Disconnect the air cleaner hoses and remove the air box.
Carefully remove dirt from all external surfaces around the economizer.
Remove the two screws, economizer cover, spring and diaphragm assembly.
Remove dirt from the mating surfaces of the cover and housing.
Install the new diaphragm as follows.
Install the spring on the cover of the diaphragm assembly, making sure that the installation is correct, then compress the assembly and the cover. The vacuum hole in the diaphragm must align with the corresponding holes in the cover and housing flange.
Installation is carried out in the reverse order of removal, checking that the diaphragm is installed correctly.
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