un sticking fuel injectors

[Zed Head]

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]

[Dave WM]

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

[Dave WM]

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, 2019 by Dave WM

[240260280]

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. ?

 

[Dave WM]

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.

[Zed Head]

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.

[Dave WM]

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.

[Dave WM]

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.

[Captain Obvious]

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?

 

 

[grannyknot]

Ya the plastic pintel covers the tip.

[Zed Head]

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

[Zed Head]

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