Cdi injector seals, (again)

Steve Taxi

Senior Member
Joined
Jan 29, 2005
Messages
248
Reaction score
8
Location
Malvern, Worcs.
Your Mercedes
W222
Sorry to bring this old chestnut up again but I think this may be of interest, just found two injectors blowing again after doing the seals a couple of months ago, on removal I took note that they were blowing between the seal and the nozzle cap, looking closely at the nozzle caps they are eroded at the blow by site maybe only a thou or two so not a flat mating surface.
So I went to have a word with my local diesel specialist and he said that there is no seal between the cap and the copper washer required which I find hard to accept, he went on to tell me that the seal is achieved as the washer squashes against the nozzle in the centre hole and then told me he needs to replace nozzles and caps as it is the nozzle that has degraded, £220 for two injectors, I cannot see his reasoning because the washers have three prongs in the centre and never clamps tightly around the nozzle.
Dont like to argue with the experts but I think I will just replace the caps, seals and bolts and see how it goes.
 

Number_Cruncher

Senior Member
Joined
Oct 10, 2007
Messages
1,806
Reaction score
2
Your Mercedes
1995 W124 E300D TE
It sounds to me as though with a bit of enginuity, the nozzle caps could be lapped flat again. Perhaps it's worth taking them to an old fashioned engineering jobbing shop and asking them.
 
OP
S

Steve Taxi

Senior Member
Joined
Jan 29, 2005
Messages
248
Reaction score
8
Location
Malvern, Worcs.
Your Mercedes
W222
  • Thread Starter
  • Thread starter
  • #3
I agree that is an option but dont think new ones will be to expensive
 

kebo57

Senior Member
Joined
Oct 4, 2006
Messages
894
Reaction score
3
Location
Lanc's
Your Mercedes
ml270
Sorry to bring this old chestnut up again but I think this may be of interest, just found two injectors blowing again after doing the seals a couple of months ago, on removal I took note that they were blowing between the seal and the nozzle cap, looking closely at the nozzle caps they are eroded at the blow by site maybe only a thou or two so not a flat mating surface.
So I went to have a word with my local diesel specialist and he said that there is no seal between the cap and the copper washer required which I find hard to accept, he went on to tell me that the seal is achieved as the washer squashes against the nozzle in the centre hole and then told me he needs to replace nozzles and caps as it is the nozzle that has degraded, £220 for two injectors, I cannot see his reasoning because the washers have three prongs in the centre and never clamps tightly around the nozzle.
Dont like to argue with the experts but I think I will just replace the caps, seals and bolts and see how it goes.
Hi Steve
I had just the same problem when I did the seals on my ML 270 there was ever so slight errosion, which I rectified by back turning the injector mateing face in my workshop, it would be a minimum clean up that was about 0.002" of metal to be removed its a quick & easy job if you have the right equipement.

But if you cant do this youself then you must relay exactly whats needs to the person that is ging to do this job as its could easily be messed up.

Kevin

PS I could do this for you
 
Last edited:

Cole@MBS

Forum Supporter
Authorised Forum Supporter
Joined
Dec 1, 2008
Messages
13,628
Reaction score
765
Age
51
Location
Hedge End, Southampton
Website
www.mbssouthampton.co.uk
Your Mercedes
124 300 CE 24 Coupe, C220CDI, 1959:Morris Minor
We have a re-cutting tool which cuts the face of the head and the injector flat, only way to do the job correctly!
 

kebo57

Senior Member
Joined
Oct 4, 2006
Messages
894
Reaction score
3
Location
Lanc's
Your Mercedes
ml270
We have a re-cutting tool which cuts the face of the head and the injector flat, only way to do the job correctly!
Not quite correct
what about using the same types of machines that your re-cutting tool would have been made on

Kevin
 

BlackC55

Senior Member
Joined
Feb 23, 2007
Messages
2,488
Reaction score
0
Location
South coast
Your Mercedes
C43
The cutting tool is so easy to use and it take a matter of minuites to use.

You recut the seat on the head with it. So far i have never had one leak again since re-cutting
 

sms78

Senior Member
Joined
Jan 6, 2008
Messages
153
Reaction score
0
Location
Northhamptonshire
Your Mercedes
w210 e320 c.d.i , Vw Beetle 1303
The cutting tool is so easy to use and it take a matter of minuites to use.

You recut the seat on the head with it. So far i have never had one leak again since re-cutting

What injector cutter do you use? cos my seals have been pi$$ing me off for ages . Ive tried the sykes pickavant hand cutter tool and it doesnt seem to like the cdi heads:(
 

exeng

Senior Member
Joined
Sep 6, 2007
Messages
101
Reaction score
0
If the seal was to seal on the internal dia what would stop it leaking around the outside that is why the seats have to be spotless and the cap flat without any burn marks or as everybody says they will leak again
 
OP
S

Steve Taxi

Senior Member
Joined
Jan 29, 2005
Messages
248
Reaction score
8
Location
Malvern, Worcs.
Your Mercedes
W222
  • Thread Starter
  • Thread starter
  • #10
If the seal was to seal on the internal dia what would stop it leaking around the outside that is why the seats have to be spotless and the cap flat without any burn marks or as everybody says they will leak again

Thankyou Steve so my local 'expert' is talking rubbish.
 

tony2311

Senior Member
Joined
Nov 5, 2006
Messages
70
Reaction score
0
Your Mercedes
W203/2002/270cdi
Anyone near sheffield that can do this as i think one of my injector is leaking
 

tony2311

Senior Member
Joined
Nov 5, 2006
Messages
70
Reaction score
0
Your Mercedes
W203/2002/270cdi
just had a good look and it looks like 2 of the injectors was leaking for a while. anyone within 50miles of sheffield wanting the job of resealing the injectors?
 

kebo57

Senior Member
Joined
Oct 4, 2006
Messages
894
Reaction score
3
Location
Lanc's
Your Mercedes
ml270
just had a good look and it looks like 2 of the injectors was leaking for a while. anyone within 50miles of sheffield wanting the job of resealing the injectors?
Hi Tony
what car have you got

Kevin
 

AIB understand your special Mercedes deserves a special insurance policy. We have a refreshing attitude to insuring high performance, modified, imported or classic and vintage cars and deal with the UK’s leading insurers. We offer discounts for length of ownership, where the vehicle is kept overnight and limiting the mileage and can also cater for those clients who need higher mileage and business use. To obtain a quotation please call the team on 02380 268351 or visit us atAIB Insurance
Top Bottom