How to Identify Fuel Injectors? - Viton vs Metal tipped

[Ado Sigal]

Viton injectors have flat tip, and they are used with a hat, which is 
the spray cone shaper (used on early models). Other two models have cone 
shaper in built, so no need for a hat. If you had hat on them before, 
replace the injector sleeve and junk the hats. Try to use same for the 
set, since they have slightly different spray shape.

Cheers,

Ado



SJ wrote:

>Patient is 1988 5000Q non turbo
>Fuel injection system is the High Pressure type - System Pressure = 93 PSI
>
>How do you identify viton tipped from metal tipped injectors?
>
>I'm replacing my original fuel injectors, which have 165k miles on them and
>18 years.
>Bosch P/N 0 437 502 032
>Audi P/N 035 133 551C
>
>New Injectors are:
>Bosch P/N 0 437 502 043
>ETKA calls for 035 133 551F
>
>The '032' has a deep well at the tip - distance between edge of cap and
>center of tip. . 0.070" deep
>The '043' has a shallow well at the tip .. only 0.020" deep
>
>My parts guy had 3 injectors, and is looking for another 2 at same price of
>first 3 ($27 ea).
>
>Bentley says to use Viton tipped injectors as a set . . .and not to intermix
>viton with metal tipped.
>I want to be sure that the 2 injectors on order are same as first 3.
>
>Question; Is the '043' injector the 'viton tipped' injector?
>
>What the hell is viton anyway? Is this a plastic seat that the metal valve
>rests against?
>
>  
>