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Old 04-11-2007, 08:02 PM
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Mellings Oil Pump

After the posts concerning the Mellings oil pump and solid motor mounts I decided to change my pump to the Select series. I looked at the M-55 stock pump and what a POS.. I can see why it would break.. Anyway I ordered the pump from my friends machine shop and it came in and I always pull them appart and check and clean.. Well one of the cap screws looked like it was loose so I took it out and the head was almost broke off.. I finished breaking it with my hands.. The screws look like they are cast.. Real cheap.. So I wrote Mellings and told them of the problems.. They overnighted me a new pump here to my house.. Same cheap screws so I went and got some grade 8 6mm screws with locks and put it in.. I have some "REAL" good oil pressure now.. I think they must put a little bit tighter spring in the relief.. Anyone else seen these cheap looking screws??

Mitch
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Old 04-11-2007, 11:36 PM
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I have had no problems with Melling. I put a high volume pump on my 350 4 years ago .
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Old 04-12-2007, 03:13 AM
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Mellings Oil Pump

I just bought a new Select series for my big block and I was real impressed with it,took it apart for a look and all was good,the cap screw bolts looked to be a quality peice.
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Old 04-12-2007, 09:04 AM
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These dont look like high quality bolts to me..

Quote:
Originally Posted by mitchc
After the posts concerning the Mellings oil pump and solid motor mounts I decided to change my pump to the Select series. I looked at the M-55 stock pump and what a POS.. I can see why it would break.. Anyway I ordered the pump from my friends machine shop and it came in and I always pull them appart and check and clean.. Well one of the cap screws looked like it was loose so I took it out and the head was almost broke off.. I finished breaking it with my hands.. The screws look like they are cast.. Real cheap.. So I wrote Mellings and told them of the problems.. They overnighted me a new pump here to my house.. Same cheap screws so I went and got some grade 8 6mm screws with locks and put it in.. I have some "REAL" good oil pressure now.. I think they must put a little bit tighter spring in the relief.. Anyone else seen these cheap looking screws??

Mitch
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Old 04-12-2007, 09:10 AM
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put a stock melling pump in most everything i build. Pump comes out of the box, gets taken apart & "massaged" and reassembled. Never had a problem.
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Old 04-12-2007, 09:42 AM
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Same here, been using melling oil pumps for 20 years, no problems as of yet. Those sure aren`t the same cap screws that we used in any pumps I bought.
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Old 04-12-2007, 10:10 AM
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I"ve used the stock M-55 pump in my last 4 engines and consistantly get 50+ pounds out of the box. Never seen a bolt like that before either!
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Old 04-12-2007, 10:18 AM
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I am holding a Melling 10552 pump in my hands as I write this. It has the same bolts as are in the pic. You can bet your sweet bippy that I am going to check the bolts and everything else VERY carefully!

tom
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Old 04-12-2007, 11:05 AM
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After I received the new pump I put the old one back together and was using a 1/4 ratchet and allen socket and snapped another head off. The bolts look to be cast...


Quote:
Originally Posted by machine shop tom
I am holding a Melling 10552 pump in my hands as I write this. It has the same bolts as are in the pic. You can bet your sweet bippy that I am going to check the bolts and everything else VERY carefully!

tom
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Old 04-12-2007, 01:17 PM
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I copied and pasted this from another site, but I think melling oil pumps have had some trouble.



got this from a Camaro site I still visit. First I heard of this. I don't know if any of you have picked up on this but it has to do with a change Melling made in their oil pump castings and it sounds like the weaker castings may have some problems.


http://www.nastyz28.com/forum/showthread.php?t=65870
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Old 04-12-2007, 01:33 PM
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Quote:
Originally Posted by Mustangsaly
I copied and pasted this from another site, but I think melling oil pumps have had some trouble.



got this from a Camaro site I still visit. First I heard of this. I don't know if any of you have picked up on this but it has to do with a change Melling made in their oil pump castings and it sounds like the weaker castings may have some problems.


http://www.nastyz28.com/forum/showthread.php?t=65870
it seems to be a legit problem... any changes on melling's other oil pump applications?
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Old 04-12-2007, 01:58 PM
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Melling recommends to use the M-Select oil pump



moroso recommends using pumps p/n 22138, and 22139

melling makes morso pumps
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Old 04-13-2007, 04:06 PM
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Thanks for the heads up! Any one know when they made the change? I really don't want to pull my oil pan to find out if I got the new casting.

Thanks
Jordon
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Old 04-13-2007, 04:49 PM
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I'm going to start installing better bolts on the pumps I sell (and use).

I have an original oil pump from a 1969 327. The casting is practically identical to the newer, weaker casting. Apparently they beefed up the casting sometime after that, but some bean-counter or genius engineer decided that was too good of an idea so they went back to the original, weaker design......

tom
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Old 04-14-2007, 05:24 PM
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Mellings Oil Pump

Well ,looks aside, after reading what everyone here has to say about these bolts,I think that maybe I will change mine before I actually put it in my soon to be rebuilt motor.Theres always enough to worry about,I dont want my oil pump to be one of them !!!
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