Had same problem with my 300tdi, when the engine was cold it had good oil pressure. when it had warmed up oil pressure dropped off rapidly (20psi). Eventually I found it was crud in the head of the oil pressure relief valve. There is a natrural restiction where there is a support bar for the...

300tdi, low oil pressure when engine at normal running temp

300tdi low oil pressure when engine has warmed up. I am hoping this thread may help others. When my engine had warmed up the oil pressure dropped off to about 20psi at 2000rpm. I changed all normal things i.e. oil filter,water thermostat, radiator, oil pressure relief valve, big end shells...

Does anyone know the size and thread type used on the top of 200tdi and 300tdi injectors. I know that the across flats size is 17mm, but the threads seem to be BSP of some sort. I am trying to make up a injector pressure tester and need to know the size to order the unions. I will be using a...