Bill:
Timing chains, usually duplex in higher output engines, are not immune
to either stretching or breaking. Stretching is OK, as long as the
tensioner has enough movement to compensate. If not, the chain slaps
around, grinding away anything it touches. I would assume the shorter
the chain, the easier it is for the tensioner to do its job. That being
said, the chain on a single/twin OHC V8 (don't know what you have in
your Lexus) can be surprisingly long. Older MB V8s (e.g. in 560 SLs)
have duplex chains measured in feet that assuredly do stretch.
Recommended to change them at or before 100 000 miles - for obvious
reasons (especially in the case of zero-clearance engines).
Martin
On 01/12/2016 4:27 PM, Bill Pearce wrote:
The utter stupidity of this is that we are tied to regular, expensive
replacement of something that contributes only to our comfort, which
shows me how soft we have become. Several years ago, I sold my Audi to
get out from under the nightmarishly expensive repair and maintenance
bills that are the gift of German engineering. It, like most of the
cars I've owned since the seventies, had a timing belt. I replaced it
with a Lexus. I asked the person from whom I bought the car, who was
also my long time mechanic, about timing belt replacement, and he said
"Never!" When I recovered consciousness, he explained that it had a
timing chain, I said Thanks for Japanese cars! The only purpose for a
belt instead of a chain is to remove a bit of noise, making the inside
of the car more silent. I certainly can't tell a difference. Maybe I
should get my hearing checked.
1. My Lexus isn't afflicted with a lot of engine noise.
2. If noise is a problem, there needs to be more work on tires.
-----Original Message----- From: Jim Nichols
Sent: Thursday, December 01, 2016 3:02 PM
To: Olympus Camera Discussion
Subject: Re: [OM] Wyoming in August [was other stuff]
Hi Ken,
As I understand it, at least you don't have to worry about a timing
belt. I suspect yours has a chain.
I've got a more unique situation with my 2007 Volvo V70T. Shortly after
buying it, a combination of advancing age and health concerns curtailed
our traveling. It turned over *8000* miles last week. So, on my next
dealer visit, some time next year, I'm faced with age-related items.
I've got to replace the original tires, tire-pressure sensors, etc,
along with the usual once a year oil change and servicing. The sensors
are powered by batteries inside each tire, with a life expectancy of 10
years. I expect that my timing belt should also be changed after the
recommended 10 year life.
Alas, such is the care and feeding of our mechanical pets............
Jim Nichols
Tullahoma, TN USA
On 12/1/2016 1:54 PM, Ken Norton wrote:
Speaking of the BMW, I've got to replace the water pump, belt and
power steering tank. Have all the parts ordered and will do it myself.
First "major" repair to this thing, like ever. 2004 with 165k miles.
Better get rid of it, I guess. (The original battery lasted 12 years).
AG Schnozz
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