V40 1.8 90KW Bj 2001 Engine turns but does not start!

Good day dear people! I have the problem that my V40 doesn’t start any more! To the background: After a normal ride into the city the vehicle was turned off;by letting it go again, a bad clack came out of the engine compartment (he has done sporadically already many times) I suppose it came from the camshaft adjustment! So engine off and since then the engine turns when it jumps through but not on!Zündfunke is there!But it sounds as if he does not build up compression at the start! Can someone help me?