I was wondering where the injection pump filter on a 78 240 D is located. I know what the pump itself looks like. I just don't see a place for the filter The repair manual I have reads as follows "If no oil flows from the check bore, unscrew the filter and add engine oil up to the check bore.". They did not include an illustration with the istructions.

There is a bell shaped housing on the top of the injector pump that I tried to remove. I did not try to hard because I was afraid it might not be meant to come off.

Also strange is the fact that my Performance Products catalog does not have an ijector pump filter listed in it. Is my Chilton's repair manual wrong? If so what manual should I buy. Please help I am clueless.