Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
TEST OR INSPECTION
Figure 5-90. Installation of Vacuum Gage
The engine must be running to check the crankcase vacuum.
Remove crankcase plug-dipstick.
Place vacuum gage in dipstick hole. Make sure it seals well.
Test the vacuum.
If the vacuum is 1/2 inch to 1 inch (12.7 mm to 25.4 mm) of mercury, the engine is ok.
If the vacuum is less than 1/2 inch (12.7 mm) of mercury, go to Step 9.
If there is a positive pressure in the crankcase, go to Step 10.
Check the crankcase breather assembly.