can you refer me to someone with expertise on diesel engine? much better if you could answer my querry, i am planning to buy a toyota lucida which is not running due to cracked cylinder head 2x. the 1st time it happened, the owner replaced the whole engine but then the head cracked again. 3c engine.. i heard that this is the problem with lucida, emina and estima models. Is this problem irreversible? I don't know. We've worked on these cars and don't see overheat to be a common problem.
what should be done to prevent head cracking? Make sure that a thermostat is installed. And check water pump, radiator, hoses, and belts.
Is it advisable to replaced the whole engine or just the head? please advise.. It depends upon the condition of the liners and pistons. Prolonged and intense overheating causes the pistons to over-expand and score the cylinder walls..... lose compression and engine blowby are the results.