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  1. #1
    Classifieds Super License
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    Default Hewland questions

    Does anyone know what the drawbolt actually does?? I have heard of people
    running without this.

    Also, I am rebuilding side plates and finding them not wanting to come apart.
    I am applying heat, but maybe need to stick these in the oven, and get them
    up to a uniform 250-300 to get them to release without pressing?? Anyone have
    any tips for this operation?(disassembly)
    Box is MK5 Hewland.

    Best,
    Guil

  2. #2
    Classifieds Super License stonebridge20's Avatar
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    Default

    Draw bolt holds the layshaft, coupler and clutch shaft assembly together. Do NOT run without it. Also, don't tighten it up all the way. Lightly tighten then back off 1/2 to 1 full turn before installing the cotterpin.

    Are you having a hard time removing the output bearings from the side plates?
    Stonebridge Sports & Classics ltd
    15 Great Pasture Rd Danbury, CT. 06810 (203) 744-1120
    www.cryosciencetechnologies.com
    Cryogenic Processing · REM-ISF Processing · Race Prep & Driver Development

  3. #3
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    Default

    Hi, is it an older MK5 or 6 that has roller bearing on the end of diff rather than the MK8 or 9 that has taper bearings? If so you have to heat the side plates so that the alloy expands and the bearing can be pulled from within the casing. i.e. when the do come of the complete bearing remains on the diff. Also start on the side where the diff is held in by the pinion. The MK8/9s are on taper bearings so that the side plates will just pull off as the outer diff bearing will just seperate. All this excludes whatever gunk has been used for gasket seal.

    The early side plates are a PITA

  4. #4
    Classifieds Super License Robert J. Alder's Avatar
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    Default

    Scott Young Enterprises can sell you taper roller bearings to replace the ball bearings on the diff. Do it!

    As already noted, the early side plates (or more precisely the older diff ball bearings) are a PITA. Going to taper roller bearings makes assembly and disassembly of the side-plates sooooo much easier. You'll have to then check and adjust pre-load on the diff and and the left-to right diff location for lash by moving shims. But having the replacement taper bearings make that necessary process sooooo much easier.

    (See pics 19-21 for this "trick" fix.)

  5. #5
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    Default

    Anybody had an issue where the drawbolt thread size is slightly larger than the clutch shaft and won't thread in?

  6. #6
    Classifieds Super License Charles Warner's Avatar
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    Default

    Quote Originally Posted by Lastminuteracin View Post
    Anybody had an issue where the drawbolt thread size is slightly larger than the clutch shaft and won't thread in?
    Try a fine wire brush or sandpaper to make sure there are no burrs.
    Charlie Warner
    fatto gatto racing

    'Cause there's bugger-all down here on earth!

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  8. #7
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    Quote Originally Posted by Charles Warner View Post
    Try a fine wire brush or sandpaper to make sure there are no burrs.
    Good call. Now that I found the exact size (7x1.0) a little tap and die work and it’s good to go. Thanks

  9. #8
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    Default Williams Racing Developments

    Does anyone know if Williams Racing Developments is still in business in Mooresville NC servicing Hewland gearboxes?
    Someone said they may have closed the shop?

  10. #9
    Contributing Member Lotus7's Avatar
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    Quote Originally Posted by m3black99 View Post
    Does anyone know if Williams Racing Developments is still in business in Mooresville NC servicing Hewland gearboxes?
    Someone said they may have closed the shop?
    they had a "going out of business" sale last year (or maybe longer ago?), so I presume yes
    Ian Macpherson
    Savannah, GA
    Race prep, support, and engineering.

  11. #10
    Senior Member
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    Quote Originally Posted by m3black99 View Post
    Does anyone know if Williams Racing Developments is still in business in Mooresville NC servicing Hewland gearboxes?
    Someone said they may have closed the shop?
    Lee is out of the gearbox business

  12. #11
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    thanks very much for the answer.
    I guess my JFR is off to gear daddies for repairs.

  13. #12
    Classifieds Super License Charles Warner's Avatar
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    Quote Originally Posted by m3black99 View Post
    thanks very much for the answer.
    I guess my JFR is off to gear daddies for repairs.
    Scotty Young at scotty@sy-gearboxes.com
    Charlie Warner
    fatto gatto racing

    'Cause there's bugger-all down here on earth!

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  15. #13
    Contributing Member TimH's Avatar
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    Quote Originally Posted by Charles Warner View Post
    Scotty Young at scotty@sy-gearboxes.com
    He was the genius behind Taylor for many years.
    Caldwell D9B - Sold
    Crossle' 30/32/45 Mongrel - Sold
    RF94 Monoshock - here goes nothin'

  16. #14
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    Quote Originally Posted by TimH View Post
    He was the genius behind Taylor for many years.

    And is simply the best. Todd

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