Califbill wrote:

"Bill Noble" wrote in message
...



Tmning chains seldom wear out, seldom break, and seldom cause your
valves to turn into interesting forms of dramatic scuplture.

Belts on the other hand...shrug..thats what they generally do if you
dont replace them regularly. With some effort, cost and down time.

And since most new engines rely on interference fits for the highest
performance, a slipped or broken belt means a new engine. I'll bet
they went back to chains to be able to do the "100k warranty" thing.



"timing chains seldom ..." - you must be out of your mind - timing chains
always wear out, taking the larger gear with them - I've had to change
them on my 38 plymouth, 36 cadillac, 59 cadillac, and twice on my 51
dodge - newer ones hold up better, but they still go bad - and they are
much harder to change than a belt - I've seen plenty of catastrophic
timing chain failures but the usual failure is not that the chain breaks,
rather that it stretches and cuts the teeth off of the cam gear.

Maybe you should have changed the oil more. The only street car with a
timing chain failure I have had in 50 years was a Chevy Luv P/U. And that
was a tensioner failure.

I replaced the timing chain in a '66 GTO YS 389 V8 engine because the
timing was off. If I had waited, it would have broken. I replaced it
with a double roller sprocket racing chain. It was a quick job, in
spite of one of the Woodridge keys falling into the oil pan. A bent
hanger and 30 seconds of fishing dragged it out. It took under a half
hour, and most of that time was spent scraping off the old gaskets.

That's the only one I've replaced, and I've driven a lot of high
mileage vehicles.


--
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