I am now able to return to matters bus-related.   I started the week by washing out and heat drying the fuel filter bowl which had been pickling in white vinegar for a couple of weeks.  This effectively removed all the detritus and rust from within the filter bowl, ready for a coat of thick oil to be applied and a new filter made.  Next, I gave it two coats of No.1 rust beater.    Work continued on the rear brake servo, which is now fully dismantled, with the exception of the distributor valve which will receive attention later.   With the piston removed, it is apparent that the leather seal is worn and needs replacing.  The cylinder body itself has been thoroughly cleaned out to remove the thick, solid deposit in the bottom and it is clear that the servo piston has received no lubrication for many years.

Final job of the week was starting to remove the accumulated mud from the chassis behind the servo.