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jfh



Member Since: 08 Jan 2014
Location: West Coast
Posts: 359
South Africa 2007 Defender 110 300 Tdi SW Chawton White
Testing of 300Tdi injectors
Hi.
Can anyone help me with more information about the testing of the 300Tdi injectors.
I might have the equipment, old injector tester, and clean environment to do this but need to know if it's doable for non-bocsh people.
Post #808711 4th Jan 2020 3:21pm
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sako243



Member Since: 08 Jul 2014
Location: Wales
Posts: 1223
Wales 1994 Defender 110 300 Tdi CSW Alpine White
Injector pressures are given in the workshop manual:

The main thing with them is that they all crack off at a similar pressure (better to have them even and low or high rather than uneven across the board) and you get a nice clean jet coming out of all four orifices (I think it's four, can't quite remember).

A friend in Surrey had a manual tester for them and I was amazed at how simple the job actually was, we were also able to put through a lot more diesel than would normally be given by an injector pump which helped clear out the nozzles from build up. Ed
82 Hotspur Sandringham 6x6
95 Defender 110 300Tdi
Post #808714 4th Jan 2020 4:16pm
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jfh



Member Since: 08 Jan 2014
Location: West Coast
Posts: 359
South Africa 2007 Defender 110 300 Tdi SW Chawton White
It's the primary and secondary pressure that is worrying me, not sure how to do this.

My tester can go to 600 bar but it's fully manual, like one lever.
Post #808728 4th Jan 2020 5:19pm
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Oldowner



Member Since: 26 Dec 2018
Location: South west
Posts: 625
United Kingdom 2007 Defender 90 Puma 2.4 HT Aintree Green
I have a Hartridge Testmaster 2 computerised tester, which was over £5000 new, and even that cannot test 300tdi injectors fully without a secondary pressure add on at another couple of thousand pounds.

With a standard tester like the hartridge you can still test the primary pressure, spray pattern and leak back time, so it gives you a pretty good idea of injector performance. I have found that stripping the injectors down and cleaning them / ultrasonically cleaning the nozzles and reassembling can cure a poorly performing 300tdi injector.

300tdi injectors have five ports, and not quite evenly spaced around the nozzle,
Post #809408 8th Jan 2020 7:52pm
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jfh



Member Since: 08 Jan 2014
Location: West Coast
Posts: 359
South Africa 2007 Defender 110 300 Tdi SW Chawton White
Thanks for your reply. Not the answer I wanted to hear but the answer I was expecting.

I didn't think it was going to be that easy to test them.
Post #809482 9th Jan 2020 5:54am
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Rovadon



Member Since: 20 Apr 2015
Location: Vancouver
Posts: 5
Canada 1993 Defender 110 300 Tdi SW Alpine White
I was gonna try this…

https://mercedessource.com/store/diesel-fu...t-yourself
Post #975159 19th Dec 2022 5:25pm
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