Air Pump

Start engine and warm to normal operating temperature. Check all hoses and connections for possible leaks. Replace as necessary and/or tighten connections.
Listen for excessive noise at air pump. Replace air pump if noise is excessive. Check drive belt tension. Disconnect hose from air pump outlet and attach air pressure gauge (49 2113 010B). See Fig 1 .

Fig 1: Checking Air Pump Pressure Replace air pump if pressure is less than 1.0 psi (.07 kg/cm2) at 1500 RPM.
Connect tachometer to engine and run engine at 1500 RPM. Note pressure reading. Pump pressure must be at least 1.0 psi (.07 kg/cm² ). Replace air pump, if reading is less than specifications.