My Citroen CX Engine Again Cutted Valve !
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Thread: My Citroen CX Engine Again Cutted Valve !

  1. #1
    Tadpole
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    Default My Citroen CX Engine Again Cutted Valve !

    Hi. We have got a 84' Citroen Cx 2500TRD. I have got this car for 20 years. I replaced engine 3 months ago. ( Piston bearing , piston ring , turbo , head gasket and some parts ...) But engine 1 months ago cutted valve and damaged engine. Engine head and 4 pistons went trash ! But I'm living in Turkey so I cant find engine head. After I found another engine head and harmonized my engine. I changed damaged parts etc...
    Pistons are not problem because I have got 4 original pistons.
    After my cx engine not worked well. When I started the engine white smoke coming out of exhaust...
    I did not mind... 2 days ago , engine cutted valve again ! I opened Turbo and it has got water... My new engine head is again trash. One piston has got very damage.
    Why my engine always cutting valve ? I cant understand... What am I doing wrong ?
    Cx is getting too expensive for me.

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    First cutted valve and rebuilded engine photo
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    First cutted valve and rebuilded engine working video
    https://youtu.be/l81qNRenahM

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  2. #2
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    Incorrect valve clearence to loose .

  3. #3
    1000+ Posts Ken W's Avatar
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    Did you replace all the valves in the head when you rebuilt the engine after the last failure?

  4. #4
    Fellow Frogger!
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    I have read stories of sodium -filled valves losing their heads resulting in damaged pistons and engine heads.
    Google "sodium- filled valve failures". Ken W ( above) may hold a clue.

  5. #5
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    Is it possible that heavy duty valve springs have been fitted that are too strong for these valves?

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    Sounded very rattley;valve clearance?

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    Hi fxhec
    Sorry to hear about your problems again. It is very difficult to diagnose problems on the internet. You do need to find an experienced mechanic close to you to correctly diagnose your problems.

    Getting random suggestion on here is not helping. I did say before that you must find the first cause of your failure last time or you risk having it happen again. I think now that is all I can say to help you.

    Good luck. Jaahn
    Budge and JohnW like this.

  8. #8
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    Quote Originally Posted by jaahn View Post
    Hi fxhec
    Sorry to hear about your problems again. It is very difficult to diagnose problems on the internet. You do need to find an experienced mechanic close to you to correctly diagnose your problems.

    Getting random suggestion on here is not helping. I did say before that you must find the first cause of your failure last time or you risk having it happen again. I think now that is all I can say to help you.

    Good luck. Jaahn
    Hi
    Sad but true... My engine cuted valve again.
    But I found a problem. My old repairman changed engine porcelain and shaft (?)
    I found original porcelain and shaft. I will change it.
    But engine head is realy problem. Old head was very bad.
    I found a very clear citroen c25 engine head. But is it compatible ? İf isnt ok , my cx goes trash. I'm realy bored this car...


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  9. #9
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    We are having a few translation problems - by "porcelain and shaft" do you possibly mean the rocker gear and camshaft?

    Also "cut" is used for slicing or sawing something. We presume that the valve head(s) broke off the valve stem(s) - is that correct?

    Cheers

    Alec

  10. #10
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    Quote Originally Posted by Armidillo View Post
    We are having a few translation problems - by "porcelain and shaft" do you possibly mean the rocker gear and camshaft?

    Also "cut" is used for slicing or sawing something. We presume that the valve head(s) broke off the valve stem(s) - is that correct?

    Cheers

    Alec
    Porcelain = Cam follower
    Sory for my bad english. For first engine revision, we changed cam follower. Old one has got a corrosion. But we couldn't find a new. Because we compatible another car cam follower. But it has got two hole... I think problem is : this follower.
    Valve drop . Translation problem...


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  11. #11
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    Please don't apologise for your English - I speak no Turkish (or any other language, apart from English & a tiny bit of French).

    Usually we understand what you mean, but sometimes it's safer to tell you that the word you used was not clear. That way we don't waste your time with suggestions that make no sense .

    Cheers

    Alec

    PS - really hope you are able to find the reason for your engine problems, and then find the parts to rebuild it again. You give us motivation to keep working on our cars - if you can do it, then so can we!
    fxheac and Budge like this.

  12. #12
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    Hi again !
    I have good and bad news. My CX on road ! It's working I found engine head
    But now : white smoke exit from exhaust... How can I fix ?
    Thanks for helps

  13. #13
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    Wow - you work fast!
    fxheac likes this.
    1968 DS21bvh Pallas in Gris Palladium

    Restoration blog: https://ds-restoration.blogspot.co.uk

  14. #14
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    White smoke = coolant in the cylinders. Head gasket possibly?
    Cheers,
    John T.

    54 11BL; 61DS19 LHM (son's); 71DS21 BVH; 73SM 3.0; 73SM 2.7EFI; 73SM 3.0 (other son's); 74 Maserati Merak

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    Did you have the head checked for cracks before fitting it ? I think it was not unusual for the diesel CX heads to crack around the exhaust valve seats ? I hope not & that it is just a gasket .
    Richard
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  16. #16
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    Quote Originally Posted by citroenut View Post
    Did you have the head checked for cracks before fitting it ? I think it was not unusual for the diesel CX heads to crack around the exhaust valve seats ? I hope not & that it is just a gasket .
    Richard
    Hi Richard
    I bought engine head and sent engine head service. They cleaned and fix the small cracks. Head is OK
    Gasket ? What will be gasket thickness ? Did you know ?

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  17. #17
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    Hi again
    Cx's turbo revised yesterday. And now white smoke sometimes have , sometimes haven't ... Engine working good now.
    Why exit the white smoke on exhaust ?

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  18. #18
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    Hi

    Sometimes it’s the weather, is it damp and cold where you are?
    It might be some water accumulated in the exhaust which needs to be evaporated away by taking the car for a long drive to get everything fully warmed up (40-50km).

    I trust the coolant level isn’t dropping, no bubbles in the header tank?
    Cheers, Marc.

    1987 CX GTi T2 Maikonics
    1972 SM 2.7 carb
    1972 DS21 EFI

  19. #19
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    There is one sure way to tell, use a combustion leak detector like this:

    https://tinyurl.com/yddjl9pt
    Cheers,
    John T.

    54 11BL; 61DS19 LHM (son's); 71DS21 BVH; 73SM 3.0; 73SM 2.7EFI; 73SM 3.0 (other son's); 74 Maserati Merak

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