Same injectors on XUD9 and XUD9TF?

Wookey · Post by **Wookey** » 15 Feb 2005, 15:22

I know the injectors have to match the pump type (bosch/lucas), but do they also change between NA and TD engines/pumps? I have a set of injectors from my old NA engine and it would be convenient to get them serviced and put in the new engine at my leisure, but I'm not sure if they are the same? Or I could take the new ones out and get them done, then I'm sure everything matches up.
Obviously the pumps are not the same, on these two engines. Do I need to post pump pics in order for people to answer this question?

Wookey · Post by **Wookey** » 15 Feb 2005, 15:24

Actually that title is wrong. The two flavours I have are XUD9A and XUD9TE, in case it matters. I still getting my head round all these designations of slightly different engines.

Post by **Jon** » 15 Feb 2005, 15:46

According to the Bosch catalogue, the n/a injectors have completely different part numbers to the TD ones.

Kowalski · Post by **Kowalski** » 15 Feb 2005, 17:27

The NA injectors are definately different.
Different opening pressures, different nozzle spray pattern etc.
You could probably swap them over but best case your engine would run like a bag of spanners, the timing would be out, it might not run at all or it could do damage to itself.

Wookey · Post by **Wookey** » 15 Feb 2005, 22:28

OK- thanx for that guys. Saved me wasting 80 quid. I'll get the others out and service them then.
The different injection pressure probably doesn't matter - just tell the servicing guys which engine they are destined for and they can change the shims (assuming it is still with the acceptable range for the injector), but a different nozzle obviously is an issue. I'm surprised the nozzle pattern changes - I don't think the swirl chamber design is any different on the TD?
Where do I get a catalogue/cross reference of the bosch injection products - that would be useful?

bikeboyz · Post by **bikeboyz** » 15 Feb 2005, 22:52

Most service centres like Lucas will do them next day anyway so maybe not worth the hastle.

Wookey · Post by **Wookey** » 16 Feb 2005, 20:44

Hmm, I've taken out the injectors now and had a look at the numbers. Both the NA and the TD injectors say KCA17S42 on the side but the NA ones say 130bar, the TD ones 175 bar. So I think that means same nozzle pattern, but different pressures - right? Interestingly these injectors came out really easily, whilst the NA ones were epic to get out, especially the one on the swirl chamber that cracked - overheating, perhaps?
There don't seem to be any fire washers in the bottom of the holes - is it just that they are difficult to get out? (the engine is back in now and visibility isn't very good). And should I be able/try to remove the 'seat' in the bottom of the holeon which both the washers sit?

Kowalski · Post by **Kowalski** » 16 Feb 2005, 21:16

I would have thought that the main body of the injector would be the same but just the shims, springs, needles and nozzles etc would be different.
The nozzles need to be different because the TD injectors need to inject more fuel than NA ones do.

Wookey · Post by **Wookey** » 17 Feb 2005, 03:18

yes - it turns out that number just refers to the body, so looks like you are right. Our local injection service place (a marvellous throwback to the 1950s) found that one of my injectors was very poorly, so I've had that exchanged. The others were OK, although one had the end 'blued' - so it had obviously got very hot at some point - and clues why that might be?
Hopefully the poorly injector explains the nasty clattery noise on my 'new' engine. I'll test it tomorrow.