Traction Steering Geometry
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  1. #1
    Fellow Frogger! citroenthusiast's Avatar
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    Default Traction Steering Geometry

    My recently-acquired TAV does not currently run, so we had to winch it onto the trailer and push it into the garage. While pushing it, I noticed that if the car is turned anything more than about 45 degrees at the steering wheel, the tires begin to really scrub (making it really, really difficult to push). Is this normal or is it an indication of something seriously amiss in the steering geometry?

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    Cheers,
    John T.

    54 TAV Legere; 61DS19 LHM BVH (son's); 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

  2. #2
    1000+ Posts gerrypro's Avatar
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    Track rods need to be equal in length and the wheels need to toe out 0-2mm. I like a 1mm toe out! The pitman arm is a keyed taper in the steering swivel. Sometimes the key can shear and the arm twists off line. This situation can produce some really weird geometry on lock and is potentially dangerous. A rough setting for the caster angle is 2-3 threads protruding at the front of the upper link arm pivot shaft. A simple caster angle gauge is shown in the manual and is easy to make. The drawing has a labelling error but is easy to work out. If you have checked out all of the above and it is all according to 'Hoyle' then something else may be bent or badly worn. It is possible to bend a lower link arm but very rare!
    Cheers Gerry

  3. #3
    Fellow Frogger! Greg's Avatar
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    Hi Guys,

    I agree with what Gerry has suggested, but your problem may also be someone has fiddled with the end adjustments on either end of the rack to decrease the turning circle?

    Best regards,

    Greg
    We Have:
    C5 HDI Exclusive 2.7 '09, Pluriel '09, Berlingo 1.6 HDI '10, C4 VTS coupe. C4 Picasso '08, 2CV Charleston '84 Grey, 2CV, '55 Australian delivered. 15/6 H '55, SM '74 BVM, DS21 EFI BVH, DS21 '67 BVH.
    We Had:
    1930C6F, '73 GS1220 wagon X 2, '75 G special, '75 GS panel van, '74 GS Birotor, '82 GSA panel van with factory AC, '85 CX25GTI BVM, 2002 C5 V6, 2006, C5 S2 HDI, '86 BX19GT, '72 DS21 BVM, '55 15/6H, '54 Lt 15,'73 Dyane, '82 Visa Super X, with Chrono Mecs & factory AC, 1972 SM.

  4. #4
    Fellow Frogger! Greg's Avatar
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    Default

    Hi Guys,

    I agree with what Gerry has suggested, but your problem may also be someone has fiddled with the end adjustments on either end of the rack to decrease the turning circle?

    Best regards,

    Greg
    We Have:
    C5 HDI Exclusive 2.7 '09, Pluriel '09, Berlingo 1.6 HDI '10, C4 VTS coupe. C4 Picasso '08, 2CV Charleston '84 Grey, 2CV, '55 Australian delivered. 15/6 H '55, SM '74 BVM, DS21 EFI BVH, DS21 '67 BVH.
    We Had:
    1930C6F, '73 GS1220 wagon X 2, '75 G special, '75 GS panel van, '74 GS Birotor, '82 GSA panel van with factory AC, '85 CX25GTI BVM, 2002 C5 V6, 2006, C5 S2 HDI, '86 BX19GT, '72 DS21 BVM, '55 15/6H, '54 Lt 15,'73 Dyane, '82 Visa Super X, with Chrono Mecs & factory AC, 1972 SM.

  5. #5
    Fellow Frogger! citroenthusiast's Avatar
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    Thanks for the replies. This confirms my suspicion that Citroen designed the TAV to have proper Ackerman steering geometry, but something here is wrong. I will have to investigate further....
    Cheers,
    John T.

    54 TAV Legere; 61DS19 LHM BVH (son's); 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

  6. #6
    1000+ Posts gerrypro's Avatar
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    Yes the car was designed according to the Ackerman principles! It is also possible that there is movement of the lower link arm either through worn out silent blocs or through corrosion of the leading section of spline on the splined pin that passes through the lower link and both silent blocs.
    Cheers Gerry

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