O ring and Filter Basket Removal 703 Injectors - JeepForum.com
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post #1 of 3 Old 08-09-2012, 06:09 PM Thread Starter
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1998 ZJ 
Join Date: Aug 2011
Location: The Abyss
Posts: 21,038
O ring and Filter Basket Removal 703 Injectors

I got my rebuild kit today for the Bosch 703 injectors that I pulled from the junk yard about 5-6 months ago and I was excited to get started. The seller gives you one extra of everything incase you are and idiot and screw it up. I had been avoiding this because I though that it would be difficult for some reason. It is not. It took 30 minutes to remove the baskets and O rings from all 8.

You will need:

Flat Head
Vice to hold the screw

The easiest way to remove the basket is with a screw and a vice. I did not have a vice so I used pliers and pulled the basket out. This way is ten times harder because the baskets are in there pretty good. I don't recommend this unless you are strong. You have to pull straight and hard so you don't damage the injector. It was quite a workout getting all 8 of these out in one sitting. Do not pry it back and forth. If you have a vice you can be done in ten minutes. Get a vice.

To remove the hat that's on pressed on the injectors spray side, use a flat head driver and carefully pry up on all sides against the rubber O ring and not the injector. It will most likely go flying off in some direction. The O rings came off with little struggle just using my fingers. If you use the flat head be careful not to damage the injector.

With a philips driver, screw the screw into the end of the injector with the filter basket. DO NOT mess with the spray end. Put the end of the screw into a vice and pull. The basket will come right out on the screw.

You can see how worn out the old parts are. The baskets deteriorated when I removed them.
Now they will sit overnight in SeaFoam to get all the nasty out. I may even send them to church on sunday.

I will post the installation of the new baskets and O rings once I go back to the junk yard and get a harness for the injectors so I can use a battery to pulse the injectors for cleaning. Here are the pics from my crappy phone.

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post #2 of 3 Old 08-13-2012, 10:52 PM
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2000 XJ Cherokee 
Join Date: May 2008
Location: Henderson
Posts: 378
Looking good. I just replaced mine with 703's off ebay. Smoothed out the 5.9 nicely.

Looking forward to more posts

1998 Jeep Grand Cherokee 5.9 Limited 4x4 :: 46RE, 249, MSD ignition, PO e-fan conversion to a different e-fan, 3.73 gears
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post #3 of 3 Old 09-16-2012, 12:39 AM Thread Starter
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1998 ZJ 
Join Date: Aug 2011
Location: The Abyss
Posts: 21,038
Well, I rebuilt and installed my 703's from the junkyard. Took about 45 minutes to put the new o rings and baskets on. Remember to lube them up well. I used Vaseline because that's all I had and it dissolves well in gas. Install went fast too. Just pull the TB and remove the fuel rail. I used a small prybar to gently lift one side of the fuel rail up and then the other. Injectors popped out with the rail. You will need a fuel line disco tool from the auto parts store. The old injectors looked like crap but were still operational so I kept them. Just pop the clips off pull the olds out and put the new in. Put the retaining clips back on and re install the fuel rail. I used a rubber mallet and a few rags to very gently tap them into place before I put the bolts back in. They work great! Idle is much smoother and it feels smoother when accelerating. I did not notice a power increase so don't expect that. It's just more refined. Sorry there are no pics but I was in a hurry to track down a bad motor vibe which turned out to be shot motor mounts. I put a pry bar on the mounts and was able to move the motor with one arm without applying a lot of force. I would recommend the 703's if you get them for cheap like I did at the junk yard then get the rebuild kit for 16 bucks off line. Otherwise there are better things to spend your cash on.

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