Attached are two pics of the injection pump gear for a 175 diesel. The book says to aline the dot on the gear with the dot on the cam drive gear. The gear in the pic does not have a dot. It has the number 3 and the number 4 on it. I think the number 3 is for 3 cyls and the 4 is for 4 cyls. I would like to verify that before I install the front cover. All help is appreciated.