Mass + inertia. Bang the top on the top of your work bench.  Then shake it like a tiny shake weight.

Here's a note from a guy who did a bunch of work on some Z stuff.  He posted a lot back when the internet was just words on a blue screen.

https://yarchive.net/car/injectors.html

 

I have problems with the concept right off the bat because I've seen
bosch injectors rust literally before my eyes after getting a bit of
water in them.  I have one here in which, being lazy, I dipped the tip in an
aqueous solution in the ultrasonic cleaner.  The pintle rusted and stuck
literally before I could dry it.  JGD]

giving it a try now (bang top on bench) will report back

success. Tried the banging, no joy, used a bolt extractor, the drill bit that came with it was a perfect fit, so I tried the bolt extractor, got it to bite used some vice grips to hold it and then bang on them (think slide hammer) still nothing. then I just took the same drill bit and tapped it into the center body (went pretty deep) seemed to catch on something, used the vice grips and in a process of banging, twisting I heard it free up. hook back to the tester and buzz away. put it back on the juice (see the video) pulled a vacuum and it would suck up the PB blaster. I could control the flow by turning it on and off. going t let it soak in the PB blaster for a while with it running.

Will try the remaining 2 that are stuck and eventually use cleaner and spray to check spray pattern.

Edited February 6, 20196 yr by Dave WM

2 hours ago, Dave WM said:

is that a threaded hole in this pic? I removed the filter and can see what looks like a hole, maybe that one, and if threaded, perhaps a screw can be inserted to use as a tool to pull back on the plunger.

 

It is the spring. ?

 

I must have grabbed the wrong pic. it would be the hole observed from the unassembled injector that you would see if you removed the filter and look down the inlet.

1 hour ago, Dave WM said:

Will try the remaining 2 that are stuck and eventually use cleaner and spray to check spray pattern.

The early factory injectors just squirt a stream.  Pretty crude, disappointing.  Volume and balance are the key, I think.

thanks ZH that is what I was thinking. I do a flow test to see volume more than anything. Measure out the amount of fluid over a period of time.

trying something new, I have a working injector zip tie the body to a non working. Hoping the vibes from the working one will help jar loose the non working one.

The tip of the plunger doesn't really stick out of the end during normal operation? Like this? There's normally something else covering the outlet end of the injector, isn't there?

 

 

Ya the plastic pintel covers the tip.

I think that the tip of the plunger is called the pintle and it's often protected by a pintle cap.  You can buy the pintle caps separately.

I think that this link below, Z1Motorsports, might be a "Rick-roll" link.  The header shows "never gonna give you up" but I have sound muted.  Beware.

Not sure why they call it a pintle.  There's supposed to be a gudgeon involved. https://en.wikipedia.org/wiki/Pintle

https://www.z1motorsports.com/fuel-rail-and-injectors/z1-motorsports/fuel-injector-cap-early-style-p-3225.html

Here's a much cheaper one - https://injector-rehab.com/shop/Bosch-Denso-Pintle-Cap.html