Toyota Repair: Oil in cooling system, toyota caldina, head bolts

Question
Thanks
Yes vehicle is a auto but the oil i am getting in the rad is engine oil not auto trans fluid
motor is over head cam 4 cylinder
diesel motor
motor is a called a 2c toyota motor

any other idea's with this new info?

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Followup To
Question -
Hi i have a
1994 toyota caldina
motor is a 2c
chassic is a ct190
model ius a x ct190g

my problem is i am getting motor oil in my radiator.
i thought it was head gasket blown or cracked head, got head removed and cracked and pressure tested and replaced head with new gasket and head bolts and i am still getting motor oil in my cooling system and after heaps and heaps of flushes and radiator being stripped and flushed out so no oil in there it keeps coming back.  
what could the problem be?

J-R
Answer -
The model number etc. doesn't mean anything to me, you obviously reside in another country where this information is different than in the US,if the car has an automatic transmission the oil may be entering into the cooling system from a leaking oil cooler in the radiator, engine oil can enter into the coolant if the emgine has a timing chain and it is worn and has damaged the timing cover on the inside, without knowing exactly what I'm dealing with it is the best advice I can give at this time.

Answer
Toyota stopped selling diesel equipped vehicles in the US in 1987, I have almost no information available, there may be a problem with the timing chain, if it has one, so have it checked, if it is worn it may have rubbed through the timing cover so that coolant can enter from the water jacket into the engine oil.