I mentioned mine went at 105K. Actually chain broke straight across all 7 links. Seems that a dealer in US ( confirmed dealer services in owner's manual) replaced the waterpump and put a long bolt in wrong place ( for a short time ) and broke the inside reinforcement around bolt , probaly tried to start engine, then changed bolt after which the engine could turn over. After a while the broken aluminum bits wedged in the chain and broke three teeth on the crank gear which then messed the timing. After a while the chain continued to fall apart and scraped the inside of the timing cover, luckily not enough to go through before it fell apart and bent a valve. Some US techs must be under pressure to get done on time and not to watch the details on re-assembly. Never understood these time issues as I worked for a Jag shop and could get done under time and not forget a single bolt or washer. My Discovery has 112K and runs quite well. I did change the timing chain and gears in my 88 RRC for 110K maintenance and the chain was getting loose.
96 4.0 Discovery 1 ( 9 yrs )
96 4.6 HSE Range (4 yrs )