how to get the O-rings on the injectors?

[shogun]

I mean the easiest way.
Have many parts of my V12 out. Just received a lot of parts from Autohaus Arizona. Among them the O-rings for the fuel injectors.Well, I thought it is an easy job, o.k., 12 injectors take more time, but...
The things are so tight, difficult to get them off (because hard by age) so I tend to cut them off.
But how to get them on easiest? Heating them up in hot /warm water? A bit of oil? Dish detergent? Bought some as extra if I break some, so have 6 spare ones, in total 30.
Man 12 valves = 24 O-rings. Or are the upper ones on the rail usually not to be replaced? I know it is a heavy job to get to the injectors again, once I have installed the inlets again. But first of all I exchange all the fuel and vaccum hoses. Some of them are like glass and break when I touch them. Car is only 15 years old. So beware, check the fuel hoses regularly, and mainly the ones you do not see when all is installed, like under the throttle valves etc.
So, back to the O-rings. What's easiest?


Man, I can disassemble almost the whole car. But these tiny delicate things make me.....
Anyway, they have to be replaced
the tips are similar to these, actually they are Bosch

[Derek A.]

I usually use a small amount of synthetic asssembly grease:

http://www.redlineoil.com/products_c...p?productID=68

[Bill R.]

vaseline, for injector orings.

I mean the easiest way.
Have many parts of my V12 out. Just received a lot of parts from Autohaus Arizona. Among them the O-rings for the fuel injectors.Well, I thought it is an easy job, o.k., 12 injectors take more time, but...
The things are so tight, difficult to get them off (because hard by age) so I tend to cut them off.
But how to get them on easiest? Heating them up in hot /warm water? A bit of oil? Dish detergent? Bought some as extra if I break some, so have 6 spare ones, in total 30.
Man 12 valves = 24 O-rings. Or are the upper ones on the rail usually not to be replaced? I know it is a heavy job to get to the injectors again, once I have installed the inlets again. But first of all I exchange all the fuel and vaccum hoses. Some of them are like glass and break when I touch them. Car is only 15 years old. So beware, check the fuel hoses regularly, and mainly the ones you do not see when all is installed, like under the throttle valves etc.
So, back to the O-rings. What's easiest?


Man, I can disassemble almost the whole car. But these tiny delicate things make me.....
Anyway, they have to be replaced
the tips are similar to these, actually they are Bosch

[shogun]

I just found this here:
quote:

Finally, to get the new o-ring on, you will need to remove the tip. The best method I figured out for removing the tip was to get a small 8-9mm crescent wrench and apply uniform pressure against the tip (Figure 18). However, this still results in some of the plastic on the tip becoming marred. Pressing up with the wrench using a surprisingly large amount of force will make the tip pop off of the injector. At this point, you can attach the new o-ring and snap the tip back on.
------------------------------------------
Is that really necessary to remove the tips? That looks a bit dangerous to me.
They are not available as separate item.
I think I can slip the new o-rings over the tips, that might be the safer method.
Anyone experience with that?
http://www.pelicanparts.com/BMW/tech...eplacement.htm

[Booster]

I use long thin tipped "needle nose" pliers at work to handle smaller O'rings. Simply place the O'ring over the closed end of the pliers and spread them open enough to encourage them to slip over....with some Vaseline too.
Might help evade the damaged tip too ??
.............Vinny

[632 Regal]

I dipped mine in gearlube and rolled them on...was a no brainer, maybe I did it wrong?

I just found this here:
quote:

Finally, to get the new o-ring on, you will need to remove the tip. The best method I figured out for removing the tip was to get a small 8-9mm crescent wrench and apply uniform pressure against the tip (Figure 18). However, this still results in some of the plastic on the tip becoming marred. Pressing up with the wrench using a surprisingly large amount of force will make the tip pop off of the injector. At this point, you can attach the new o-ring and snap the tip back on.
------------------------------------------
Is that really necessary to remove the tips? That looks a bit dangerous to me.
They are not available as separate item.
I think I can slip the new o-rings over the tips, that might be the safer method.
Anyone experience with that?
http://www.pelicanparts.com/BMW/tech...eplacement.htm

[shogun]

I used these tools
sharp cutter
http://www.pelicanparts.com/BMW/tech...ement/pic8.jpg
and these small tools with hooks for soldering and other stuff, when I cut with cutter, I have this tool underneath to avoid cutting into the nozzle by accident.
http://www.7-forum.com/forum/attachm...achmentid=7188
The tips I will not remove like this
http://www.pelicanparts.com/BMW/tech...ment/pic11.jpg
The tips are very important for the spray pattern. Do not want to damage them. Not available as single item.
http://www.pelicanparts.com/BMW/tech...ement/pic3.jpg
Hope they will not break when I slip the rings over. At least I will try one when I come home.

[genphreak]

The tips are very important for the spray pattern. Do not want to damage them. Not available as single item.

Erich, the tips you speak of are actually called pintle caps. You can buy them and o-rings on ebay in packs. If I'd seen this post earlier I would have let you know...

I doubt that all Bosch style pintle caps are the same, but I've never seen any different ones and they are important for the correct spray pattern- which is why I expect there would be other types in existence as the injector bodies are common, just the flowrates (and spray patterns?) vary from one application to another.

The pintle cap and o-ring kits are not expensive at all- like US$6 or US$20 plus freight no more... you might well have to look on the US eBay of course and convince the seller you are not a terrorist seeking o-rings...

I wish someone would sell an o-ring kit for the car! My tranny dipstick is missing one, and I'd like to replace the oil dipstick one, plus they are always the items of which one never has the correct size or type when doing those 'odd jobs'... Nick

[jmw.bmw]

Hi
BMW technicians use a special spray fluid for all such jobs. You can buy it from a main dealer. I use it all the time and it is fantastic for use with any tight fitting rubber parts. It was most useful when I replaced the rear rubber mounts on my E34 and of course the injector 'o' rings. It is available in a 300ml spray can, known as 'Kontakt-spray' and I think the part number is 81 229 400 208. Good luck.

[shogun]

Man, that I did not know that they are available as separate items. The paper I read said "not available". So that made me worry. Thanks, here are some
http://cgi.ebay.com/ebaymotors/Fuel-...spagenameZWDVW
http://cgi.ebay.com/ebaymotors/Fuel-...spagenameZWDVW

And they even sell the o-rings in packs of 1000 pcs. Whow, I can damage a lot now.
http://cgi.ebay.com/ebaymotors/ws/eB..._BIN_Stores_IT
spacers
http://cgi.ebay.com/ebaymotors/ws/eB..._BIN_Stores_IT
Service kit
http://cgi.ebay.com/ebaymotors/ws/eB..._BIN_Stores_IT

@jmw.bmw
'Kontakt-spray' I will buy, thanks