300tdi injectors

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kes86

kes86

Active Member
Posts
775
Location
Isle of Man
Decided to check my injectors due to intermittent knock. Wish I hadn't now, 1 and two came out fine and had no soot and the pin holes looked fine, I borrowed an injector pressure tester but the thread was wrong, so cleaned them up and put them back in.

No 3 came out fine, but the tip is really pitted, I can make out the injector holes just but a couple look damaged or blocked.

Can't get 4 out. I have got it to turn on the scanners but it's not loosening up. Going to try and borrow a slide hammer tomorrow.

Any idea what may cause the tip of 3 to pit, a pal told me no 3 injector is usually the dodgy one, guess he might have been right.

Tried penetrating fluid and 3 in 1 but given up on 4 for tonight.
 
afaik you can replace just the nozzles, which is what accounts for the spray pattern.
or you can get them reconditioned, ie cleaned, checked and new nozzles.
 
Yay the slide hammer did the job. The stuck one looks fine nozzle wise, but the body is a bit chewed from the spanner effort from last night. So only one really bad one. No longer panicking about the job, just got to weigh up the options, I can't find anyone local to test them, so it's either new or send off for refurb. If I could borrow a tester that fits I'm sure I could sort them myself. Anyone recommend a refurb place?
 
Update. Fitted a set of secondhand injectors in really good nick. It's up and running and seems smoother, more like a 4 cylinder than a 31/2 it was.
ImageUploadedByTapatalk1411302299.693632.jpg

Still not sure why no 3 is so pitted, it came out easily but the diesel pipe fitting on the top was quite loose not really nipped up.

No 4 on the right was a mare to get out but came with the slide hammer. The injector hole needed a good clean out before the new injector would drop in.

New seals and torqued up to 25nm.
 
Managed to test the old injectors in the photo last night after getting a pipe with the correct thread. The pitted one from cyl 3 wasn't too bad a spray pattern but wasn't pulsing, the pop pressure was about 250 psi. Two of the other injectors were ok spray and did pulse correctly, and pop pressure ok. The last injector which was from cyl 1 or 2 was ok, except the spray pattern was poor, and not atomising well.

The new injectors didn't get tested before I fitted them, but the running and power is definitely better. I might test them if I need to take them out again for any reason.
 
Running much better, starting to get my faith back in the motor, it's smoother and sounds like it's running on 4 now, old injectors tested and not terrible, but a couple had poor spray patterns
 
Out of interest, how did you connect the slide hammer to the injector. I have a slide hammer but can't really see how I would connect the two without damaging the injector.
 
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