Melling M57B

[scott foxwell]

What's different about it? Anyone use one? Suitable for high performance use?

[blykins]

Standard volume, but has same spring as HV pump, so it will have about 10-15 psi more than a standard volume.  Basically pressure of a high volume, but not high volume....

[scott foxwell]

Standard volume, but has same spring as HV pump, so it will have about 10-15 psi more than a standard volume.  Basically pressure of a high volume, but not high volume....

Thank you.

[CaptCobrajet]

That's the only one I use.

[scott foxwell]

That's the only one I use.

Thanks Blair. So, I'm used to taking oil pumps apart and bluprinting them. Smoothing out the passages, getting rid of rough spots, maybe doing a little anti cavitation work...but I see these Ford pumps aren't really made to be taken apart. How do you get the bypass assembly apart? Do you have to destroy the plug to get it out? I can see drilling it and using a slide hammer to get it out...but then what? Can you get replacement plugs or do you tap the hole for a set screw?

[CaptCobrajet]

Precision Oil Pumps will sell you any pieces you need.  Doug is a good guy.

[cjshaker]

Precision Oil Pumps will sell you any pieces you need.  Doug is a good guy.

Must be something about the name...I don't know 

[scott foxwell]

Precision Oil Pumps will sell you any pieces you need.  Doug is a good guy.

Thanks. Maybe on the next one. I'm going to button this thing up this weekend. I'll just play with it myself. Thank you for the input!

[gt350hr]

  Scott ,
     In a pinch , "I" have pulled the plug as you mentioned and welded the hole up.  Replaced the plug and "staked" it in place. Spme pickup flanges have an extension to prevent the plug from popping out. I even used a pop rivet once.

[scott foxwell]

  Scott ,
     In a pinch , "I" have pulled the plug as you mentioned and welded the hole up.  Replaced the plug and "staked" it in place. Spme pickup flanges have an extension to prevent the plug from popping out. I even used a pop rivet once.

Thanks for that. Never considered welding up the hole in the cup. I was just going to thread the casting and make a plug. I'll play with it some this weekend. Thanks again.

[scott foxwell]

Well, that cup turned out to be something very hard and brittle. It came out in little pieces...eventually. I drilled a hole in it...with a carbide drill, bexause a HSS drill wouldn't touch it. Couldn't get a screw started in it to pry on so, since I was committed, I had to dig it out. That was no fun.
But...I managed. I got my work done on the housing and this was my solution to replacing the cup;




Had to drill and tap the housing for a 5/8-18 thread and then make a plug in the lathe.















All ready to go back together.

[blykins]

You think that straight thread will seal?  Pipe thread maybe better?

[scott foxwell]

You think that straight thread will seal?  Pipe thread maybe better?

I'd have very little control over the depth of the plug with a pipe thread. I do this with BB Chev pumps all the time to make the bypass adjustable. I'll test this in a bucket of oil and once I have the pressure I want I'll use Loctite on it. I think it'll seal just fine. Most of the sealing will be from the shoulder at the bottom of the hole.

[jayb]

Nice work!  I agree that Loctite should seal it. 

[Nightmist66]

You may want to think about spot facing the surface for the bolts going into the block while you're at it. If you snug one down with a precision flat washer, it looks ugly.