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Discussion Starter · #1 ·
I have a stock 460. Bought an RV from a guy who said it needed an oil pump and pick up tube. The guy who towed it for me replaced the oil pump. I didn't even ask him to which I'm still trying to wrap my mind around. Anyway, he said the pick up tube looked good so he didn't replace it.

Problem is, oil still won't reach the top of the motor. Today I put a pressure tester on it and spun the oil pump in reverse with my drill and a 5/16th socket. It was 104 degrees outside so the drill overheated quick, but Saturday, without a pressure tester on it, I let that drill spin for a long time, once for at least 5 minutes straight. All this over a span of an hour and still nothing out the rockers.

With the pressure tester on it as soon as I turn on the drill it jumps to about 2 PSI and that's it. What do you guys think it could be? I'm going to add more oil to see if I can get it to prime, after that, the only thing I can personally think of is to just redo the job with parts I bought myself and this time, replace the pickup tube. It's a lot of work, maybe, yes. But it's better than just trying a bunch of things for days on end.

Here is a video to what's going on:
 

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Early EFI 460's had a penchant for cracking the pick up tube at the flange and sucking air.

This is where I'd start.

It seems unlikely that any of the plugs have backed out.

You might lift the valve covers and check for bent push rods and lifters out of their bores.






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Discussion Starter · #4 ·
Exactly what I was thinking. When the mechanic told me, "I replaced the pump, but the pickup tube was good!" I was thinking, "You did all that work, should've just replaced it since you were there." I'll go stare at it tomorrow to try to figure out the best way to get around that crossmember.
 

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Discussion Starter · #6 ·
HI ,, Before you just add oil .. how much does the dip stick say is in it????

good luck take care be safe
tim
He removed the driver's side valve cover where the dipstick goes into. I wasn't going to run it with too much oil in it, just overfill it to prime it then change the oil again (because I have no idea what kind of oil he put in it.)
 

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Discussion Starter · #9 ·
HI the dip stick tube extension is just attached to the valve cover to hold it in place it doesn't go into the valve cover it still goes down into the oil pan.

good luck take care be safe
tim
Good to know! I'll have to look for it. When I started work on the engine it was already taken apart so I have to figure out some things. I asked them to not touch it for that reason, but I guess he wanted to surprise me with the repair, which was nice.
 

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Discussion Starter · #12 ·
HI, What size socket are you using to turn the pump with? Doesn't sound like its turning the pump..

good luck take care be safe
tim
It does seem to just spin very easily, but I'm using a 5/16th. When I try to turn it manually it spins easily CCW, but there's resistance Clockwise so I feel like the driveshaft should be fine.
 

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I know you'll have to re-time the distributor when you do this, but have you tried to turn the crankshaft over a lil bit then hit the oil pump? Or even turn the crank over a few times to be sure it still will? What I mean is try to turn the crank like 1/4 way then hit the drill, then another 1/4 turn.. and on a few times to see if you get a different result.. Are you getting any kind of resistance with the drill or does it feel as if it's just freewheeling? And yes I'd consider even overfilling it w oil to make sure there's enough to prime it with at this point..
 

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HI
The poster hasn't posted in a few days??
Where are you taking you pressure reading?? I believe the gauge should be hooked up at the flat spot (china rail) behind the intake where most of the sending units are at... you have the hose from the gauge going way forward of that spot along driver side of the motor???
Where are you taking your reading from??

good luck take care be safe
tim
 

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HHHMMMM. I must have caught him in a ploy to spoof us. As he vanished when I ask him to show us a video of how he was spinning the oil pump and what he was using..... looking at his video at 53 sec. in I think I see what he was using to spin the extension on the oil pump with. There's a red rag like thing attached to the end of a long shaft and what looks like maybe a drill on the other end. Maybe he was using the rag to take up the space and make a tight fit on the extension LOL which we know it won't it well just spin... So the pump would start but then gain to much pressure for the rag to not spin like 2 or 4 lbs.
Did some of the early 460 have the oil pressure sending unit on the side.. I kind of remember something like that on something??

tim
 

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I’m trying to help my neighbors son who just purchased a 75 f250 with a 460..
Every discussion on here I’ve researched about oil pressure loss seems to end without a resolution.
Hi,
Start your own thread .. This person was not turning his pump It takes a lot of pressure and he was not using the proper connection at his drill.. When I questioned him on it he quit replying??

good luck take care be safe
tim
 
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