injector pump
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Junior User
Joined: Dec 2006
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From: poteau ok
injector pump
hey guys its been a while since ive showed my face around here.... any way i just bought a 85 f-250 with a 7.3 diesel in it and was wondering how to change the injector pump in it. my father said thats like putting a distributor in a gas engine and if you mess it up youll effectivly mess up the motor. any help on the matter would be greatly appreciated. step by step instructions would be awsome but again any information would be great. thanks guys and gals.
Sincerly,
General Lee
Sincerly,
General Lee
Posting Guru
Joined: Sep 2002
Posts: 1,897
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From: Northeastern Pa - USA
why do ya want to do that ?
Remove the air cleaner...tag and remove the wiring from the pump. Inside the oil fill neck is 3 little bolts , i believe 5/16 12 point and probably got some locktite on them so they are a little stiff to loosen (dont drop them in the engine and dont loose them. Loosen all the injection lines from the injectors. remove the 9/16 nuts from the mounting flange on the back side ... these hold the injection pump to the engine. take the whole shabang (pump and injection lines) off like a huge butterfly.
dont remove the pump drive cover and the drive gear !!!!!
Remove the air cleaner...tag and remove the wiring from the pump. Inside the oil fill neck is 3 little bolts , i believe 5/16 12 point and probably got some locktite on them so they are a little stiff to loosen (dont drop them in the engine and dont loose them. Loosen all the injection lines from the injectors. remove the 9/16 nuts from the mounting flange on the back side ... these hold the injection pump to the engine. take the whole shabang (pump and injection lines) off like a huge butterfly.
dont remove the pump drive cover and the drive gear !!!!!
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
If you do have a 7.3 engine, the IP drive gear bolts will be behind the oval plate with two bolts holrding it on.
An 85 should have a 6.9, many of those had a bolt on fill spout that covered the bolts.
An 85 should have a 6.9, many of those had a bolt on fill spout that covered the bolts.
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Junior User
Joined: Dec 2006
Posts: 59
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From: poteau ok
wait so what you guys are sayin is pull the entire injection system off? that sounds a little harder to do than just replace the pump. please clerify this..... im sorry guys new be here and am seriously misunderstanding or am understanding and just dont realize it. again sorry talk to you guys tomorrow
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
You leave the injectors in, but the injector pump and injector lines come out as one assembly. While it may be possible to take the lines off first one by one, its MUCH easier to take IP and lines out as one assembly. Be carefull not to bend the lines.
The steel fuel line that connects the fuel filter head to the IP will have to be removed first.
The steel fuel line that connects the fuel filter head to the IP will have to be removed first.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Getting the fuel lines loose from the IP with the IP still mounted is very hard, not enough room to get to the bottom lines.
Also since the IP has to slide to the rear to get the shaft out of the IP drive gear, the lines would be in the way.
On a non turbo motor, it is much easier to loosen the lines from the injectors, remove the fuel supply line and return line from the IP, then loosen the drive gear bolts and the IP mounting nuts and remove the IP and injection lines as an assembly.
The only thing you do not want to do, is unmesh the IP drive gear from the cam drive gear.
Doing that makes it harder to get the gears back in time so the injection timing is correct.
Also since the IP has to slide to the rear to get the shaft out of the IP drive gear, the lines would be in the way.
On a non turbo motor, it is much easier to loosen the lines from the injectors, remove the fuel supply line and return line from the IP, then loosen the drive gear bolts and the IP mounting nuts and remove the IP and injection lines as an assembly.
The only thing you do not want to do, is unmesh the IP drive gear from the cam drive gear.
Doing that makes it harder to get the gears back in time so the injection timing is correct.
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