Citroen CX2400 C-Matic torque converter type 693 wanted
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  1. #1
    Tadpole
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    Default Citroen CX2400 C-Matic torque converter type 693 wanted

    Citroen CX C-matic 2400, 1979: I have done an extensive restoration but, compared with a friendís identical model, my vehicle seems to lack good acceleration and starting off on level ground in second, which should be a breeze, is not the case. I feel sure the engine is fine. My suspicion is the torque converter is the culprit. I have checked electrovalve operates properly; gear changing is easy; oil pump delivers correct pressure; gearbox oil is absolutely clean; there is no vibration and I can detect no clutch slip.
    Changing the torque converter appears to be necessary. If anyone has a type 693, preferably new, I would appreciate you contact me please. I seem to recall a member had, at one time, a number of new torque converters. If you know this member and he still has a 693 for sale please let me know.


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  2. #2
    Fellow Frogger! blahblah's Avatar
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    Hello,

    You could have it reconditioned by a transmission specialist - I don't think they're anything special inside. Before that though, have you got the means to check the transmission oil pressure while driving? I'd be tempted to see how it behaves while on the road. Might give some clues as to what is going on...

    Cheers, Chris

  3. #3
    Tadpole
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    Quote Originally Posted by blahblah View Post
    Hello,

    You could have it reconditioned by a transmission specialist - I don't think they're anything special inside. Before that though, have you got the means to check the transmission oil pressure while driving? I'd be tempted to see how it behaves while on the road. Might give some clues as to what is going on...

    Cheers, Chris
    Thanks Chris,
    I have checked transmission oil pressure while stationary as per Haynes manual and the oil pump is delivering correct pressure at various engine rpm. In the end, I think your advice about getting converter reconditioned would be the best way to go. thanks again.

  4. #4
    Fellow Frogger!
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    I'd start with a 123 ignition distributor to make sure the motor is delivering full torque at converter stall speeds. Will improve overall performance, economy & smoothness at all speeds even if it doesn't cure the problem.

    Richard

  5. #5
    1000+ Posts gerrypro's Avatar
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    Quote Originally Posted by citroenut View Post
    I'd start with a 123 ignition distributor to make sure the motor is delivering full torque at converter stall speeds. Will improve overall performance, economy & smoothness at all speeds even if it doesn't cure the problem.

    Richard
    Where on earth are you going to get a 123 ignition for a CX? The distributor rotated the opposite way to a DS.
    Cheers Gerry

  6. #6
    1000+ Posts gerrypro's Avatar
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    Sluggish performance from a C-Matic torque converter is usually due to dirt and detritus building up around the peripheral seal of the internal clutch. It can take quite a number of fluid changes to get rid of this. My car required 12 litres of fluid through it to remove the muck. I used dexron 2 which I know is a little severe on synchros but it has better cleaning properties. I ran each change for about 1000 kilometres before draining and refilling. The amount of muck removed was amazing. When I was finally happy with the changes and pick up I drained and refilled with Transmax type F. This needed several changes also to finally dilute the dexron that was residual in the torque converter down to an acceptable level.
    Give it a try and see if you can save the trouble of locating a new converter.
    Unfortunately the C-Matics were never given the appropriate care and attention that was required by past owners of these cars ----unfortunately, a legacy of exorbitant dealer servicing charges.
    Cheers Gerry

  7. #7
    Tadpole
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    Quote Originally Posted by citroenut View Post
    I'd start with a 123 ignition distributor to make sure the motor is delivering full torque at converter stall speeds. Will improve overall performance, economy & smoothness at all speeds even if it doesn't cure the problem.

    Richard
    A few months back I installed a distributor kit (K504) from a uk company called powerspark. it is a hall-effect type that fitted ducellior with vacuum advance. the idling is now very smooth and even. My feeling is the engine is operating as it should.

  8. #8
    Tadpole
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    Thanks for your comments. Actually the transmax type F in gearbox is very clean. It is true I may not have given the converter a sufficient workout. While your suggested remedy would take time it is definitely a lot less work than removing engine/gearbox etc. Your comments suggest to me that, in the absence of unusual noises, and this is the case, that mechanically the converter should be ok and that cleaning it out thoroughly may well return it to acceptable.

  9. #9
    JBN
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    I bought a CX 2400 C-matic with a crook torque convertor. First I had the convertor reconditioned but that didn't work. Then I bought a new convertor and that did work. I added a Luminition ignition and that was great - just replaced the points with an infrared light sensor and "cutter" blade.

    The real performance came when I managed to trace a set of twin Webber 45DCNF dual throat carbs with dual manifolds and airbox. These were created for the Citroen Rally Team when they rallied CXs. I sourced that through the UK Citroen Car Club. Sadly, I have no idea where the wreck of my CX ended up. Apart from the carbys, Luminition, TRX mags and tyres, suede uoholstery and dual aircon, it also had a good C-matic and solenoid.

    John

  10. #10
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    Re the new distributor the change to an electronic one is a good move but after fitting it did you .check that the advance related to rpm is as it should be?

    Know of a CX which exhibited a fault almost as you describe and it was traced to the new distributor, just a thought.

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