Metris or Express cargo?

[nigel dabster]

22 hours ago, trapezeartist said:

Nothing to do with fwd. Mercedes just seem to have a liking for big castor angles. True of C Class, E Class, maybe others.

Might well be so. Vito is good on tyres, compared to most fwd vans in Europe

[jimmyl]

On 11/24/2018 at 3:40 PM, section swept said:

Lion cage with nothing round your neck is far more entertaining, if you’re lucky you’ll get a nice wet slurpy lick before being chewed to bits.?

Diesel engined vans like the Vito have had injector issues, the injector seat sealing washer burns through ( minutely) and allows burning gases to blow up the side of the injector which causes carbon build up and seizes the injector into the cylinder head injector space. Not helped by the fact that on some the rain water gets into the injector head space and rusts the injector body to the head. There are guys in the UK with all the specialist equipment just doing this repair alone. You can tell when a seals blown by the clicking noise that it makes. Be aware of this issue before buying, the seals cost peanuts but the tooling required to re seat the injector and/or replace the injector with new can be very expensive.

the Mercedes injector issue is a simple cheap fix if you catch it quick enough.

Lots of penetrating oil (various brands available) will see injector come out with a bit of wiggling. Unless badly burnt I use a piece of 15mm copper pipe with a stop end on  one end an a 90 elbow on the other. Wrap some insulation tape around about an inch up to make a snug fit in the bore then some fine wet and dry double sided to the end , Use a bit like seating a valve, once happy with a good witness mark on the wet and dry give a really clean out then make sure the retaining bolt holes are immaculate and free running - cut a slot in the old bolt to clean out the thread then some 4mm air pipe on a blow gun to get right to the bottom of the hole,

Genuine Mercedes sealing washers and bolts and torque exactly as specified -be very careful  - easier to do the job twice than snap the bolt in the head 

Done a few on the van and also on the better halves  c class - about 1/2 hour per injector now I got my set up

 

 

[nigel dabster]

usually on high milers, think honda injectors fit some models, but as jimmy says change before its a problem.

[section swept]

On 11/30/2018 at 4:15 PM, jimmyl said:

the Mercedes injector issue is a simple cheap fix if you catch it quick enough.

Lots of penetrating oil (various brands available) will see injector come out with a bit of wiggling. Unless badly burnt I use a piece of 15mm copper pipe with a stop end on  one end an a 90 elbow on the other. Wrap some insulation tape around about an inch up to make a snug fit in the bore then some fine wet and dry double sided to the end , Use a bit like seating a valve, once happy with a good witness mark on the wet and dry give a really clean out then make sure the retaining bolt holes are immaculate and free running - cut a slot in the old bolt to clean out the thread then some 4mm air pipe on a blow gun to get right to the bottom of the hole,

Genuine Mercedes sealing washers and bolts and torque exactly as specified -be very careful  - easier to do the job twice than snap the bolt in the head 

Done a few on the van and also on the better halves  c class - about 1/2 hour per injector now I got my set up

 

 

You have been singularly lucky, people have wrecked the camcovers using your and other methods of wriggling and levering. Coca Cola works quite well at eating the carbonised crude that works its way up from the combustion chamber/injector passageway. The electronic injectors don’t take kindly to any sort of brutalisation. Yep, once you’ve got the engine cover off, the job if straightforward is about 20 mins per injector. The MB UU owners club forum is littered with injector removal issues. Once repaired it’s a good idea to dose the outside of the injector with a suitable lubricant, also good idea to check for signs of the dreaded carbonisation, that stuff can ruin the wiring harness for the injectors. 

How did prevent abrasive material getting into the cylinder head injector hole. At Mercedes we remove the glow plug, that’s tricky as well as they tend to snap off as they have very long bodies, into the glow plug hole goes a compressed air line adaptor blowing air into, up and out of the injector hole. This way when we recut the seat any debri is ejected. The whole area is thoroughy vacuumed to remove any other small pieces of scarf. The injector face has to be resurfaced otherwise the seal will fail again, the escaping combustion burns a tiny trail approx 0.005mm through both the seal and the injector sealing face...very often the injector cannot be saved the overall length of the injector allied to the depth of the injector passageway equates to the clamping force between injector and seal. After cleaning up the seat face and the injector sealing face the clamping force are reduced. The whole design thing is over complicated, but the same faults occur on Ford, Honda and most of the Vauxhall and French stuff....nightmare when you consider Toyota use a belt and braces approach to there direct injection injector clamping method. Apparently Honda CRV injector seals will fit down the MB injector  passageway(hole) ? Once the injectors are ready to be refitted we smear a special grease onto the injector outer sleeve to try and prevent seizure. An owner going apoplectic after being told he needs 5 new injectors at £200+ each plus labour at £135 +vat is not a pretty site I can tell you. Take too much out of that injector hole seat face and the cylinder heads scrap. It’s enough to make you buy a petrol powered vehicle.

I like your approach but wonder about debris getting into the combustion chamber through the injector nozzle whole. There are those that say it doesn’t matter as it will all go out through the exhaust on initial start up, yep all those tiny pieces of abrasive and swarf getting squashed between valve seat and valve face, ready for burning the valve and seat. 

[jimmyl]

A bit of oil on the wet and dry keeps the muck attached 

i never go past just removing the old carbon and just polishing the seat .

seems to have worked to date and yes very gentle and patient when freeing the injector 

[section swept]

On 12/2/2018 at 2:13 PM, jimmyl said:

A bit of oil on the wet and dry keeps the muck attached 

i never go past just removing the old carbon and just polishing the seat .

seems to have worked to date and yes very gentle and patient when freeing the injector 

?