Hi - have a 4.2 t/d- intercooled , all standard .... 170K on clock - serviced regularly .... Sudden loud rattling & stopped , mechanics all said injector pump but no - #4 cylinder down 100 psi on comp test .... I thought had dropped a valve ... rocker cover lifted & all ok ......so head coming off ... could be $10K repair ... any suggestions re usded motor or rebuild ?
Cheers