Lycoming crankshafts

"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

"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.

"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

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.
|
|

I don't know about anyone else, but Lycoming's latest dirty trick with the
crankshafts...

What "dirty trick"?

Jose
--
Nothing takes longer than a shortcut.
for Email, make the obvious change in the address.

"Jose" wrote in message
m...
I don't know about anyone else, but Lycoming's latest dirty trick with
the
crankshafts...

What "dirty trick"?

If a company admits that they have manufactured a faulty part, then they
should be replacing it, free of charge, including any labor to replace it.
If they do not stand behind their product, and expect the customer to pick
up the tab, I call that a dirty trick.

What do you call it?
--
Jim in NC

...I call that a dirty trick.

What do you call it?

It doesn't matter. I was unaware of the root news item.

Jose
--
Nothing takes longer than a shortcut.
for Email, make the obvious change in the address.

What do you call it?

Aircraft maintenance....