the chain guides wear out on the 4 cyl model
also the cogs wear out due to the chain tensioning system design
at that high a km you need
a timing chain kit with cogs from ebay repco or bursons
or you can go furthur with a balance shaft elimination kit
the motor has to come out for that
and you need a TP motor oil pump
it is easier to do with the motor out to do the timing chains
but some do it with the motor in or drop the motor down to the ground
the chains are self adjusting on the TR motor
but you could try undoing the little plate on the timing cover near the alternator
got more info in this link and pictures
http://www.mitsubishiclubaustralia.com/for...opic.php?t=1679