Oil pump quality

[Ghoste]

 I can't find it now of course but I'm sure someone on this site (bsb67 maybe??) had reported finding a lot of issues with current oil pumps and it was all makes.  I looked on a couple of other sites too and couldn't find it so maybe I'm imagining this?

[resq302]

I also remember something about that but I can't remember what forum it was on. Something about them not having the proper tolerances or something like that if I remember correctly.

[fy469rtse]

Yes I asked something awhile ago ghoste,
Blue printing oil pump, quality , cast flash , clean up of passages , high volume versus normal ,
Yes new pumps quality leaves a lot to be desired ,
Search blue printing oil pump 

[BSB67]

I do have heart burn over the quality of the current offering of Melling pumps.  I purchased several pumps over a period of time in the mid and late 2000's.  The issues were the same.  I have not purchased one lately, and possibly they are better.

The reality is that they sell thousands of these pumps and people use them without issue.  Oil pumps are pretty simplistic devices, and can function adequatly inspite of the poor quality.  They have figured out, as with a lot of companies, that there is no point in putting additional cost into product quality if almost no one cares.  I'm just one of those guys that does care.

If you have a natural eye for quality, or lack there of, I think you can take one apart and see for yourself.  If you compare it to a factory original, you will see a difference as well.  

Generally the rotors seem okay, but I would prefer less end play.  If you just follow the path of the oil, I think you will find a lot of oppertunities to improve its journey.   The worst part is the misalignment of the two halves at the pressure discharge.  You need to elongate the screw holes and rotate the cover to get it closer, and then to improve the alignement/transition further, you will need to re-drill the holes which almost puts you into the o-ring groove.

But that is me being me.

[firefighter3931]

I've had good luck with the Melling pumps. Usually just disassemble for a quick cleaning and inspection....then off to the races.

I like the HV pump with .0025 main/rod clearances....plenty of pressure even at hot idle (45-50 psi)



Ron

[John_Kunkel]

Same here, I just disassemble them and remove the casting flash from the kidney-shaped inlet opening...lube with Vaseline and run 'em.

[68CoronetRT]

I've been running the Melling HV pump for a while now and the only issue was the seal inside the main housing was cracked right out of the box. Unfortunately I found this out the hard way and had to remove the pump after I fired the motor for the first time since that was the only leak. But I had a fresh o ring from my old pump and swapped it over and no more leaks ever since.