6.9 oil pump?
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7th Gear
Joined: Nov 2023
Posts: 7
Likes: 1
6.9 oil pump?
Greetings, I've got an 85 f350 6.9 it's been sitting 20yrs started a few times s year.57000
Original miles. We went to start it up s couple months ago and it's giving a horrible racket and no oil pressure on gauge. But it runs. What could have happened to I?
Original miles. We went to start it up s couple months ago and it's giving a horrible racket and no oil pressure on gauge. But it runs. What could have happened to I?
Laughing Gas
Joined: Jun 2007
Posts: 1,106
Likes: 35
From: Virginia
If no pressure, your gage or sender could be bad. Check the oil. The oil pump could have failed, screen blocked, no oil, bad or spun bearings.
I would go to one of the big stores and purchase a mechanical oil pressure gage kit and connect it where the oil pressure sender is installed in the block.
I would choose to disconnect the power to the fuel solenoid so the truck won't start, then crank it a few times to see if your oil pressure builds. If pressure builds, connect the wire to the fuel solenoid, start the engine and hope to get a fairly accurate reading of your oil pressure.
I hope this helps. Keep us posted.
Mountain Pass
Joined: Oct 2021
Posts: 222
Likes: 60
BTW The oil pressure port on the IDI has an "extension" screwed into the block. It's 5/8 hex. Hard to get a wrench on it, even my crow's foot / ratchet wouldn't fit. I cut an open end wrench down and smoothed off the cut end.
I past posted about jumpering the resistor on the dash cluster if you want to run the actual guage Sender instead of the warning Switch. The resistor is there to emulate the Sender being near middle of its resistance range, thereby causing the guage to see middle range all the time.
Boy I remember hitting really steep hills in my Baja Bug and seeing that oil light flicker (6psi or no oil at all). Was really scary far from home...no cell phones.. never lost an engine though....ah to be young again...
I past posted about jumpering the resistor on the dash cluster if you want to run the actual guage Sender instead of the warning Switch. The resistor is there to emulate the Sender being near middle of its resistance range, thereby causing the guage to see middle range all the time.
Boy I remember hitting really steep hills in my Baja Bug and seeing that oil light flicker (6psi or no oil at all). Was really scary far from home...no cell phones.. never lost an engine though....ah to be young again...
Thread Starter
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7th Gear
Joined: Nov 2023
Posts: 7
Likes: 1
BTW The oil pressure port on the IDI has an "extension" screwed into the block. It's 5/8 hex. Hard to get a wrench on it, even my crow's foot / ratchet wouldn't fit. I cut an open end wrench down and smoothed off the cut end.
I past posted about jumpering the resistor on the dash cluster if you want to run the actual guage Sender instead of the warning Switch. The resistor is there to emulate the Sender being near middle of its resistance range, thereby causing the guage to see middle range all the time.
Boy I remember hitting really steep hills in my Baja Bug and seeing that oil light flicker (6psi or no oil at all). Was really scary far from home...no cell phones.. never lost an engine though....ah to be young again...
I past posted about jumpering the resistor on the dash cluster if you want to run the actual guage Sender instead of the warning Switch. The resistor is there to emulate the Sender being near middle of its resistance range, thereby causing the guage to see middle range all the time.
Boy I remember hitting really steep hills in my Baja Bug and seeing that oil light flicker (6psi or no oil at all). Was really scary far from home...no cell phones.. never lost an engine though....ah to be young again...
Thank you
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