Hey guys, my defender has broken down and do not know where to start troubleshooting. It was driving normally until I turned it off for 15 mins and when I turned it back on it had a bad knocking sound coming from the engine bay, I thought I might make it home, started driving and the noise got louder and eventually engine cut out about 5kms down the road, had to get a tow truck back home. It still cranks over, It is a 1996 300tdi with 260000kms on it. Any help would be much appreciated, thanks.