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Old 01-09-2013, 03:59 PM   #11
Sasha2006
 
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Default Re: Injector Leak-off Test

this was my first time trying this test. Here are my results
Injector #1 - 1/2 inch
Injector #2 - 3/4 inch
Injector #3 - 5/4 inch
Injector #4 - 1/2 inch
Injector #5 - 5/8 inch
i am wondring what is the amount of fluid; to consider replacing the injectors?
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Old 01-09-2013, 05:00 PM   #12
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Default Re: Injector Leak-off Test

Quote:
Originally Posted by Sasha2006 View Post
this was my first time trying this test. Here are my results
Injector #1 - 1/2 inch
Injector #2 - 3/4 inch
Injector #3 - 5/4 inch
Injector #4 - 1/2 inch
Injector #5 - 5/8 inch
i am wondring what is the amount of fluid; to consider replacing the injectors?
I can see how you could miss this the first time

Quote:
Originally Posted by Type2Teach View Post
<snip>
10. Crank the engine for a full 10 seconds- it won't start because you have your cam sensor unplugged.
11. Check for one or more tubes that are overly full. Andy told me that 2.5ml or more fuel in the tube meant that it was time to replace the injector. I just measured this and in that 3/8" tube on the injector, That would be right at 1 and 1/2" or 37mm for the rest of the world.
<snip>
More than 2.5 milliliters in the tube, which is about 1.5 inches of fluid depth in a 3/8-inch tubing.....

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Old 01-09-2013, 11:24 PM   #13
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Default Re: Injector Leak-off Test

thank you for your reply, I did crank the engine for 10 seconds. And that was my result; but yea I must of missed number 11. looks like my injectors still have some life in them.
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Old 05-04-2013, 01:15 PM   #14
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Default Re: Injector Leak-off Test

Finding a thread like this gives me delusions of being able to do mechanical things to my van
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Old 06-07-2013, 03:29 PM   #15
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Default Re: Injector Leak-off Test

did you clamp the return line? I can't see it in pic and without that would give mixed results at best.
"using 3/8" tube look for more than 1.5" of fluid (this is too much, less ok)
yours looks low(i.e. O.K.).
but then there are more than one type of injector leak, the injector it self (leaking diesel to the external area), the pressure circuit within the injector leaking pressure into the return circuit (this test), and compression seal leakage past and around the injector (resulting in black death (coke built up under top cover)....
Step right up & roll the dice, which do you have?
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Old 10-23-2013, 05:27 AM   #16
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Default Re: Injector Leak-off Test

For my non metric friends that are challenged to measure the amount of diesel in the tube. 2.5 ml = 1/2 tsp. Or you could use google to search to their calculator: ml to tsp conversion
I found it easy to plug the end of the tube and pour in 2.5 ml of water to see the location of the amount, it won't be the exact place on the tube because the tube fits into the injector, but at right around 1 1/2" from the plug point should be the max level talked about. One could always use an eye dropper and suction out the diesel and measure into a 1/2 tsp measuring spoon that you did not get from the kitchen drawer
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Old 06-08-2014, 02:02 AM   #17
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Default Re: Injector Leak-off Test

Thanks for the clear write-up!
Helped me to diagnose a surging idle and stalling problem.
Looks like injector #3 has to be replaced.
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Old 07-26-2014, 05:15 PM   #18
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Default Re: Injector Leak-off Test

Thanks for posting this, I've been dreading the diagnostic cost for years after starting to detect a slight miss.
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Old 08-29-2014, 07:25 PM   #19
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Default Re: Injector Leak-off Test

Quote:
Originally Posted by Type2Teach View Post
Do you think you have a bad injector? Here's a VERY simple test you can do to determine if you have one or more injectors that are already dead or on their way out.
In fact, it's SO simple that while you are doing regular maintenance, it might be a good idea to check the injectors before one leaves you stranded. And from what I've read on the list, it's WAY easier to get injectors out of a hot engine than a stone cold one.
1. Purchase 3/8" ID clear tube from home depot- 2ft
2. Cut it in 4" lengths.
3. Take injector cover off
4. Pull clips off of each of the return fittings on top of the injectors
5. DON'T LOOSE THEM (I keep a clean peanut butter jar with lid around just for this purpose- they store the cut sections of tubing in them when not holding the clips)
6. Carefully pull the return line plastic fittings up and off the injectors (they can break- I've never broken one, but I have read on the forum that the only source for them is Andy)
7. Unplug the Cam sensor (next to injector #5)
8. Fit one tube over each injector head
9. Using a vice grip and cardboard, pinch the fuel return line BEHIND the "T" for #5 injector- fuel can come backwards out the fittings and you can have a mess on your hands.
10. Crank the engine for a full 10 seconds- it won't start because you have your cam sensor unplugged.
11. Check for one or more tubes that are overly full. Andy told me that 2.5ml or more fuel in the tube meant that it was time to replace the injector. I just measured this and in that 3/8" tube on the injector, that would be right at 1 and 1/2" or 37mm for the rest of the world.
Here's a picture of an obviously bad injector followed by two pictures of the same engine (mine) with the #2 injector replaced and other injecters following suit after about 500 miles.
Will this same process work on a 07reg 311cdi engine?
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Old 08-29-2014, 07:46 PM   #20
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Default Re: Injector Leak-off Test

Quote:
Originally Posted by load2go View Post
Will this same process work on a 07reg 311cdi engine?
Yes all Common Rail Direct Injection systems will work this way
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