Citroen CX 2400 Engine Restoring
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  1. #1
    Member Houtan's Avatar
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    Default Citroen CX 2400 Engine Restoring

    We have a Citroen CX M23 engine and the engine block and crankshaft have problems and must change, anyone knows that can we use M22 engine block and changing barrels with M23 ones? also can we use M22 crankshaft for M23 engine?

    The cylinder block and crankshaft are same in these two engines?

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  2. #2
    Fellow Frogger
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    Welcome! So, what you are asking is whether you can take a CX 2200 block and crankshaft and fit all the other parts from a CX2400. Is that your question? I don't know the answer, but would expect that the 2400 liners may not fit the 2200 block. The crankshaft could be the same, so check the dimensions of journals etc. for both engines to be sure.

  3. #3
    Member Houtan's Avatar
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    Thanks David,

    Yes, In fact I have a 2400cc Engine that need new cylinder block and new crankshaft, I have also a good 2400cc block but I haven`t new good 2400cc crankshaft, also I have a complete 2200 engine.

    So If the crankshaft in 2200 and 2400 engines is same, I can take and use my 2200 engine`s crankshaft on good 2400 block and other parts from 2400 engine and problem will be solved.

  4. #4
    Member Houtan's Avatar
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    I asked from a Citroen specialist, he told me that in models before 1979 the crankshaft and cylinder block are same in M20, M22 and M23 engines but I must doing changes in cylinder block for using M23 piston barrels, anyone done this before and have any Idea?

  5. #5
    Fellow Frogger! Jinandfonic's Avatar
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    Quote Originally Posted by Houtan View Post
    I asked from a Citroen specialist, he told me that in models before 1979 the crankshaft and cylinder block are same in M20, M22 and M23 engines but I must doing changes in cylinder block for using M23 piston barrels, anyone done this before and have any Idea?
    I have a wreck with an engine that is exactly that so it possible. I haven't seen the previous owner for a long time who did the work himself. Unfortunately the body rust is beyond repair. It was a very smooth running engine. A true Frankenstein CX as was gold, now burgundy; Half 2200 engine & it's gearbox (c-matic removed) a 2400 block and a even some series Ii interior trim.
    Citroen C5 II manual '05; C4 Exculsive '07; Citroen CX2200 Pallas '76; CX2400 C-matic Pallas '78

  6. #6
    Member Houtan's Avatar
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    Now I bout a M20 engine here in Iran, the engine is in very good condition, Now I need M23`s pistons and cylinder barrels and M23 flywheel, I asking from Michael from CX-Basis about pistons and he don`t answering me yet, have you any same company in Australia that sells CX parts? or know any place that I can find M23 pistons?

    Cheers..

  7. #7
    Fellow Frogger
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    I'd suspect DS23 pistons and liners may do the job. Franzose.de and a number of others would carry these as repro parts, so you could ask them and/or compare measurements and part numbers. A flywheel is a very heavy part and international airmail could be completely outrageous. I'd think look for one locally or even have one made using a suitable ring gear.

  8. #8
    Member Houtan's Avatar
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    Thanks David, I asked yesterday from Ansgar Biemann in Fransoze, He told me that they are different The DS23 pistons are 93.50 mm and CX 2.3 pistons are 93.43 mm but I guess if head of the pistons be same and I change liners It will be works. If I don`t find M23 pistons it is plan B.

  9. #9
    Member Houtan's Avatar
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    Now I found 4 pistons and liners in local, Two of pistons are OK, 93.45 and two of them becomes 93.37, The liners is 93.50 and 93.80. anyone think that this piston and liners will works good?

  10. #10
    Fellow Frogger
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    You'd want to check the bores and pistons for variations top to bottom as a start and see if the side clearance is acceptable. I think there would be limits given in the engine data. You may be able to swap them around to ensure a reasonable fit overall. An aftermarket gapless bottom compression ring is another option to consider and it should compensate for some bore variation better than a conventional ring.

    Just an idea, but you could test the piston/liner wear hydrodynamically if you were really keen to even it out between cylinders. It's not something I've ever done myself, but I guess you could fill the liner with a light fluid like kerosene or petrol and see how long it takes the bare piston to displace that fluid as it settles in the liner. That would give you sime idea of the relative wear between piston and liner. Swap them around until they are all roughly the same.

  11. #11
    Member Houtan's Avatar
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    I`m going now for starter motor, the original starter motor must be Ducellier 6236 or biger Paris-Rhone D9E21 but I don`t have any of them, I have a rare Ducellier 6237 starter motor, It is for Peogeot 604 and its head I quess is shorter than 6236, So any Idea that how I can use it on my CX? Have we any same starter motor on Peogeot family cars that can be use on 2.35cc CX?

    I have also a Ducellier 536001A, It is for GTI models but it`s solenoid have problems and I never saw big solenoid like this on any other cars to replace. Starter motor of my ex 12 Cylinder Jaguar was smaller than this big Ducellier.

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