Re: Fuel Injector tip breaks! And cleaning question...

["RoccoPhil" <roccophil@mindspring.com>]

Well, now *that* is interesting news about the wax fill on new injectors....

The Marren procedure uses a reverse cleaning operation to flush the filter
out.  Maybe they are the right choice after all.  Plus, they spec all the
injectors for flow, so I'll know my best four.

I don't know - I'll have to check through my Bosch book to look for any
cleaning tips and analyze the injector construction.

Thanks for all the info!

-Phil


> Well, guess what?  After years of believing that I could clean injectors
> using the pop bench testor (Bosch I believe) I have now learned by looking
> at
> a cutaway view of an injector that you CANNOT clean them!!!  Sure, you can
> knock the carbon off the ends of them and try to improve the spray
pattern,
> but you cannot clean them.  Anyone know why?  They have a filter inside
the
> injector.  Since they have two pressure valves in them, you would have to
> open the valves by applying pressure in the regular direction then at the
> same time push fluid through the other direction to clean the filter.
> Impossible!  So, you can test the ones you have for flow, leakage, spray
> pattern, and pop-off pressure (3.5-4.1 Bar).  If they pass these tests
than
> they should be OK.  If the cap comes off, the injector is junk unless it
> passes the above tests and is used in a non-air shrouded system since the
> caps are pressed on and once they fall off they may do it again either
> interferring with the spray pattern or dropping into a valve or cylinder.
I
> would go with new ones unless you are on a tight budget, then find someone
> to
> check them.  25 bucks each sounds steep!  Remember, also, that new
injectors
> need to be popped on the testor also since they are packed with wax from
> Bosch and I have seen injectors not pop with the wax in it until 7+ bar
> (kinda hard to get the injector to pop at 7 bar in the fuel system when
the
> pressure sent to the injector is 4.4 bar!).  HTH!!!
>
> Dave
>
>
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