Hi just a thought were all the new valves lapped in properly?
I'm not familiar with Renault diesels but on most timing marks are Flywheel(crank), camshaft, on the camshaft at the back u put in a locating plate that locks the camshaft with the cylinder head. and on the diesel injection pump it is a locating dowel.
Sorry that is the best advice i can give.
debbi
February 2009