Hi Mike,
I know for a fact that the timing chains have to be replaced at 100,000 km ( 60,000 miles ) as per the factory maintenance manual ( which is sitting in front of me ). It is the same for the V6 motors.
Here in NZ Coca Cola ( yes even us Kiwis have Coke
) use Zuks exclusively and they run the motors out to the max - the chains let go at around 140,000 km's on average. These motors get really rattly on start up and rattle for quite a while. When they get too bad the chains and guides are replaced ( if they haven't let go already
) , this is a risk they are prepared to take. I believe they get a good deal by not going for warranty - thus the reason for running them for as long as possible. The chains and guides are quite expensive to replace.
Your motor has done 86,000 miles or aprox 138,000 km's so way over due for replacement.
Me - my V6 GV has just gone past 100,000 km so I will book it in to our local Zuk dealer and have them done ( got a 3 year cost free deal when I bought it, so no cost to me
, thank goodness ).
Hope this all helps.
ZeusZuki