what the recommended service or mileage for the timing chain ?

 

personally anytime i have to go into the motor after 100k, i would replace that and the oil pump.

 

What are the symptoms of a timing chain that needs to be replaced?

 

The only symptoms would probably barely be noticeable. If there is slop in the chain, the valve timing(that is the opening and closing of the valves) would float(for lack of a better term) a little bit. You want the valve timing to be at a constant. Most engine builders recommend a double row timing chain.
Cloyes double roller timing chain - The Wedge Shop

 

My D2 gave up on me this week and I was a long way from home. It had been running like a train up until now. The mechanic (who is 600km from where I live) is trying to piece together what happened. 5 out of 8 cylinders have no compression and I think that he suspects that the timing chain is broken. Does anyone know if the timing chain is broken or damaged, the likelihood of damage to valves / cylinders?

 

From what I have read, the rover v8 is an interference motor. Meaning the piston can hit the valves if the chain was to break. Normally, it means there will be some bent valves, and possibly some damaged pistons. Worst case scenario would be bent rods.
Your mechanic sounds right on, in his diagnosis. While timing chains are made to run 200k miles, they can break.

 

Joemamma1954. I think that you have solved the mystery. Many thanks!

Looks like the Disco will be retired if it proves to be the case. I cannot justify a rebuild or new engine in the old girl.

 

That's sad to hear. Would be worth quickly whipping off the cover and checking your suspicions, if you do choose to let it go. Best be certain.

 

if the chain is broke the engine will spin at a crazy rate of speed when cranked