Diesel Injector "O" rings

With the temps getting down to my sons IQ level, maybe even lower, I have been getting strong diesel smell in the cab. Popped the hood and see fuel around my injectors. After the truck has been running for awhile they seem to quit. I'm just not thrilled about diesel fuel leaking down on the hot exhaust.<br /><br />It is a 94 pre powerstroke engine. No turbo (yet) and is IDI. It looks pretty simple. <br /><br />I presume you pull the fuel line off the injector. Then the return fuel cap comes off exposing the "O" rings. Is it just this simple or does it sound easier than it really is?<br /><br />One friend told me to do only one at a time and start it afterwards. This helps purge any air in the line and makes it easier to prime the fuel rail.<br /><br />Has anyone else had to do this? Thanks

Re: Diesel Injector "O" rings

Re: Diesel Injector "O" rings

Done it, it is easy. Only real problem is if you lose prime in the system. Before starting after the fix turn the ket to the run position, wait 3 to 5 seconds, turn key off, turn key on 3 to 5 seconds, off again. This will pump plenty of fuel to the system and help in starting. <br />This is a common problem with deisel engines. The fuel breaks down the ring over time. <br />BTW the fuel leaking down onto the exhaust most likely won't ever catch fire. The only real problem it will cause is it stinks and it gets everything dirty.

Re: Diesel Injector "O" rings

Thanks Bomar and DD, Changed the "O" rings without any problems. Took 20 minuets on one side, and then the other side took about an hour because of the fuel filter bracket. I had to pay for my "O" rings, just set me back a whole $2.56 with the tax!<br /><br />Thanks again guys for re-enforcing my can do confidence!

Re: Diesel Injector "O" rings

Re: Diesel Injector "O" rings

Bomar, I did one side first, started it up. It ran rough for about a minuet then started running like it was surpose to. Then I repeated the other side the same way. Got the same results, but it is running great like it did before without the steady dripping of fuel on the ground. Now I know I will get some better mileage. Thanks again.<br /><br />I still need to find those two clamps to get my turbo hooked up. Still haven't found any listings on the part numbers. One is shown in the illistrated parts breakdown but don't list a part number. <br /><br />One is a the exhaust clamp that hooks up the exhaust pipe to the turbo itself. Then the other is from the "Y" part that goes into the turbo.<br /><br />The part at the "Y" doesn't look like a place for any mechanical fastners. It just barely slides into the inlet of the exhaust part of the turbo. It has to be aligned up perfectly for it to slide in. I don't know if there is a metal shim, "O" ring, or whatever. I just don't know if they depend on the expansion from the heat of the exhaust to seal it up. This is not an ATI turbo, it is made by Garrett. I have had this turbo for a tad over a year and still can't get anywhere with it. <br /><br />I have too many projects going on right now to put time into finding the part I need. Eventually I will figure something out.<br /><br />Bomar, if your ever in the Mansfield area, look me up and I'll show you what I need. Thanks

Re: Diesel Injector "O" rings

Re: Diesel Injector "O" rings

Sometimes it is easier to find these parts in an off road or 4 wheeler parts dealer.

Re: Diesel Injector "O" rings

I like the Banks turbos.<br />That's what I had on my '93 with a 5 speed.<br />Sure a world of difference from the non turbos.

Re: Diesel Injector "O" rings

Originally posted by SBN:<br /> I like the Banks turbos.<br />That's what I had on my '93 with a 5 speed.<br />Sure a world of difference from the non turbos.

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I have old 85 6.9 and did change over to 7.3 glow plug system.. what a pain but well worth it.<br />Anyway a guy I know took the same 1985 F250 truck I have and installed a Banks Turbo with a 4" daul exhaust! He let me take it for a spin.. WOW it was like I was in another world! <br />Good thing he went along or I wouldnt have brought it back LOL

Re: Diesel Injector "O" rings

Your 6.9 is not a DT-444 IH engine with a few changes. It is an IH 6.9 naturaly asperated engine ane is approximately (549 cubic inches). The engine is acctually a remake of the old IH DV550. The DT-444 is turbocharged and has a split oil pressure system and all cumputer controlled. If you really want to see a big difference in power have an injector pump specialist reconfigure the fuel delivery on the pump. The cylinders would have that extra fuel to go with all tha extra air the turbo will give you.

Re: Diesel Injector "O" rings

Your 6.9 is not a DT-444 IH engine with a few changes. It is an IH 6.9 naturaly asperated engine ane is approximately (549 cubic inches). The engine is acctually a remake of the old IH DV550. The DT-444 is turbocharged and has a split oil pressure system and all cumputer controlled. If you really want to see a big difference in power have an injector pump specialist reconfigure the fuel delivery on the pump. The cylinders would have that extra fuel to go with all tha extra air the turbo will give you.

Re: Diesel Injector "O" rings

P/S I almost forgot. If you replace the orings on the injector you replace the dust rings. 90% of the time the injector returns are whats leaking. In your case if the fuel was leaking bad enough to drip on the ground it was not leaking past the orings, if so you would definatel have had a pronounce "miss". I you had the injector out you should have noticed a copper washer at the tip of the injector. This is what seals the cylinder and keeps the fuel in it. If the leak stopped after you replaced the dust rings it is probably because you resealed the return and didn't even know it. The next time you have this type of leak just pull off the return and reinstall it. If this does not stop the leak get some new return line. It is probably a good idea to go ahead and replace all the returns anyway. Your nose will probably appreciate it.

Re: Diesel Injector "O" rings

Banzaid, sorry I didn't specify, but my engine is a 7.3. During 94, Ford had three diesels that year. They had the 7.3 IDI non-turbo, 7.3 IDI with a Garrett turbo (very few), and then the beginning of the Powerstroke era. <br /><br />I like this engine due to no electronics. I have the slow and strong C6 tranny. The tranny is alot cheaper to repair than the newer electronic version.