2.5 di engine knock second opinion please

[baxta]

i recently replaced my 2.5 di engine in my 96 flareside with another i bought from a mate who seid it was a good engine just lacked a bit of power ,having seen it running in the old van and it was fine i bought it ,after puting it in i went for a drive it was fine at first but after about 10 miles it started to knock loudly, after it cooled down i drove home the same thing happend fine at first then once warm knocked again,
i guess its the bottom end but just wonderd wether im missing somthing befor i rip it out and start again , allso i did read in one of the topics somthing about oiled inlet can nacker the injectors causing a knock anyone know of this? as the engine did fall of the crane (onto my mates head) at one point and oil did leak out the inlet manifold

[jay]

you say u let it cool down...did it get very hot then? this will cause diesel knock
you need to see if the oil pressure is ok when its hot..

[baxta]

no not hot at all , average temp nothing to be concerned about

[chris_gilly]

is the right grade oil in it?
if its two thin when it heats up it wont protect coat everything as it should