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Testing Piezo injector leak-off #

Posted by Eamonn Greene on August 6, 2013, 10:13 pm

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Hi Techs
Would someone guide me please as to how one checks the leak off on CR Piezo Injectors.
I purchased the Sealey Kit today but it comes with no instructions.
What pressure can one expect for a good Piezo injector and what pressures would indicate a faulty injector.
Also I notice the gauges measure negative pressure as well....negative pressure on a return line????

Thank you very much.
Regards
Eamonn

Re: Testing Piezo injector leak-off

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on August 7, 2013, 7:24 am, in reply to "Testing Piezo injector leak-off"
Mark Carter

What make are the injectors?

Do you want to look at the line pressure or the return rate (not pressure)?

Are you sure your "kit" will work with Piezo Injectors?

Is it just a low pressure supply line gauge kit?

Mark

Modern cars, Its all wizardry and witchcraft

Re: Testing Piezo injector leak-off

Posted by david evason <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3433' width='330' height='300' border=0 style='border:none;'> on August 7, 2013, 7:49 am, in reply to "Testing Piezo injector leak-off"
David Evason

Does this help at all
http://www.toolbox.co.uk/link/1/VS2050.pdf

Re: Testing Piezo injector leak-off

Posted by Eamonn Greene <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5362' width='330' height='300' border=0 style='border:none;'> on August 7, 2013, 9:59 am, in reply to "Re: Testing Piezo injector leak-off"

Thanks guys for your replys.
I don't quite understand what you are saying Mark.
Bosch and Siemens have a back pressure of 10 bars and Delphi 3.5 bars.
I was interested in what tolerances are allowed....would 12 bar be acceptable on a Bosch system for example.
Would 8 Bar be acceptable etc.
What is the time-factor concerning this pressure build up whilst cranking?
I can find no info on-line at all.

Thanks David that particular info came when I purchased my kit but it's very basic.

Thanks again,
Eamonn

Re: Testing Piezo injector leak-off

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on August 7, 2013, 1:01 pm, in reply to "Re: Testing Piezo injector leak-off"
Mark Carter

Oh, that makes sense now.

what pressures have you got ? what the issue with the vehicle and what is the history of the vehicle?

Mark

Modern cars, Its all wizardry and witchcraft

Re: Testing Piezo injector leak-off

Posted by Tony Powell <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1632' width='330' height='300' border=0 style='border:none;'> on August 24, 2013, 10:10 am, in reply to "Re: Testing Piezo injector leak-off"

All the Bosch dealers I do work for tell me that there is no testing scheme for the piezo injector as yet
Bosch are also well known for not releasing information so I think anyone giving it out is either talking from comparison they've done or guessing
So the answer is probably nobody knows for sure!!

Tony

Link: Seized injector removal specialists

Re: Testing Piezo injector leak-off

Posted by martin wainwright <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1293' width='330' height='300' border=0 style='border:none;'> on August 26, 2013, 10:39 pm, in reply to "Re: Testing Piezo injector leak-off"
Martin Wainwright

[url=

this Bosch Piezo injector has a backleak fault

Regards

Martin.

Re: Testing Piezo injector leak-off

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on August 27, 2013, 12:58 pm, in reply to "Re: Testing Piezo injector leak-off"
Mark Carter

I have seen between 6 & 13 Bar on the bosch systems. I belive the spec is between 8 & 12 Bar.

Mark

Modern cars, Its all wizardry and witchcraft

Re: Testing Piezo injector leak-off

Posted by Tommy Forrest <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1706' width='330' height='300' border=0 style='border:none;'> on September 3, 2013, 8:05 am, in reply to "Re: Testing Piezo injector leak-off"

Mark you are spot on with the spec.

Technical data from Bosch states a pressure of between 8 & 12 Bar, although it can take several minutes of cranking to reach pressure.

Tommy

Link: Injector Removal Service

Re: Testing Piezo injector leak-off

Posted by Eamonn Greene <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5362' width='330' height='300' border=0 style='border:none;'> on September 26, 2013, 11:09 pm, in reply to "Re: Testing Piezo injector leak-off"
Eamonn Greene

Thank You Guys for the info. Sorry for the very late reply.
Eamonn

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