Table 5-1. Direct and General Support Preventive Maintenance Checks and Services
M = Monthly
A/R = As Required
Q = Quarterly
H = Hourly
ITEM TO BE INSPECTED
NO. M A/R
a. Check crankcase vacuum. Use vacuum gage.
The engine must be running to check crankcase vacuum.
Figure 5-2. Installation of Vacuum Gage
Remove plug dipstick.
Insert vacuum gage into dipstick hole. Make sure it seals well.
Start engine and test vacuum.
If vacuum is /2 - 1 inch (12.7 - 25.4 mm) of mercury the engine is ok.
If vacuum is less than 1/2 inch (12.7 mm) of mercury, check crankcase breather.
If there is a positive pressure in the crankcase, check engine compression.
b. Check crankcase breather assembly.
Remove valve cover and gasket.