I have a 2006 Yukon Denali with the 6.0 engine with 12K miles. I recently
started hearing a knocking sound when the engine is cold. Has piston slap
been reported on these engines? Please tell me no since I have this with my
Can't anyone make an engine anymore that doesn't knock?
Not true, it was worse back then but can still be a issue today due to
acceptable production tolerances to meet quotas and control costs.
Using 10w30 instead of 5w30 will help and reserve 5w30 for temps
consistantly below zero (F)
Because They Know that PEOPLE will not do their Research before Buying a
one way to Guage a Vehicle's Quality, Is To Go around the to the Back of
The DEALERSHIP around 8am and See How many Cars & Trucks are lined up
For SERVICE ! The Service Department with the Shortest lines is The
Vehicle You want to BUY !
And all those Cars ARE NOT Getting their oil changed, only About 10%
If you look at a GM manual for 20 or 30 years ago on prodution
tolerances on engine internals you will see that today they have a
larger gap or spread as to what is acceptable than they did back then.
If you have the misfourtune to get a engine that the bores are at the
large end of the tolerance and pistons that are at the small end
together in one engine they can slap/knock. Gone are the day when they
would closely fit pistons to bore because labors costs are too high.
Really? Better dig out your 20-30 year old manuals and tell me
what the piston to cyl clearance was. (production, not service)
In the case of a 5.3 v-8 in 2006, the gm spec is:
a.. Piston - Piston to Bore Clearance - Production
-0.036 to +0.016 mm
-0.0014 to +0.0006 in
Look at that! A negative number! See if the 20-30 year old manuals
come close to that tolerance!
I have looked and while I have not looked at a 06 spec recently I have
older ones (05 on back). I nknew a few guys that used to work in GM
engine plants in 60's through 80's and they told me how they used to
take time to get it right and fit each part and get each bearing right
one but that started to fade out in later 70's and by the today, the
parts are slaped together whether they are the correct fit or not with
no time to hand fit them like they did long ago when they would have
pistions batches of different sizes that they would match to bore if
need be. SOme blame shorter skirts which has some effect but the
bottom line is "IF" they would take the time to fit them properly from
day one there would be no slap but with todays labor cost making up
about 70% of the cost of a vehicle they are hard pressed to use as
little extra labor as possible. You can put spec in a book but
following them is another matter at time and it would be interesting
to tear down a engine that is slapping a lot and measure the bore and
the piston. It is very very rare to see slap in a import motor because
they spend more care and man hours building it.
Which sand pile have you had your head in???? This is VERY common
knowledge in automotive industry and trade news. In 2005 health
insurance alone added 1500 dollars to the price of a new GM vehicle.
GM is bleed very badly from labor costs and if they do not get them
down by 2010 they will be doomed to going out of bussiness because the
market will nolonger support the product prices need to continue to
support high labot costs as it has reached critical mass.
I will not waste my time to find something that has been known for
over a year now. IF you do not believe it prove it otherwise. The fact
that you do not shows you are not well informed. I make it my
bussiness to keep track of these things and others. Why do you think
GM is spending a fortune on early buyouts? It is because it is cheaper
to buy them out than to keep paying them long term. How long do you
think they can stay profitable when they average labor cost per man
hour (wages, insurance, benifits and paid time off) is over $70/hr???
I know a few guy that own factories that make parts for GM and they
want them as cheaply as possible to offset high internal costs but
things have reached their limt when SUV and fuel prices rose to
current levels. Detriot will not servive long term if they cannot get
costs down and quality up. The writting is on the wall for those who
choose to see it. .
What the idiot meant to say is: "For some time I have posted mostly BS info
on the internet. When questioned about the BS info, I ignore the question
and continue to post more BS info.Why would you expect me to stop my usual
I agree that trying to substantiate your statements would be a waste of
time, but the real waste of time is in reading your posts. You do, however,
have some entertainment value. Keep up the good work.
Only because you want to believe otherwise. I realy do not care if you
do not beleive it as you are free to keep your head in the sand.
People that track industry and markets know this so I guess you do
neither or do so poorly. Again new car equals 30% raw materail cost
70% labor cost for GM in 2005. I have not seen figures for 2006 yet
because they are not out yet. The colapse of the past high profit SUV
market has knocked the socks off and put books in red big time. Write
it on the wall, GM is either going to bust up labor union wages or
bust up company in next 3 to 5 years tops because it cannot survive
much longer on credit.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.