1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 91Get this manual
[!!] Place vacuum passage O-ring into cavityG2l Apply OMC Triple-Guard grease to one end of the poppet spring, and install greased end onto the air motor diaphragm's poppet valve(The grease will help stabilize the spring while assembling
Install the air motor spring onto the air motor diaphragm