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Old 10-03-2011, 07:02 PM
Pipeliner08 Pipeliner08 is offline
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bad oil pump??

ok i just baught a 92 ford 7.3 idi about 20 minutes out of town and when i got the truck home it started idleing rough and showing no oil pressure i shut it off and left it for the next day i go to start it and it was fine had good pressure until it warmed up and then oil pressure dropped and truck died instantly. since then ive put new injectors and return lines and changed the oil. the oil has no coolent in it or signs of diesel either. but now it wont start at all unless its cranked over a bunch and then dies once started and ive notice as im turning the truck over the oil pressure guage takes a while to show anything and then when it does its in spurts.if you stop cranking the oil pressure drops imediately so my question is do you think its an oil pump? or a cracked feed tube on thepump? i dnt think its a bearing cuz in my experience it wont build pressure while cranking. any help would be much appreciated!!! also can the pan be removed with the motor still in the truck if you unbolt the mounts and jack it up?
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Old 10-03-2011, 07:52 PM
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IDIDieselJohn IDIDieselJohn is offline
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Do you have a real gauge or factory dummy dash gauge?


And sounds like you have air intrusion.
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1990 Ford F250 4x4, ZF5, L/S 4.10, N/A 7.3L Diesel, 568,808km/377,497 miles, still on the original clutch!
1989 Ford F150 300-6, C6, 2.73, 135,000km/84,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 277,000km/173,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 670,000km/419k miles
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Old 10-03-2011, 08:09 PM
Pipeliner08 Pipeliner08 is offline
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I havnt isntalled my mechanical guage yet but the stock seems to be working cuz the truck shut off as soon as the guage dropped and u can see it move as it turned over. I kno their notorious for being spuratic but mine seems to be working plus the red oil light is been on ever since this problem has started. Also the truck doesnt try to start till the pressure builds up on the gauge wich i would assume is let the ip do its job
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Old 10-03-2011, 08:45 PM
LSO1123 LSO1123 is offline
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I'm a noob so don't take this as the gospel but I don't think the oil has anything to do with the IP in an IDI. The PSD uses a HPOP to work the injectors but not the IDI. I may be getting ready to get schooled on this though.
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Old 10-03-2011, 08:50 PM
Pipeliner08 Pipeliner08 is offline
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Well i couldnt tell u if you are correct or not as i am not familiar with diesel engines i just thaught the injector pump was controlled by oil pressure and would be shut off if oil pressure dropped. Wat is a psd? And i thaught the non turbo 7.3 didnt have a high pressure oil pump?
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Old 10-03-2011, 08:52 PM
Pipeliner08 Pipeliner08 is offline
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Do you think maybe the injectors are not seated right and that would cause it?
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Old 10-03-2011, 08:52 PM
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PSD (PowerStroke Diesel).


The old non turbo 7.3 has a mechanical injector pump gear driven by the cam gear.

Even with no oil in the engine, it will start up. (I wouldn't recommend that tho)
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1990 Ford F250 4x4, ZF5, L/S 4.10, N/A 7.3L Diesel, 568,808km/377,497 miles, still on the original clutch!
1989 Ford F150 300-6, C6, 2.73, 135,000km/84,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 277,000km/173,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 670,000km/419k miles
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Old 10-03-2011, 08:58 PM
Pipeliner08 Pipeliner08 is offline
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O ok good to know. So then what is making the oil pressure drop and kill the motor?
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Old 10-03-2011, 09:02 PM
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Coincidence?


When you replaced injectors, did you replace both return lines and plastic T's?
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1990 Ford F250 4x4, ZF5, L/S 4.10, N/A 7.3L Diesel, 568,808km/377,497 miles, still on the original clutch!
1989 Ford F150 300-6, C6, 2.73, 135,000km/84,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 277,000km/173,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 670,000km/419k miles
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Old 10-03-2011, 09:10 PM
Pipeliner08 Pipeliner08 is offline
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Lol i dont know if itscoincidence because its done it twice as soon as it warms up idle gets ruff red oil light comes on oil pressure drops and motor dies haha im stumped
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Old 10-03-2011, 09:11 PM
Pipeliner08 Pipeliner08 is offline
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And yes all were replaced i baught an instalation kit
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Old 10-03-2011, 10:24 PM
Herb Brooks Herb Brooks is offline
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My bet the two symptoms are unrelated. Sounds like air. These trucks have a tendency to have broken fuel pickups in the tank and coinciedently when you got home you were at the end of the tank that could be pumped up to the engine. dump a few gallons of fuel in and bleed the system. bet she will run. could be the engine was dieing and caused the oil preasure to drop. And you automatically related the two. If it does restart and run after the fuel addition and bleed keep a close eye on the oil preasure and run the s*** outa tha thing.
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Old 10-03-2011, 10:40 PM
Pipeliner08 Pipeliner08 is offline
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Yes that would make sense but before i changed the injectors i added five gallons of fuel and some injector cleaner and yes the truck started and ran smoothly until engine got up to running temp then i lost oil pressure and the truck dies
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Old 10-03-2011, 10:43 PM
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Get a real gauge then go from there
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Old 10-03-2011, 10:48 PM
Pipeliner08 Pipeliner08 is offline
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Can anyone tell me where its loacated? I think i see the sending unit on the back of the motor from up top but is that where i wanna put the mechanical guage?
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Old 10-03-2011, 10:48 PM
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