Damaged thread in dizzy, can't tighten the point - HELP (please)

Discussion in 'Bay Tech Clinic' started by becjane, Mar 21, 2018.

  1. becjane

    becjane Member

    Messages:
    92
    Location:
    Dunsborough
    Hey there,

    I've got a 72 lowlight with a 1600 engine.

    (I'll apologise in advance if my terminology isn't correct throughout this post - but I'll do my best!)

    I'm not that mechanically savvy but I do know when my van starts spluttering and missing it usually means time for a new point. So off clips the distributor cap and out comes the tiny screw that holds the point in place. Only problem is ... this time when I went to put the new point back in and tighten the screw, well it wouldn't tighten. I'm pretty sure the thread in the hole of the dizzy is buggered (1) because the thread on the screw appears fine (2) after removing the screw after trying to tighten it theres tiny slithers of metal around the thread of the screw.

    Question...

    Is there any way I can fix the hole? Can I get a bigger screw orrrrrrr do I need a new dizzy? Have been thinking for a while now of switching to electric ignition so maybe the time is now... Only issue with that is, the mechanics in town (Dunsborough - about 3 hours drive south of Perth) have said they haven't been able to find the part my car needs but they will keep looking. That was a few weeks ago and I need to get back on the road as Jimmy (my van) is my daily drive

    Heres a pic of my van and my fam

    Bec :)

    IMG_7118.jpg
     
  2. galp

    galp Member

    Messages:
    57
    Location:
    ulverstone
    sounds like the screw hole is stripped by your description so that means the distributor baseplate will need repair or replace
    Seeing as its already buggered find a screw that will hold your points to get you by but make sure its the same length so it doesnt fowl on the internals of your distributor
    hope this helps
    cheers
     
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  3. cbus

    cbus Well-Known Member

    Messages:
    10,639
    Location:
    sunshine coast
    You may be able to tap it ti a slightly larger machine screw.
    I ( or someone already clued up on sizings) will check sizes.

    Be careful re length as galp mentioned.

    If an original dissy I would advise keeping it unless paying big dollars for a quality dissy.
     
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  4. Barry

    Barry Well-Known Member

    Messages:
    2,336
    Location:
    Abbotsford NSW
    Is your motor a Type 1 or 4?

    Can you post a pic?

    Looks like a crossover year low light so could be either motor

    If it is a Type 1 (upright) 1600cc it "may" have a 009 which is pretty shitty - but cheap to replace and at least you will be on the road quickly.
    You "may" have a vac advance - which is better, but will take some time to repair.

    I would still bang a 009 in and get the vac one repaired later

    Same same applies if a Type 4 motor but hopefully doesnt have a 009 in there as they behave badly - but still work.... sort of
     
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  5. becjane

    becjane Member

    Messages:
    92
    Location:
    Dunsborough
    Thanks for all the replies so far. I'm not sure what a 009 is but have attached some photos for you
     

    Attached Files:

  6. cbus

    cbus Well-Known Member

    Messages:
    10,639
    Location:
    sunshine coast
    Doesn't matter but you have a vac advance dissy.
    A 009 doesn't have the vacuum advance van that looks like a mushroom on the side.

    Edit.
    An 11/64 is next biggest but mightn't be any screws .
    3/16 is next but would need checking for clearance on points slot.

    My estimate on brazilian made Bosch points for the screw slot is 4.6mm.
    So 5mm screw would be too big.

    Obviously you will need to tap the hole first.
     
    Last edited: Mar 21, 2018
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  7. oldman

    oldman Super Moderator Staff Member

    Messages:
    7,708
    Location:
    Avalon Beach NSW
    See if you can source a replacement, 2nd hand base plate......should be somewhere in Perth that has a shot dizzy lying around suitable for parts...
    Good luck.
    Cheers,
    Mark
     
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  8. cbus

    cbus Well-Known Member

    Messages:
    10,639
    Location:
    sunshine coast
    Or a spot with mig and re tap.

    Also timesert avail in original size.

    A lot of plates are badly worn where the ball bearing rides.

    Is your earth braid in place?
     
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  9. Alpal

    Alpal Moderator Staff Member

    Messages:
    8,218
    Location:
    Melbourne Bend of Islands
    Original post said 1600 so type 1.
     
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  10. 76kampa

    76kampa Active Member

    Messages:
    104
    Location:
    Perth
    removed the unhelpful ideas :)
     
    Last edited: Mar 22, 2018
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  11. Kai

    Kai Well-Known Member

    Messages:
    4,655
    Location:
    Eastlakes, NSW
    original size is m4x6
     
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  12. cbus

    cbus Well-Known Member

    Messages:
    10,639
    Location:
    sunshine coast
    Don't touch cheap copies.
    They are universally crap and perform badly.

    And self tapers are unsuitable.
    They will work in an emergency but the coarse thread will not resist vibration.
    Plus it is likely to further damage the plate with continued use.

    Best to do the job properly
     
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  13. syncro

    syncro Well-Known Member

    Messages:
    8,820
    Location:
    Southern Highlands
    I think that the original screws may have been specials. It was common for them to strip and you just put a new screw in. They may have been designed to be softer than the plate metal. You could try a new screw if you still can buy the correct item.
     
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  14. syncro

    syncro Well-Known Member

    Messages:
    8,820
    Location:
    Southern Highlands
    A breakdown waiting to happen.

    A breakdown waiting to happen.

    ;)
     
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  15. cbus

    cbus Well-Known Member

    Messages:
    10,639
    Location:
    sunshine coast
    JK have them.
    Or at least one the same size.

    Valid point re checking how it holds.
    Screw may have looked ok but the thread compromised at contact area.

    Flush plate hole and test fit a new screw using some WD or similar.
     
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  16. 76kampa

    76kampa Active Member

    Messages:
    104
    Location:
    Perth
    Ah is it the screw thread thats stripped or the plate? the OP said the screw was fine so buying another one wont help, only fix is a bigger screw or a new plate.

    But a cheap dizzy would get the van back on the road...
     
    Last edited: Mar 22, 2018
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  17. oldman

    oldman Super Moderator Staff Member

    Messages:
    7,708
    Location:
    Avalon Beach NSW
     
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  18. cbus

    cbus Well-Known Member

    Messages:
    10,639
    Location:
    sunshine coast
    Its just worth checking.

    I accept that his observation is likely correct, its common for screws to get cross threaded due to difficulty in aligning in kombis without an engine hatch and this would play out on the top of plate and start of screw.

    But there may be sufficient thread remaining for a fresh screw to bite .
    It may be the case that only part thread is damaged.
    It would be best to ensure full thread but often a seemingly damaged thread can function to some degree.

    On larger bolts I often wash out the crap in the hole with WD then carefuly screw in a new bolt to reshape the threads.
    Then assemble using another fresh bolt if I think the " repair" is suffient to be safe.

    Not politically correct but works in many cases and a step up from the common practice of just forcing in a crossthreaded bolt or relying on the other bolts to hold.
     
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  19. cbus

    cbus Well-Known Member

    Messages:
    10,639
    Location:
    sunshine coast
    There is minimal room for a bigger screw.
    Slot in points base is about 4.6-4.7 mm.
    It is beneficial to allow clearance on the points base for ease of adjustment.

    Tapping to a fractionally larger screw is an option if such screw available.
    It will need to be a machine screw not a self tapper.

    Welding or brazing the hole and re tapping to original also an option.
    It runs the risk of distorting plate unless done carefuly.

    Often old screws may also have some wear that a new one will be just enough to work.
    There is also the matter of manufacturing tolerances, crap copies.

    Replacing plate is the easiest option if one has a plate in good condition in regard to said screw hole, where the ball bearing runs and earth braid.

    Retapping hole is an option if suitable sized machine screw available and allows free movement of points base plate.

    Cheap repo dissies are usualy so bad that they are useless.
    The curves are often all over the place and have a lot of scatter due to poor springs and lacking sufficient springs .
    Also a reputation for poor bushes.
    Not an option in my view.
     
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  20. becjane

    becjane Member

    Messages:
    92
    Location:
    Dunsborough
    Ermmm i just had to google what 'tap the hole' was. Now I know what tapping it, well its very obvious that would have to be done first :p
     
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