Normal inlet manifold pressure with high exhaust temperature can be caused by blockage in the fins of the aftercooler core assembly. Clean the fins of the aftercooler core assembly.
Low inlet manifold pressure and high exhaust manifold temperature can be caused by any of the following conditions:
Plugged air cleaner - Clean the air cleaner, as required. Replace the air cleaner, as required.
Blockage in the air lines - Blockage in the air lines between the air cleaner and the turbocharger must be removed.
Aftercooler core leakage - An aftercooler core leakage should be pressure tested.
Leakage of the induction system - Any leakage from the pressure side of the induction system should be repaired.
Inlet manifold leak - An inlet manifold leak can be caused by any one of the following problems:
- Loose fittings and loose plugs
- Missing fittings and missing plugs
- Damaged fittings and damaged plugs
- The manifold to cylinder head gaskets
Check all of these items, if necessary.