Pintle caps and O-rings

[Christopher Bruno]

Hey gang,
	I have finished cleaning (well almost finished) the entire
manifold and plenum of the GM TPI that I'm swapping into my S-10.
So, I decided I would clean up the outside of the injectors (there
was some surface rust on a few of them.  Upon close inspection of them
I noticed that the pintle cap was cracked on one of them.  So, this
pintle cap was easily removed and then I decided to try to remove the
pintle caps on the others to make it easy to replace the lower o-ring.
Well, I broke two more pintle caps before deciding that I shouldn't
try this without some advice.  So I have a couple of questions:
	-Does anybody know how to remove the pintle caps without
		breaking them?
	-Does anybody know a good supply (read CHEAP) for pintle
		caps and O-rings for Bosch injectors?

	Also, I wirebrushed the steel housing of the injectors to get
the rust off using my bench grinder and the paint came off also (must
have been a thin coat of paint).  Anyways, the injectors look very
cool when polished to a nice shine!

	Finally, there was a bit of discussion about injector cleaning
a while back and backflushing, etc.  And I would like to try to
construct an assembly that would flush cleaning fluid through the
injector in either direction (maybe by flipping a lever or switch
or something).  If I develop this assembly and create drawings for
it would anybody else be interested in trying it out?  Bruce, the
circuit that you sketched a while back flipped the injector at a
set frequency (if I'm not mistaken - just keep in mind that I'm an ME).
Would it be possible to change one of the resistors in your circuit
to a rheostat that would allow the duty cycle of the injector to
change?  This way you could run the injector at a lower frequency to wet
and soak the injector, and then crank the frequency up a bit for the
anticipated 'hammer' effect to clean the pintle (or whatever kind of
injector there is).  
	I was also thinking that a could design the fluid passages such
that there would be a flutter in the fluid at the injector at certian
flow rates.  This flutter would act as an agitator to aid in the
cleaning.
	To use this cleaner all that would be necessary would be
compressed air and a 12volt power supply (this eliminates an expensive
pump, though a pump could be used also).
	Any comments or suggestions?


-- 
Christopher Bruno
Teradyne
321 Harrison Ave. MS/H63
Boston, MA 02118
617.422.2040 Office
617.422.2304 Fax
bruno at icd.teradyne.com