ENGINE, FUEL, 4-1. Engine, TM  10-3930-643-34 EXHAUST  AND  COOLING  TROUBLESHOOTING  AND  MAINTENANCE. Fuel,  Exhaust  and  Cooling  Troubleshooting. MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION i. ENGINE CYLINDER COMPRESSION TEST. NOTE Batteries must be fully charged to provide correct cranking speed for compression test. 6. Turn engine through four intake strokes using starter. 7. Read gage and record results. NOTE Increase in altitude above sea level will results. Compression test results should lower compression on test read 335-365 PSI. 8. Release pressure from cylinder through gage and perform the same test to remaining cylinders. j.  INTAKE  MANIFOLD  PRESSURE  BOOST  TEST. 1. Start and run engine until normal operating temperature is obtained, refer to TM 10-3930-643-10. 2. Stop  engine. Remove plug from center of intake manifold on left side of engine and install pressure gage. 4-11