1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 108Get this manual
7The tests in Step indicate the unit is operating normally and the variable ratios are within specifications8If the unit fails any of these tests, check the pulse limiter fitting before replacing the unit9If you replace unit, be careful when removing or installing the hosesDo not damage the plastic hose fittingsUse ratchet style clamp on the oil supply hoseTorque the screws, VRO -to-bracket, to 18-24 inIbs(2-3 Nm)Refer to Hose Routing Chart, this SectionINotel When installing oil supply hose, be sure connections are airtightPoor connections could cause serious powerhead damage Pulse Limiter Fitting
The pulse limiter fitting for the VRO pulse hose has an integral check valveThe check valve is not serviced separately, but must be clean to allow normal operation