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    Crank Pulley ?

    We all know about the infamous small nose crank problem.

    I noticed that my crank pulley does wobble a bit. Got me a little worried so I did some research online and found this site
    http://www.miata.net/garage/crankshaft.html

    According to this site a 4 slot pulley is a small nose, 8 slot is a large nose.
    Well my GTX has a 8 slot pulley, I think it has a small flanged bolt though.
    Will a 8 slot pulley fit on a small nose crank?

    #2
    this was a problem on all the 1.6 gtx and gt engines, mine had bad wobble when i pulled it out. i have heard of people taking the pully off and replacing the woodruff key with a new one and a new pully to temorary get rid of the problem
    "See that car, in the 80's that car was deadly." Random man to his son while passing the GTX in a parking lot

    Originally posted by neuspeedescort
    the proper spelling would be "Launchabilitiness" i do believe.
    -88' Mazda 323 GTX, 1.8t, Modified Magazine May 2012
    -88' Mazda 323 GTX, caged and ready for dirt
    -93' Mazda Miata, half caged
    -09' Mercedes C63 AMG
    -87' Toyota Land Cruiser, 33's with slight lift, safari style!

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      #3
      the number of slots thing only applies to miatas.
      Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
      ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
      Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

      Comment


        #4
        Originally posted by therieldeal View Post
        the number of slots thing only applies to miatas.

        So there are no differences between the 3 and 8 slot pulleys, except the slots?

        Comment


          #5
          no you cant use it as a reference point unless you have a miata. the belt system is different so the pulleys are as well.

          all that matters is the bolt and crank nose. all gtx's were small nose... so if its wobbling dont ignore it.
          Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
          ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
          Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

          Comment


            #6
            I'll reiterate that the pulley slot only applies to the Miata. I have an 8 slot pulley on a small nose crank from an early build capri XR2.
            1991 Capri XR2 "GTXR2" BPT AWD Bastardization/conversion
            1991 Isuzu Impulse RS Turbo AWD

            Creator of the B6T Rocketchip
            www.werbatfik.com

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              #7
              I had this problem recently I have a small nose, I was VERY luck all the wear was on the timing cog. Crank and key slot had NO wear.

              Comment


                #8
                Anyone done the loctite fix lately?
                Looking for a supplier for the Wood-ruff Key & the Pulley.
                Thanks

                Comment


                  #9
                  Got mine at mazda

                  Comment


                    #10
                    Originally posted by bcowie View Post
                    Got mine at mazda
                    same^^^, the timing pully was $36, woodruff key $4, assesory pully $250(hopefully thats not bad)
                    "See that car, in the 80's that car was deadly." Random man to his son while passing the GTX in a parking lot

                    Originally posted by neuspeedescort
                    the proper spelling would be "Launchabilitiness" i do believe.
                    -88' Mazda 323 GTX, 1.8t, Modified Magazine May 2012
                    -88' Mazda 323 GTX, caged and ready for dirt
                    -93' Mazda Miata, half caged
                    -09' Mercedes C63 AMG
                    -87' Toyota Land Cruiser, 33's with slight lift, safari style!

                    Comment


                      #11
                      Hey guys, Well my alternator went out a couple of weeks ago. And while it's apart I decided to go ahead and attack the wobbly crank pulley issue. Fortunately it's not to bad. I have few questions...The v-belt crank pulley looks to have a rubber o-ring in it. (I'm assuming this is for harmonics) There is one spot about 1/2" long that the rubber is cracked, on the opposite side of the pulley the rubber is sunken in around the same area (pics below) Does it need replacing???
                      I believe that I may have a very minor leak around the crank as well, should I attempt to change out the seal??? Also the tensioner pulley sounds like there's a hand full of rocks in it, and the idler is on it's way. so those to are on the list The trip to the dealership wasn't very pleasing either... $8 for the key, $51 for the crank timing pulley,$17 for the bolt, $100 tensioner & $89 for the idler.
                      My lower timing belt covers are shot too. Anyone have extras?? If you guys have any leads on parts suppliers please let me know.
                      Thanks
                      Attached Files
                      Last edited by SlingShot; 05-12-2009, 08:48 PM.

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                        #12
                        rockauto?

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                          #13
                          Good thing you caught that before you fuct the crank... how's the keyway in the crank looking?

                          JoN - Automotive Machinist Journeyman/Refrigeration Mechanic Journeyman
                          Member of MX-3.com
                          1996 Mazda MX-3 RS - Creek Blue Mica
                          1993 Mazda MX-3 GS SE - Raspberry... RIP


                          Racing BP (Project "Blue" Marlin)... Twin Scroll GT3071R, breaking 30psi at the moment!

                          "Do it ONCE, do it RIGHT!"

                          Comment


                            #14
                            i have a complete set of plastics if needed plus i have a very clean lower crank pulley if yours is small nosed (i cant tell by pics) let me know i bought a complete tensioner and idler pulley with timing belt off ebay for around 50 bucks i looked @ them once they got here and against the parts house replacement and they where the exact same not even the numbering was different. way to save a few bucks on it.
                            Check out the Pics
                            sigpic
                            http://www.wihandyman.com/forum/vbpi...?do=view&g=228
                            Mazda's Rule Honda's Drool

                            Comment


                              #15
                              price went up but this is the kit i bought http://cgi.ebay.com/ebaymotors/90-94...Q5fAccessories
                              Last edited by 90prtege; 05-14-2009, 01:34 AM.
                              Check out the Pics
                              sigpic
                              http://www.wihandyman.com/forum/vbpi...?do=view&g=228
                              Mazda's Rule Honda's Drool

                              Comment

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