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  #1  
Old 04-07-2010, 08:12 PM
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Lightbulb Another Home Made Injector Pop Tester

Almost exactly like Sunwizard's, but mine uses all new parts.

New Torin Big Red 10-ton capacity hydraulic jack: $40 from Northern Tool plus $12 shipping
New 3000 psi glycerin filled gauge: $12 from northern tool
Assorted fittings from McMaster (1/4" NPT female by female by male tee, 1/4"-1/8" adapter, and 1/8" male to compression fitting for 6mm tube): $12
Injector hard line from junkyard

Endless pop-testing: priceless

I haven't got a way to continuously feed in fuel, but it holds a fair bit, so I'm just going to keep refilling for now. The gauge is also a bit awkwardly placed, I'm going to see what I can do about that. Looks and works great, though. Just need to find the specs for the injectors

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  #2  
Old 04-07-2010, 09:05 PM
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Looks nice.
You might consider simply mounting the Gauge Higher so that it clears the pump area.

If you make the rear legs an inch or so higher the Fuel will run down hill.

A lab supply shop will have plastic squeeze bottles that have a pointed end. You can put the Fuel into the bottle and squeeze it into the Tester.

A Lab Supply shop will know if the plastic can take the Diesel Fuel.
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  #3  
Old 04-07-2010, 09:25 PM
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Quote:
Originally Posted by Diesel911 View Post
Looks nice.
You might consider simply mounting the Gauge Higher so that it clears the pump area.

If you make the rear legs an inch or so higher the Fuel will run down hill.

A lab supply shop will have plastic squeeze bottles that have a pointed end. You can put the Fuel into the bottle and squeeze it into the Tester.

A Lab Supply shop will know if the plastic can take the Diesel Fuel.
I used an old glass pyrex buret with bio-diesel and it seemed to work out pretty well. I have some old injectors that I think I might try some different fuels in to see if there is a visible difference in the spray pattern.
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Old 04-08-2010, 12:48 AM
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Quote:
Originally Posted by JEBalles View Post
I used an old glass pyrex buret with bio-diesel and it seemed to work out pretty well. I have some old injectors that I think I might try some different fuels in to see if there is a visible difference in the spray pattern.
Off subject.
But, as an example heated WVO Injected is going to spray differently than room temp WVO.
So I am not sure how valid such a test would be. If you want to duplicate the conditions of the alternate Fuel as it enters the Fuel Injection Pump; with some I think you would need to heat it.

In fact in operation the Fuel Injection Pump and the Hard Line get a little hot in operation.

Also when the Injector injects the Fuel into the Engine against the denser compressed Air in the Cylinder I believe the spray pattern must be different than the one we see when we Pop Test.
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Old 04-09-2010, 08:30 AM
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Diesel911: you took the words right out of my mouth. Even went a bit further. I was just going to say, use the same fuel for the test that you use in the vehicle.

UDAMAN.

JEBalles: Thanks for sharing. Nice little pop tester there. I will be doing my injectors this spring or summer and I think I'll give your design a try. Been thinking of visiting Northern and checking it out anyway. I get giddy going into a hardware store.
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Old 04-09-2010, 01:43 PM
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It would be more out of curiosity than anything else, not for any kind of definitive data.

I also turned the tee back a few degrees so the gauge could clear the pump so I can see it while I'm pumping. Also off topic, but are good and bad spray patterns easily discernible? Stream vs. mist, right? Also, when you get it just at the pop pressure, even the ones that shoot a mist with vigorous pumping shoot a stream if you pump it slowly. Normal?

Another thing with the pump, maybe just because I didn't fill it up enough, but it was kind of weird pumping. Like, I'd bring the handle up all the way, but I'd only encounter resistance near the bottom.
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  #7  
Old 04-09-2010, 03:55 PM
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If you pump a large quanity of Fuel through the Nozzles the spray pattern is going to hose.
What you would like to happen is when you slowly apply pressure as you pump the Handle during 1 stroke is for the pressure to rise up to the Pop Pressure and the Nozzle open suddenly with a buzzing-chattering type sound, produce a good spray pattern and suddenly close after the pressure drops.

Next (I forget what the actual spec is in the FSM) you want to slowly pump the Handle durning 1 stroke and bring the pressue up until it is about 200psi below the Pop Pressure and see if the Nozzle leaks or drips. This tests how well the Pintel is seating in the Nozzle. There is also a spec in the FSM as to how much leakage is allowed.

One of the Problems with New Nozzles is (from my experience with Bosch Nozzles back in the 1970s, none were made in Asia at that time) is than in a set of Nozzles you will have some that will be excellent and some marginal. Sometims some were bad enough to be sent back and exchanged for other new ones.

Out of 4 sets of New Monark Nozzles I have had one that had a slightly feathered spray and one that sprays sort of a figure 8 spray pattern (I have never gone back yet and checked to see why, sometimes it is just dirt or something got into th seating area). The rest of the Monark Nozzles were all in the Excellent catagory.

Used Nozzles have even more variance in spray pattern and leaking. You just need to make a judgement call on them.

I was fortunate that when I was learning Nozzle Testing if I had a question or was undecided I could ask my Boss. It is hard to relate 5 years of experience in words.

Hunter's thread a while back was asking the best Cammera to take pics of Injector Spray Patterns so perhaps in the future there will be some referance to look at.
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  #8  
Old 04-05-2018, 04:50 AM
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TTT .
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  #9  
Old 04-05-2018, 10:49 AM
Shadetree
 
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Off road diesel is red and it's a bit cheaper since there's no road tax involved.

This is a snip from the FSM for the 617 diesel so the popping pressure is too much for the 240 engine but I believe the method of testing is the same.

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Another Home Made Injector Pop Tester-testing-instruction.jpg  

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