All basic stuff to restore normal operation. Time consuming but not bad.
Here is a partial list:
Rotor (Inspect tip and for tracks away from tip)
Distributor Cap (Inspect electric connections and for cracks)
Timing (Check / set per FSM)
Spark Plug Condition (Insulator Visual to Indicate Burn, Ceramic Cracks)
Spark Plug Gap
Measure spark plug wire resistance
Compression
Fuel Pressure (Multiple / All Test Conditions)
Send Injectors for Testing / Cleaning
Engine Fault Codes
All Vacuum Hoses Clean / Clear (Mine are Cleaned Annually)
Flame Arrestor Clean (Mine is Cleaned Annually)
New Fuel Filter(s) (Mine is Replaced Annually)
Remove / Inspect / Clean / Replace Intake Plenum (Mine is Cleaned Annually)
The excess heat can be a number of things, like bad impeller or failing exhaust.
Try unbolting the exhaust elbow from the riser to permit a visual inspection of the internal raw water passages and to permit an inspection of the SOLID wall thickness between raw water and exhaust gas passages. A replacement gasket is required for reassembly.
