Had a "steam train Toyota". a mid 80's, 3k lb model, toyota 5R engine. Would steam up and burn oil after getting up to operating temperature. The root cause was a failed 35 year old head gasket. Pulled it apart, installed new head gasket, fired it up, flushed engine oil system twice and she has been purring like a kitten ever since.
What machine?
Serial number?
Diesel or lpg?