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What size oil pump primer


raggadie

Active Member
Joined
Mar 11, 2014
Messages
34
Vehicle Year
1986
Transmission
Automatic
I am just about ready to install my new engine onto my ranger, but I still need a few more parts before I go on with the installation.

I have been to several auto-parts stores, and none of them know what size oil pump primers I need for my 2.9 engine. There is a 1/4 and a 5/16, both made for Fords.

Can someone please tell me which one will work for this engine. I have to prime it, so I don't void my warranty.

Thanks,
Ross Wood

P.S. I searched through the forums so I wouldn't have to start a new thread, but I had no luck finding any information.
 
Honestly, don't mess with it. Put one quart in the filter, 4 in the crank case, start it, and don't touch the throttle until it stops clattering.

If the engine can't survive being dry for the few seconds that it will take for the pump to prime itself it's not put together very well.


The other thing you can do to prime the pump, before you put it in the truck you can remove the distributor, put a 1/4" socket on a drill, and run the pump with the drill for a minute. That will get the oil pump primed and the system filled without spinning the engine itself.
 
Do you know which size it is? I have to do it to keep the warranty good.

Ok so it is a 1/4, ok that's all I needed to know. Thanks for the help.
 
Last edited:
I have to do it to keep the warranty good.

You do know that the warranty guys from the reman company are not going to be standing there with a oil pressure gauge hooked up watching as you fire it up the first time, right?
 
Yes, I am aware, but if I have to send the engine back for anything and there is more damage that should be there that's enough for them to use that reasoning even if it wasn't me that caused it. Therefore, saying it was done, and proof a receipt is more than enough.

I just need to know the size, you did say that a 1/4 socket, but is this the same as the tool itself?
 
I'm saying run the oil pump itself with a drill and a socket on the oil pump drive rod, rather than waste money one of those pressurized cans of oil.
 
Either way money is going to be wasted on the extension, or the tool. I also honestly doubt a socket would go down in that hole. Granted, it might.

Also, I can loan a tool, so it wouldn't cost me anything. I just need to know which one it is. 1/4 or a 5/16

I have also heard that a tool might not be made for this engine. If that is the case I would have to use a distributor.
 
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I don't know the size of the oil pressure port. You can get a 1/4" 1/4 drive socket on the oil pump drive rod. You might need to find a thin-walled one, but it can be done.
 

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