i replaced a transit van turbo not so long ago and it fell apart in my hand and this had only had a new engine 2 months bfor and the turbo was checked then so they dont take long to eat them selfs. Aslo if you relly want to scare youself look up run away diesel engine.
water pump might as well try a new on as there only £25,
rad check if its hot all over,
duff new stat, did you test if b4 you put it in,
hg failer if the above has been done go get a sniff test,
slipped liner if its this you dont want to know
i dont think a 17 year old should be able to have a 3tonne truck anyway there should be 21 age limit or sumin like that.
sorry i know its not helpfull to here it but whats going to happen if you crash it due to inexprance whats going to happen to what or who you hit.