Bert Flywheel Offset / Shims ?

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  • RacerX10
    Senior Member
    • Jun 2007
    • 571
    #1

    Bert Flywheel Offset / Shims ?

    The BERT catalog indicates you should have .080 - .100 gap between the flywheel and the idle gear in the bell housing.

    I'm just wondering how much shim you guys typically need to get that .. it seems like I'm going to need a lot. I've always had trouble with grinding the flywheel ring down to nothing after a few months of racing, but I've never measured for proper offset and I want to get it right this time.

    Thanks !
    Tags: None
    • joedoozer
      Senior Member
      • Nov 2009
      • 745
      #2
      I have never even thought of shimming mine. I guess I got lucky that I don't have to. Although I will tell you if you wash your car weekly you may need to lube that idler every week. If I go 2 or 3 weeks without lubing it, it won't slide out far enough and engage. Makes that horrible grinding sound. Has anyone ever tried putting a grease fitting on that thing?
      Crew Chief "Tip of the day":
      Most handling problems can be solved by adjusting the screw-ball. It can be difficult to fine tune at times. Explaining yourself loudly and striking it on top of the helmet with a dead blow hammer usually works well.

        Comment

        • joedoozer
          Senior Member
          • Nov 2009
          • 745
          #3
          Originally posted by Living_Truth
          I've never had a motor that didn't require shimming. Usually it's at least one thick (.080) and one thin (.040) I'm not sure if the thickness is correct, but I know the thick/thin. I've even had to use 2 thick once before.



          I maybe put grease on it during the install at the start of the year. Other than that, nothing during the season. And I know that goes for a lot of guys I run against as well. Could there be a correlation your lack of engagement and lack of shims?
          If I pull the starter out, and press the gear out with a long screwdriver it engages. I spray some stuff on the idler shaft and it works fine, move it back and forth a few times and no issues. When it's not lubed it's very hard to slide the idler by hand, it binds up. Couple squirts of anything from WD-40 to Lithium Grease and it works fine, no shimming.
          Crew Chief "Tip of the day":
          Most handling problems can be solved by adjusting the screw-ball. It can be difficult to fine tune at times. Explaining yourself loudly and striking it on top of the helmet with a dead blow hammer usually works well.

            Comment

            • HJRacing
              Member
              • Dec 2009
              • 38
              #4
              They make a flywheel that has more offset. I think you just add M to part number. It fixed all my problems. Is there not a grease zerk on the inside of starter to grease the idler?

                Comment

                • joedoozer
                  Senior Member
                  • Nov 2009
                  • 745
                  #5
                  I looked for a fitting inside the bellhousing, through the hole in the top. I didn't see one. The trans is out of the car now, I will give it a better look over tonight.
                  Crew Chief "Tip of the day":
                  Most handling problems can be solved by adjusting the screw-ball. It can be difficult to fine tune at times. Explaining yourself loudly and striking it on top of the helmet with a dead blow hammer usually works well.

                    Comment

                    • Racer111
                      Senior Member
                      • May 2007
                      • 796
                      #6
                      I always put 2 shims on works great..

                        Comment

                        • 21dirt4life
                          Junior Member
                          • Jun 2008
                          • 5
                          #7
                          Bert Flywheel

                          Where are you guys puting shims at my starter does same thing between starter and bellhousing or on flywheel?

                            Comment

                            • crate late
                              Senior Member
                              • Jun 2009
                              • 137
                              #8
                              All of my bell housings had a grease fitting right beside the starter on the idler shaft. The idler shaft is hollow and accepts grease through it to the gears. Put a pump in it every other week or so and that will be a plenty

                                Comment

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