How do you know when you have a bad injector and how do you figure
out which one it is?
Gordon

On Sat, 25 Apr 2009 07:52:32 -0700, Gordon wrote:

How do you know when you have a bad injector and how do you figure
out which one it is?
Gordon

A bad injector will usually cause a miss, or rough running. A field
check is to run the engine at idle and loosen one injector pipe
connection at a time. Loosening the connection on a good injector will
cause the engine to miss or run rough. Loosening the connection on a
bad injector will change nothing.

However.... Injectors can be set at the wrong opening pressure or have
a defective spray pattern that may not show up using the above check
and can only be found by removing the injectors and having them tested
at a shop that specializes in repairing fuel system components.


Cheers,

Bruce in Bangkok
(bruceinbangkokatgmaildotcom)

"Gordon" wrote in message
m...
How do you know when you have a bad injector and how do you figure out
which one it is?
Gordon


Remove the spark plug wire one cylinder at a time. The spark plug wire
removed on the cylinder with the bad injector will not cause an additional
miss.

Wilbur Hubbard

"Wilbur Hubbard" wrote in
anews.com:

"Gordon" wrote in message
m...
How do you know when you have a bad injector and how do you figure
out
which one it is?
Gordon


Remove the spark plug wire one cylinder at a time. The spark plug wire
removed on the cylinder with the bad injector will not cause an
additional miss.

Wilbur Hubbard




Wilbur, or whatever name you're using today.....How many diesel engines
have you ever actually touched?



--
-----
Larry
You can tell there's very intelligent life in the Universe
because none of them have ever tried to contact us.....

"Larry" wrote in message
...
"Wilbur Hubbard" wrote in
anews.com:

"Gordon" wrote in message
m...
How do you know when you have a bad injector and how do you figure
out
which one it is?
Gordon


Remove the spark plug wire one cylinder at a time. The spark plug wire
removed on the cylinder with the bad injector will not cause an
additional miss.

Wilbur Hubbard




Wilbur, or whatever name you're using today.....How many diesel engines
have you ever actually touched?

http://www.indianindustry.com/engineparts/2815.html

Diesel engine spark plugs! Gotcha, Larry.

Wilbur Hubbard

In article s.com,
"Wilbur Hubbard" wrote:

"Gordon" wrote in message
m...
How do you know when you have a bad injector and how do you figure out
which one it is?
Gordon


Remove the spark plug wire one cylinder at a time. The spark plug wire
removed on the cylinder with the bad injector will not cause an additional
miss.

Wilbur Hubbard

Jezze Louise, Wilbur, are you really this stupid? Spark Plugs on a
Diesel Engine? There actually IS one design that does have this
arrangement, but International Harvester hasn't built one in 50 years....
and when in Diesel Mode, the Spark Plugs are not used.....

You wrote:
In article s.com,
"Wilbur Hubbard" wrote:

"Gordon" wrote in message
m...
How do you know when you have a bad injector and how do you figure out
which one it is?
Gordon

Remove the spark plug wire one cylinder at a time. The spark plug wire
removed on the cylinder with the bad injector will not cause an additional
miss.

Wilbur Hubbard

Jezze Louise, Wilbur, are you really this stupid? Spark Plugs on a
Diesel Engine? There actually IS one design that does have this
arrangement, but International Harvester hasn't built one in 50 years....
and when in Diesel Mode, the Spark Plugs are not used.....

Ok Wilbur, I got the sparkplugs out of my Westerbeke diesel but I'll
be damned if I can set the gaps. Can you help me please?
G

"Gordon" wrote in message
m...

Ok Wilbur, I got the sparkplugs out of my Westerbeke diesel but I'll be
damned if I can set the gaps. Can you help me please?
G

The gap on Essie's diesel spark plug is about three feet. I keep the
sparkplug in a drawer in the cabin, and it apparently works by induction,
with no visible power source. I'm assuming it uses Zero Point energy.

--
KLC Lewis
www.cafepress.com/tmen
www.zazzle.com/klclewis
www.KLCLewisStudios.com

On Apr 26, 3:35*pm, You wrote:
In article s.com,
*"Wilbur Hubbard" wrote:

"Gordon" wrote in message
om...
* How do you know when you have a bad injector and how do you figure out
which one it is?
*Gordon

Remove the spark plug wire one cylinder at a time. The spark plug wire
removed on the cylinder with the bad injector will not cause an additional
miss.

Wilbur Hubbard

Jezze Louise, Wilbur, are you really this stupid? *Spark Plugs on a
Diesel Engine? *There actually IS one design that does have this
arrangement, but International Harvester hasn't built one in 50 years....
and when in Diesel Mode, the Spark Plugs are not used.....

My grandfather had one of those. It was actually a dual fuel engine.
Gas was used
to warm it up, after about 5 minutes you simultaneously shut off the
gas and
opened up the diesel flow, a two handed operation that took a bit of
practice.

Gordon wrote in
m:

How do you know when you have a bad injector and how do you figure
out which one it is?
Gordon


YouTube is your friend!
http://www.youtube.com/results?
search_type=&search_query=diesel+injector+testing& aq=5&oq=diesel+injec

How NOT to test injectors:
http://www.youtube.com/watch?v=_gUB81VfK40

Bad spray pattern from crap in the injector will make one cylinder knock
really loud. There's ALWAYS one injector that knocks louder than the
rest and that's just "normal". Same thing is true if the metering
circuit doesn't close right, bad springs, etc. That cylinder pulls lots
harder than the others from the supercharge of fuel.

A clogged injector simply has no fuel spray so the cylinder either never
fires at all and the engine goes on "humping" past the dead cylinder's
compression stroke never having a power stroke or the engine runs like
crap because that cylinder isn't pulling its share of the load,
virtually putting the engine in idle when it's the bad cylinder's turn
to fire.

Testing is pretty easy. All this runs on very high pressure, but very
tiny amounts of fuel. With the engine running under load, underway,
simply take an appropriately sized wrench and crack open the fuel
supply fitting to each injector, one at a time, while listening to the
results as you add yet another cylinder that isn't firing. When you
come to the one that's not firing or is overfiring, when you crack its
fuel line the engine runs the same....or that awful knocking from too
much fuel stops. When you open the good injectors, adding to the
problem, the engine runs much worse, now that it has two cylinders dead
instead of just one.....

When you think you've got it, shut her down and swap that injector with
a spare I just KNOW you have in your spares locker, right? You DO have
a calibrated torque wrench and know how to use it so you can set the
torque on the nuts correctly, right? No? Get one. Harbor Freight's
cheap Chinese torque wrenches are amazingly close to correct....closer
than the Snap-On ones we tested for lots more money.

If that fixes it, you found it. If nothing changes, you'll know we have
injector pump problems you can't fix at sea.

BTW, Harbor Freight also has fuel injector testers, the kind you attach
to the injector then pump by hand so you can see the spray pattern of
fuel coming out of them....very handy for testing injectors.

What make/model of engine are we testing, anyways?? Doxfords wouldn't
use this kind of test:
http://www.youtube.com/results?searc...y=doxford&aq=f



--
-----
Larry
You can tell there's very intelligent life in the Universe
because none of them have ever tried to contact us.....