For JoeBob/IN

Posted by NC wayne on January 22, 2007 at 18:10:07 from (64.12.116.74):

Hey, I just read your response to my post last night concerning the injectors in your Detroit. Before you take them to a shop to be checked you can easily do a field check to check the spray pattern. It's something the guy that owns our local fuel shop showed me years ago and it works. Since a detroit injector is a unit style it does all the work of pumping/pressurizing the fuel as well as injecting it through the nozzle. It does this when the cam causes the rocker arm to push the spring loaded plunger down. That said you can easily duplicate this action with a hard rubber mallet. The easiest way to do it is to first make sure the injector body is full of fuel. If you just took it out of the engine it should be but it doesn't hurt to check. Now hold the injector in one hand, keeping the control rack pushed all the way in to a full fuel position. MAKE SURE THE INJECTOR IS FACING AWAY FROM YOU AND BE DANG SURE NOT TO HAVE ANY FINGER OR OTHER BODY PART IN FRONT OF THE NOZZLE SINCE THE FUEL IS INJECTED WITH ENOUGH FORCE TO INJECT IT THROUGH YOUR SKIN. (I know, common sense but "you never know sometimes"...LOL)Anyway, once things are pointed in a safe direction strike the head of the plunger with the mallet and you should be able to see the spray pattern. If you've ever seen an in ijector tested you'll sorta feel and hear a pop when you strike it which tells you it's building enough pressure to pop the internal check valve to allow it to spray. The spray pattern should look like small V shaped clouds squirting out from the holes in the nozzles. If you see any large drops, it doesn't "pop" when you strike it, or basically if it does anything but produce the V shaped mist then you definately need to take them to a shop. All your doing is basically the same thing the shop will do to check them except your not using a fancy machine and won't actually know what the popping pressure is. Usually though if the popping pressure is low enough to effect the injector/engine it'll show up in the spray pattern. Like I said last night I'm no "expert", all I am is an old school Mechanic that loves to read and learn and work most on anything that comes through the door, so if you have any questions just let me know and if I don't know the answer I probably know someone that does or can look them up.

Replies:

• Re: For JoeBob/IN JoeBob/IN 05:47:30 01/23/07 (0)
• Re: For JoeBob/IN JoeBob/IN 04:48:17 01/23/07 (1)
  • Re: For JoeBob/IN NC wayne 18:17:19 01/23/07 (0)

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