vocky said:
I would recommend replacing both chain kits, 100k was the designed lifetime for the chains.
I would certainly consider replacing the water pump, most of them seem to start leaking around 50k anyway
An engine oil change would also be a good idea and perhaps a set of GM triple electrode plugs
Thanks vocky,
I forgot to say, I know that my camchain has been changed at some point during the lifetime of the car, when I took it to Benny he told me it had had a whole new top end (i think the previous owner had a chain snap). Although I dont know if it was done at 40,000 or at 67,000 just before I bought it. As for the balancer, (and whether the cam chain had the new oil nozzle fitted) that's anyone's guess.
I put a new set of triple electrodes on every year when I do the service, same with the oil change. With regards to oil, is it advisable to use a different grade of oil as the engine gets older? I still use 5W30 and it seems to get through a fair bit of it.
Any idea how much a water pump is roughly? Also is it worth doing the oil pump?
Out of interest, how do you know that 100K is the designed lifetime of the chain?