Download the 1931 Instructions for Armourers and the 1991 No.4 manual from The Lee Enfield On-line Knowledge Libraries (Index of Articles) sticky at the top of your forum here and read.
Sunray just gave a good example why you should completely strip your rifles and look them over for problems. A bunch of Enfields were taken apart and all the parts were mixed together and they had problems putting them back together.
My first Enfield came from Turkey, never had a trained British or Commonwealth armourer touch it. And on top of this the Turks cannibalised parts off of other Enfields to keep these rifles in service.
I have spent more time and money collecting Enfield books and manuals than I have spent on Enfield rifles.

Never be afraid to to take your rifle apart.
I can take my Enfields apart in several different languages.