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Distibutor Probs.

Discussion in 'Engine & Transmission' started by NonnoTony48, Nov 2, 2014.

  1. NonnoTony48

    NonnoTony48 Member

    Messages:
    36
    Location:
    Kings Park
    Hi guys my 74 kombi as been running very poorly lately, put my foot down on Accelerator pedal and nothing seems to happen, it as a flat spot same as when timing his too retarded, after trying timing and new spark plugs+distributor cap with no good results, I bit the bullet and took in to my friendly Mechanic for service.
    he told me that the problem is with the vacum advance being warn out and he'snow trying to get the parts to fix it,
    As anyone else had the same Problem.

    Cheers Tony.
     
    Last edited: Nov 2, 2014
  2. deeksy62

    deeksy62 Well-Known Member

    Messages:
    775
    Location:
    Sawtell
    my 1974 kombi was running poorly recently, an old school mechanic suggested i check the earth wire in the distributor, it had frayed at one end and wasn't earthing properly, this made the kombi miss and carry on at higher revs. might be worth checking.

    Steve
     
    NonnoTony48 likes this.
  3. Barry

    Barry Well-Known Member

    Messages:
    6,147
    Location:
    Abbotsford NSW
    do you have a timing light?

    If so put it on and rev the motor

    does it advance?
     
    NonnoTony48 likes this.
  4. NonnoTony48

    NonnoTony48 Member

    Messages:
    36
    Location:
    Kings Park
    Thanks Steve and Barry, yes I have a Timing Light, I will try both your suggestions.
    Cheers Tony.
     
  5. cbus

    cbus Well-Known Member

    Messages:
    13,562
    Location:
    sunshine coast
    also try sucking on the vac line to dissy with cap off and look for movement in the arm fron vac/dissy plate.
    wide open throttle will give no vac but part throttle [especialy at at revs] will
     
  6. NonnoTony48

    NonnoTony48 Member

    Messages:
    36
    Location:
    Kings Park
    Thanks Cbus I'll try you suggestion as well.

    Cheers Tony,
     
  7. cbus

    cbus Well-Known Member

    Messages:
    13,562
    Location:
    sunshine coast
    assuming you are timed at idle to 7.5 deg adv[single vac line to carb?] you should not get any change with vac on or off if carbs are set right and idle at less than 900rpm.
    pull vac line from dissy end and check that theres no /minimal vac at idle

    with vac off. rev up to about 3500. this should give a smooth rise in advance all the way from about 1200 rpm and end at around 30 deg BTDC/adv. most adv will come in fairly early

    with vac on do the same test and with lightish throttle should get more avance earlier which may be hard to be certain about but should definately show up as a total adv higher than the non vac nomber. hopefuly hit 40-44 deg btdc

    if you want a bit more accuracy and have a rev counter measure at each at few pounts and graph the results

    and yes, they do stuff up [vac cans]
     
  8. NonnoTony48

    NonnoTony48 Member

    Messages:
    36
    Location:
    Kings Park
    Thanks Mate, my carbs a set at 1000. so there shouldn't be much problems trying your suggestions, I will try tomorrow and see what shows up.
    Cheers Tony,
     
  9. Mellow Yellow 74

    Mellow Yellow 74 Active Member

    Messages:
    847
    Location:
    Sydney
    I had a problem where my advance mechanism wasn't moving because it was not lubricated after cleaning the gunk off it - I smeared a little grease on it and it works fine
     
  10. NonnoTony48

    NonnoTony48 Member

    Messages:
    36
    Location:
    Kings Park
    Hello Mellow, Did you have to remove the distributor from the engine?

    Cheers Tony.
     
  11. NonnoTony48

    NonnoTony48 Member

    Messages:
    36
    Location:
    Kings Park
    Hi All Today I connected the Timing Light and tried if the distributor Advanced when revving the engine.

    It did advance but only to about 24 BTDC, the result was the same with the Vacuum hose connected o disconnected.
    Looks like my friendly mechanic was right, lets hope he can find the parts to fix the problem.
    Thank you all for the input.

    Cheers Tony.
     
  12. cbus

    cbus Well-Known Member

    Messages:
    13,562
    Location:
    sunshine coast
    should be getting a min of 28 drg . not surprised its a but sluggish. probably running hot on hwy as well.

    needs sorting
     
  13. NonnoTony48

    NonnoTony48 Member

    Messages:
    36
    Location:
    Kings Park
    Thanks Cbus, I'll get it sorted as soon as possible.

    Cheers Tony.
     

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