Injectors don't have a serial number, it's just a model number / type.
as I got one spare, i installed it.
All 5 injectors were the same. I read somewhere that spring loosens with age, which means thin washers could be installed as fuel high pressure pump gives higher pressure, if you have the equipment to test.
also parts can be replaced, like needle and ball bearing, springs, etc. See diagram below.
Not hard at all.
roll of kitchen towels, wd40, little screw driver to scrape out soot, long screw driver to clean out socket in the cylinder head ( also used milk bottle plastic cap, cut out hole in it, cut short length of garden hose to fit, taped it firm, attached to the hoover, sucked it all out ), material sponge for scrubbing frying pans ( fix nozzle in the drill and rotate pressing on the sponge, cleans well, if your needle bites the nozzle, then press that sponge inside the nozzle with a tiny screw driver and rotate, same with the needle ).
Do not take middle apart, not needed. Just check ( holding vertically ) when top and bottom of the injector are off press valve ( little pin ) upright at the bottom of the injector, it should fall down with gravity.
After playing with cleaning put nozzle into a hand car/bike pump ( the one you can squeeze/fix for shedder / pesta nozzle ) and blow the needle inwards ( fixes properly in the pump ).
Then use wd40 inside the nozzle and see if all 6 holes are clear, you'll see nice spray.
Also spat inside the fuel line inlet and press valve upright.
If one of the holes is blocked, find little electrical wire, split it and use one of the veins to clean the hole and then use pump inwards and wd40 outwards for checking, also hold nozzle upside down and spray inside, let all debris leak out, clean inside by twisting kitchen towel. Make sure you use one that doesn't fall apart easily and isn't a material one. PAPER !
Edges are sharp and sometimes kitchen towel rips inside, pull out with a little screw driver, keep an eye.
IF YOUR EYESIGHT IS BAD DO NOT OPEN !!!
There will be few little parts,: 1 spacer, 2 washers, 2 bigger washers ( one top, one side ), 2 sprigs, ball bearing seat with little ball, 2 guide pins and few others, all magnetic except THE BALL. Tiny stainless ball, jumps everywhere.
I'd suggest using A3 white sheet of paper with folded edges.
Then spray and clean several times.
Main thing is : Lubricate nozzle with wd40 or similar and hold nozzle upside down, install needle and make sure it falls out freely and you push it back in again, several times, make sure nothing is biting. If it does, then use sponge, drill and screw driver to clean inside the nozzle and outside needle, NOT METAL SPONGE, just a rough material kitchen sponge for frying pans and dishes.
You will also need to replace copper rings at the bottom of the injector.
http://dieselcatalog.online/en/bosch/04 ... 10218.htmlI didn't have part N48 and above that N805, instead I had a longer spring, same was in all injectors.
Also one rubber got blown off one of the injectors, it is for cooling nozzle. Make sure you have one spare. I'll run without it, but avoid.
Cylinder N4 is at the back, is the hardest as you can't see inside the socket. Take a picture with your phone and make sure it's clean.
N3 is easier, but plastic valve needs to be taken off for easier access ( easy ).
Tools needed to take out injector:
Spray WD40 leave over night.
8 socket with extensions.
10 socket with extensions.
13 spanner in case you fuel line adapter nut will be spinning
17 spanner for fuel line
adjustable spanner to take off bolt for engine noise cover ( 15 or 16 )
long screw driver, couple of clothes to clean socket, thin long players to pull out pins from the return line of the top injector and pull out injector holder.
To disassemble injector:
Bench vice, to hold injector in.
adjustable spanner ( I think it's 30 )
13 spanner
15 spanner
In case you will decide to disassemble the middle it’s the large Allen key.
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