Note: Before you start, see Chapter 2.
Removing
1. Disconnect the negative cable from the battery.
2. On early models, remove the air filter. On late models, disconnect the main air line from the air filter, then disconnect the vacuum pipe and breather hose from the air unit. Unscrew the three fastening screws, remove the air unit together with the main air duct.
3. Thoroughly clean the outside of the economizer valve housing.
4. Unscrew the two fastening screws, remove the economizer valve assembly cover, spring and diaphragm.
Installation
5. Clean mating surfaces of lid and housing.
6. Position the correctly oriented spring on the cap and diaphragm assembly, then press the diaphragm assembly and cap together. Note that the vacuum hole in the diaphragm must align with the corresponding holes in the casing flange and cover.
7. Further installation is carried out in reverse order, but check that the diaphragm is correctly placed (see illustration).
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