Hi all.How do you know if your injectors are shot.Any way to test injectors or pump pressure at home,or cleaning injectors ,thanks

 

You can build a test stand, what you need to be able to do is get the pressure up to around 1800-2000 psi for the injector.

There are three tests that should be performed on each injector to validate it.

Pop Off Pressure - the pressure at which it opens, A real good pressure reading is 1800-1950 psi, any thing below 1425 is trash. Now you can shim the injectors to bring them back up to spec, but I would not even bother and just replace the ones that fail this test.

Leak down - this is performed after the above test, you run it up to just under the pressure found above, and let it sit for a minute or so. If it leaks, it's bad. If not leaking continue on.

Spray pattern. What you are looking at here is for a good clean spray pattern, you don't want dribbles, you want a good overall spray.


If the injector passes all three tests above, it's a good one and does not need to be replaced.

Now most shops will test the injectors for next to nothing, and in some cases they will test them for free. Just depends on your working relationship with the shop owner. In most cases the ones that do charge will credit the testing fee towards replacements if needed. It takes them around 15 mins to fully test 8 injectors. I have had it done many a time while wandering around the display area.

 

Thanks Argve.Now to pump pressure in injectors at 1800 + does that injector have to be anchored down solid when it pop off,will it hit hard,any hazards in doing this .Thanks again

 

I would have it anchored down for safety as well as shield your self from the high pressure fuel coming out, remember it's leaving that injector under lots of force and can in some cases pierce the skin, I love diesel fuel, but I don't want it to become part of me

 

Thanks again

 

Hi,guys.Just finished testing my injectors at home with an hydraulic pump i rigged with a 3000 psi gauge.Most had a real bad spray pattern at first but i took them apart and clean them with oven cleaner (spray) and let them soak for 10 min. ,then retest them all and all had a good spray pattern.They were really gummed up.Now why i have about 1800 psi on left bank and 1600 on right and is it good to use oven cleaner on them???My motor run way better now with lots more power.P.S Thanks again Argve and others for all the good info.