

                            #14
                            I really don't understand why you guys want to get the alt from a Mustang, when there are ton of Taurus in the junk yards. The 3.0 Taurus is a small frame, is a bolt on, and your old belt will fit. What could be easier?
                            89 CV LX 225/60 x 16 tires, CC819 rear springs, Front & rear sway bar, trans & PS cooler from 90 cop car. KYB shocks, F-150 on rear. Dual Exhaust w/ H pipe. Dark brown door panels, carpet, steering wheel, trim parts from a 87 Mer GM. Power front buckets from 96 Jeep Cherokee. LED'S front & rear. 3G Alt from a 97 Taurus wagon 3.0. Electric fan. Rear axle from a 97 PI 3.27 with disk brakes. Headlight relays.

                            Comment

                              #15
                              Originally posted by Glen View Post
                              I really don't understand why you guys want to get the alt from a Mustang, when there are ton of Taurus in the junk yards. The 3.0 Taurus is a small frame, is a bolt on, and your old belt will fit. What could be easier?
                              then I assume the the Taurus 3.8 and windstar are the large case?

                              1989 mercury grand marquis gs / 2014 ford focus s daily driver
                              302 lopo with ho upper/ aod with trans go shift kit
                              k code 3:55 posi rear/big brake swap tow package car

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