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Replacing Hall Sender on 2.1 Dizzy can it be done.

Discussion in 'T3 & T4 Tech Help Clinic' started by Luckyphil, Aug 3, 2016.

  1. Luckyphil

    Luckyphil Well-Known Member

    Messages:
    7,079
    Location:
    Gosford
    A KC member was recently told by his trusted German VW mechanic that he needs a "new" dizzy as the dizzy in 2.1's cannot be rebuilt with new hall sender only the 1.9 can as the 1.9 has a circlip but the 2.1's are pressed together. As far as I am aware that is absolute rubbish, any thoughts?
     
  2. Grantus

    Grantus Well-Known Member

    Messages:
    18,846
    Location:
    Southern ACT
    The two times in 28 years, that mine have failed, the hall sender on its own was out of stock, but the complete dizzy assembly was available.

    Needing the workhorse back on the road ASAP, I paid for the total assembly.........:confused:

    So I don't know the answer....:(
     
  3. Luckyphil

    Luckyphil Well-Known Member

    Messages:
    7,079
    Location:
    Gosford
    If it happens again the T4 hall sender is a direct fit, Scott just had one put in his 2.1 Dizzy.
     
  4. Syncro27

    Syncro27 Well-Known Member

    Messages:
    6,651
    Location:
    Terrigal, NSW Central Coast
    Yes exactly Phil.

    They are very easy to change - all you need is some pliers, a small socket set, a screw driver, hammer & small punch and preferably a bench vice.

    I am sure there is a write up somewhere or a U-tube video:

    See below (found one but note we only need to remove one 13mm nut on the base of the dizzy hold plate - no need to loosen the angle hold bolt - otherwise you may need to use a timing light to set it up again).



    If I can do it - anyone can.

    With the T4 hall sender - everything plugs in as normal - no need to change around the leads (as my mechanic did for me when he did my last one) - I swapped the leads back around to the correct firing order and it ran perfectly.

    No trouble since.
     
    hairyman likes this.
  5. PUCH 1HM

    PUCH 1HM Member

    Messages:
    36
    Location:
    Mildura, Victoria
    I had to replace hall censor in my Syncro I purchased from Just Kampers $ 160 I think took about 30 minutes to fit after I got the correct one turns out mine was a T4 one As Syncro27 said don't undo the angle bolt. Made a big difference to idling, stopped the missing or popping out the exhaust.
     
  6. Grantus

    Grantus Well-Known Member

    Messages:
    18,846
    Location:
    Southern ACT
    So a "trusted German VW mechanic", should also be able to do it quite easily........:rolleyes:
     
  7. Luckyphil

    Luckyphil Well-Known Member

    Messages:
    7,079
    Location:
    Gosford
    If they are not trying to rip you off that is, or perhaps they dont have a clue
     
  8. Kombi Dad

    Kombi Dad Well-Known Member

    Messages:
    2,457
    Location:
    Bungendore, NSW
    I sourced mine through Volksparts when it failed earlier this year. Nick fitted it to a reconditioned dizzy and sent that to me in Tassie so I didn't have to fiddle around too much.

    Ian
     
  9. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    Why would you use a T4 Hall sender when a T3 is available?
     
  10. hairyman

    hairyman Active Member

    Messages:
    411
    Location:
    Sydney, NSW
    I pulled the dizzy from my 1990 MV engine and the pin in the bottom dog clutch that holds the whole thing together has been pressed in so tightly that I couldn't get it out with a hammer and punch. Maybe I need a press to get the pin out?

    I replace the whole dizzy but i have the old dizzy bust sensor and a new sensor so I'd like to put them together so I have a spare. Any recommendations on how to get the pin out? Drill it out?
     
  11. PUCH 1HM

    PUCH 1HM Member

    Messages:
    36
    Location:
    Mildura, Victoria
    There are 2 models of Dissy for 2.1 one uses T3 hall sender and the other
    vw 025-905-205M Bosch 0237-520-007
    uses T4 hall sender, the T3 one mounts through the side and T4 mount through the plate inside
     
  12. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    I have heard that a press is required.
     
  13. Syncro27

    Syncro27 Well-Known Member

    Messages:
    6,651
    Location:
    Terrigal, NSW Central Coast
    Convenience and price i would say.

    Both work perfectly so who cares?
     
  14. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    It just seems to be a stupid preference to ask for a T4 sensor.

    What is the actual difference between the two then?
     
    Last edited: Aug 5, 2016
  15. hairyman

    hairyman Active Member

    Messages:
    411
    Location:
    Sydney, NSW
    The position of the sensor relative to the plug is different. In the T3 the sensor is on the other side of the dizzy shaft from the plug but in the T4 the sensor is right next to the plug so it reads 180° different. No practical difference.

    I'm surprised the T4 engines didn't have a crank position sensor on the flywheel to be honest
     
  16. Kai

    Kai Well-Known Member

    Messages:
    4,794
    Location:
    Sydney, NSW
    it really depends on what you have currently in your dizzy, just match that up to the new photo.
    T3-
    [​IMG]
    T4 -
    [​IMG]
     
    syncro and Luckyphil like this.
  17. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    If you currently have T4 one in your distributor it means that it has been replaced previously.
     
    Last edited: Aug 5, 2016
  18. nils

    nils Well-Known Member

    Messages:
    1,523
    Location:
    newcastle
    Thanks for the pictures Kai, always good to learn something new
     
  19. Syncro27

    Syncro27 Well-Known Member

    Messages:
    6,651
    Location:
    Terrigal, NSW Central Coast
    Yep thats them.

    They do the same job and judging by the average aftermarket retail costs - the T4 ones are about half price.
     
  20. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    That would be a good reason if they have the same lifespan/performance.
     

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