Lycoming crankshafts

"Morgans" wrote in message
...

"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote

Same problem in the auto industry. The bigges difference is that broken
cranks or cams or... show up in the warrenty data - not in NTSB accident
reports.

Can you point to a major auto maker's crankshaft recall?
--
Jim in NC

Manufacturer Number Product Reason Country Year

General Motors 150000 Chevrolet, Chevette, PontiacT-1000 Defective
crankshaft U.S.A 0/1986

Mazda 25400 Familia, Laser Danger of crankshaft fracture and engine
damage due to defective bolts WORLD WIDE 7/1990


Suzuki Motor Corporation has determined that the Eiger automatic ATVs were
produced with an internal manufacturing flaw. This flaw could cause the
crankshaft to break during operation. A broken crankshaft will interrupt
power transfer from the engine to the transmission and the drive wheels,
leaving the driver stranded away from his or her base of operation.


My dad had a mid 70's Plymouth that broke 2 cranks in about as many years -
last time he ever bought a Chrysler product. Don't know if there was ever a
recall, or it was just covered under the warrenty.

Plus, if you break, say 0.01% of the crankshafts (1 out of 10,000), would
that trigger a recall for a car? How about for an aircraft? I think the
"threshold" is a lot different.
As suggested by the following:

........ begin quote......
A 'walking' crankshaft is a crankshaft that moves too much inside the
engine. This is also known as excessive thrust bearing play. The movement is
usually due to the crankshaft not fitting inside its bearings correctly.
While not bad for the crankshaft, the movement can place excessive or uneven
loads on the bearings, causing premature failures.

Many 2G owners have suffered from walking crankshafts. It appears that
Mitsubishi built many 2G engines using defective crankshafts, which were
machined out of specification and are thus capable of moving around too much
inside the block. All 2G model years appear to be affected to some degree.

snip

It can be difficult to tell if a particular car is experiencing crankwalk.
Symptoms are usually indirect and difficult to diagnose until major damage
occurs.

snip

Although 2G DSM owners have been anxiously awaiting a recall or TSB on the
crankwalk problem, there is none as yet. According to Paul's second post on
the subject, there may never be a TSB, although some members of DSM Canada
are pushing for one in this thread on their discussion board. As a result,
it is doubly important that affected 2G owners get their bearings (or
blocks, if necessary) replaced before their warranty expires. This might be
difficult for owners of aftermarket clutches, as dealerships often claim the
aftermarket pressure plates are the cause of the problem.

......... end quote ......
--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
Spell checking is left as an excercise for the reader.

Back in the days prior to WWII, a student pilot might expect
to have several genuine engine failures before the license
was issued. Today the engine is pretty good as long as you
put fuel in the tank and oil in the engine [cap secured].
Sometimes you read about a prop strike and they check the
run-out to see if the crank is OK. That doesn't mean the
crank isn't damaged, just that it wasn't left crooked. It
could have been bent 10 thousands left and then back to the
right 12 thou, and be within tolerance. It will break some
time. But some people won't pull the engine down and
MagnuFlux and X-ray the crank and rods because the insurance
company won't pay for it unless they find it's broken.


--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.


"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com
wrote in message
news:WrqdnUxuq4FjS7TZnZ2dnUVZ_tKdnZ2d@wideopenwest .com...
| "Jim Macklin" wrote
in message
| news:tH4Wf.1271$t22.320@dukeread08...
| Unfortunately, people make parts and people are not
perfect.
| All the companies buy parts from suppliers. Rarely a
| suppliers of parts knowingly uses weak materials or
skips
| some step to manufacture. Some times a part is not
designed
| properly and sometimes there is a error such as not
using
| the proper radius on a machine flanged.
| Lycoming and Continental build engines and buy parts.
| Everything gets inspected, all the paperwork is checked,
but
| stuff happens.
| Any manufacturer who designs and certifies a new engine
will
| have the same sort of problems, plus the technology will
be
| new and untried, so there may be problems that are
| unexpected.
|
|
| Same problem in the auto industry. The bigges difference
is that broken
| cranks or cams or... show up in the warrenty data - not in
NTSB accident
| reports.
|
|
| --
| Geoff
| The Sea Hawk at Wow Way d0t Com
| remove spaces and make the obvious substitutions to reply
by mail
| When immigration is illegal, only illegals will immigrate.
|
|

"Montblack" wrote in message
...
("Dave Stadt" wrote)
At this point in time DeltaHawk poses a threat to no one. They have been
in development since before there was dirt and don't seem to ever get
close to having a viable product.

[They do have a real engine flying in a real airplane.

It would be interesting to know how many hours that engine has been in the
air.

http://www.deltahawkengines.com/orders00.shtml
Placing Orders For Engines

"The FAA Certification planning process is underway."
[This surprised me - "planning"?]

Why don't they get some engines out to the experimental folks that have been
waiting eons, develop some cash flow then worry about going through the
arduous and expensive FAA certification process?

"Although work remains on many tasks, we are confident that it will be
accomplished through the continued and by now perhaps legendary
persistence of Team DeltaHawk."
["Legendary persistence" ...a.k.a. 'Around longer than dirt' by Dave]

"Deposits are being used to plan for the initial production volume and
model mix."
[More "planning".]

In other words we have run out of money and are using peoples deposits to
stay afloat. Shades of Jim Bede?

"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote

General Motors 150000 Chevrolet, Chevette, PontiacT-1000 Defective
crankshaft U.S.A 0/1986

Chevette-nuff said! GM's attempt to get into the economy car market, and to
be cheap enough, everything was under-built.

Mazda 25400 Familia, Laser Danger of crankshaft fracture and engine
damage due to defective bolts WORLD WIDE 7/1990

Goes along with my feelings about Japanese cars.

Suzuki Motor Corporation has determined that the Eiger automatic ATVs

ATV's? You have to be kidding. Are we going to count Briggs and Stratton,
also?

My dad had a mid 70's Plymouth that broke 2 cranks in about as many
years -
last time he ever bought a Chrysler product. Don't know if there was ever
a
recall, or it was just covered under the warrenty.

Plymouth had some major issues, during that time. Feel safe to say that
they would not be in the running for aircraft engines, AFAIAC. Was that by
chance a K car engine? Fiasco, from the word go.
--
Jim in NC

"Morgans" wrote:

Mazda 25400 Familia, Laser Danger of crankshaft fracture and engine
damage due to defective bolts WORLD WIDE 7/1990

Goes along with my feelings about Japanese cars.

??

Japanese cars led the revolution in automobile quality; Honda and Toyota are
still the quality standard of the world.

--
Dan
C172RG at BFM

My '91 Honda Prelude had 123,000 miles on it when I sold it. The owner
called and reported that it had crossed 125,000 miles and still going
strong. Only major work was a transmission overhaul, and the usual
maintenance items required, alternator, tires, etc. My current '97
Toyota Camry has 187,000 miles. No major maintenance issues. My American
cars never got that good of service..

Morgans wrote:
"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote


snip


Mazda 25400 Familia, Laser Danger of crankshaft fracture and engine
damage due to defective bolts WORLD WIDE 7/1990


Goes along with my feelings about Japanese cars.


snip

In article ,
"Dan Luke" wrote:

Japanese cars led the revolution in automobile quality; Honda and Toyota are
still the quality standard of the world.

given the design standard of the Element and Scion, I guess Honda and Toyota
must be putting their efforts into quality. :-/

--
Bob Noel
Looking for a sig the
lawyers will hate

"Ross Richardson" wrote in message
...
My '91 Honda Prelude had 123,000 miles on it when I sold it. The owner
called and reported that it had crossed 125,000 miles and still going
strong. Only major work was a transmission overhaul, and the usual
maintenance items required, alternator, tires, etc. My current '97 Toyota
Camry has 187,000 miles. No major maintenance issues. My American cars
never got that good of service..

My Tennessee built Saturn is at 233K miles with no major and almost no minor
work. Too bad GM screwed up something that worked.

"Dave Stadt" wrote in message
om...

My Tennessee built Saturn is at 233K miles with no major and almost no
minor work. Too bad GM screwed up something that worked.

Wasn't the Saturn designed by Toyota, or am I thinking of something else?

We bought a used 1993 Plymouth van with a 3.3 engine from a
friend a few years ago, it now has over 200,000 miles. We
gave our son a 1989 Acura a car we had been using, it now is
running strong at 195,000 miles. He is planning to buy a
new car in the next year or two.

Proper maintenance is the key, whether airplane or car.
Those 18 wheelers often go 500,000 miles.


--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.




"Ross Richardson" wrote in
message ...
| My '91 Honda Prelude had 123,000 miles on it when I sold
it. The owner
| called and reported that it had crossed 125,000 miles and
still going
| strong. Only major work was a transmission overhaul, and
the usual
| maintenance items required, alternator, tires, etc. My
current '97
| Toyota Camry has 187,000 miles. No major maintenance
issues. My American
| cars never got that good of service..
|
| Morgans wrote:
| "Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t
com wrote
|
|
| snip
|
|
| Mazda 25400 Familia, Laser Danger of crankshaft
fracture and engine
| damage due to defective bolts WORLD WIDE 7/1990
|
|
| Goes along with my feelings about Japanese cars.
|
|
| snip