Crankcase Vacuum Graph. Exhaust Temperature Graph. Lube Oil Pressure Graph. Scavenging Pressure Graph. Rack Setting Graph.
All indications point to a definite internal problem in one cylinder.
The logs should now be consulted to find the problem cylinder and initiate appropriate repairs. If only firing pressures and exhaust temperature are low, the fuel system should be checked on the problem cylinder. As long as everything is normal, this curve will also be flat. A cracked piston, worn rings, or liner will increase blow-by, causing decreased crankcase vacuum. If crankcase vacuum decreases with no change in other indicators, the crankcase scavenging system should be checked for proper operation.