NEED HELP!!!!
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Senior User
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NEED HELP!!!!
ok i just put my motor back together after replacing the glow plugs, injectors, vacuum pump and some other things. i tried to turn it over and i get nothing, it turns over fine and even fired for about 4 seconds then died, the timing is correct i know that, other than that i dont know where to start, its a 6.9 banks turbo diesel.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
Charge the batteries, loosen several injection lines, crank the engine over and bleed the air out of the injection system.
When you get fuel back to the injectors, tighten the fuel lines, let the glow plugs cycle and it should fire off.
Caution, 20 seconds is the max cranking time, then 2 minutes cool down time for the starter before cranking again.
When you get fuel back to the injectors, tighten the fuel lines, let the glow plugs cycle and it should fire off.
Caution, 20 seconds is the max cranking time, then 2 minutes cool down time for the starter before cranking again.
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i think i blew the starter trying to turn it over too much, i was thinking about loosening the injector lines though for sure, i dont think its that simple though, cause when it started for a second it was damn near redlining. anything else maybe?
Senior User
Joined: Aug 2009
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From: Omaha, NE
I'm not a diesel mechanic but from what i do know is when you replaced your injectors you got air into the lines so it may take some cranking to get all that air out...if possible you should have someone crank the engine while you bleed the system..You can do this by pressing the schrader valve(tire valve stem) on the fuel filter housing...I beleive the 6.9 you have is the same as the 7.3 i have as far as the mounting of the filter...when you see diesel start spurting out as it is cranking you have bled the system up to that point...NOTE: DO NOT RUN THE STARTER FOR MORE THAN 20 SECONDS AT A TIME...Wait 2 mins after cranking to let the starter cool off..
NEXT: Did you have the new injectors pop-tested? If not the problem may lie within the injectors...
Hope this helps...if i'm wrong on this, i'm sure someone will be behind in a bit to correct me.
NEXT: Did you have the new injectors pop-tested? If not the problem may lie within the injectors...
Hope this helps...if i'm wrong on this, i'm sure someone will be behind in a bit to correct me.
Elder User
Joined: Oct 2007
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Even if it ran shortly, but was basically running away, that really points to air in the lines. Dave S. knows these IDIs, so I'd definitely check into what he's said. If I run mine too low on fuel, I get air intrusion, and it will run away, seems like it's going to frag itself. Did you fill the fuel filter with something (diesel fuel, diesel kleen, atf?) prior to trying to start it the first time?
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i was thinking air in the lines to cause i know diesels are really sensitive about that. i will check it out tomorrow for sure, i got worried though cause when it did start it was like redlining for two seconds then died, and where can i go to get my injectors tested? they are brand new so does that make a difference?
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the fuel filter is full of 90% diesel and 10 diesel kleen. and to the best of my knowledge all the air is bleed out of the lines. so i dont know, im taking it back apart tomorrow so well see what happens.
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No.
David85 is asking to be sure you didn't. If reassembled wrong, it could lead to destructive run-away. I don't know the details, as it's about the only mistake I haven't made.
My guess is that you bumped one or more of the return lines and now they are letting air in. Once you get it running again, if it starts and then dies after sitting all night, then you'll probably need a return line kit...
Good luck and hope your starting is not toast.
David85 is asking to be sure you didn't. If reassembled wrong, it could lead to destructive run-away. I don't know the details, as it's about the only mistake I haven't made.
My guess is that you bumped one or more of the return lines and now they are letting air in. Once you get it running again, if it starts and then dies after sitting all night, then you'll probably need a return line kit...
Good luck and hope your starting is not toast.
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Senior User
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the solenoid on the starter is done i ordered another one though, i got a brand new return line kit and there are no leaks, ive double checked everything and replaced so many parts, i dont know what to do anymore, lol all this help is awesome though guys, thanks
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
Air in the injection lines causes to much fuel to be injected as long as there is some fuel in the lines.
Fuel can not be compressed, air can.
With just fuel in the lines, the injectors pop open, pressure drops quickly and the pop closed.
With fuel and air in the lines, air compresses, so the injector pops open, air expands keeping the pressure high longer before the injector pops closed.
Once the fuel is replaced by air only, there is nothing for the engine to run on.
Fuel can not be compressed, air can.
With just fuel in the lines, the injectors pop open, pressure drops quickly and the pop closed.
With fuel and air in the lines, air compresses, so the injector pops open, air expands keeping the pressure high longer before the injector pops closed.
Once the fuel is replaced by air only, there is nothing for the engine to run on.