I have a 2002 450 with a V10, currently it had a bad oil pump and motor ate itself. I just bought a brand new takeout from a 2000 F250, my question is should I swap in my brand new oil pump I bought? Its a melling and literally bought to replace the one in my 2002 v10 hoping it would free up and run.


What do you think? Leave the OEM one in there that has 0 miles? or replace it before I install it in the van?

 

Good question. I'd leave well-enough alone

It's a brand-new V10?

 

Yep its a new takeout from a Roush F250 project. Least thats what I was told. Looks to be brand new, manifolds have never been hot, everything looks 100%

Got a great deal on it as well.

B

 

If it's an OE replacement Melling pump-don't use it on the engine. The Melling oil pump gears do not have the enough hardness or wear resistance on the face of the rotors. I've got a set of gears from a Melling 2V replacement pump that have .007" wear on them in just a mere 10K miles. In contrast, I have 3 different OEM pumps that have well over 100K miles on them that the gears have absolutely NO measurable wear whatsoever on them. With a very close tolerance on oil pump gears of just .004" tip-to-tip clearance on the rotor section of the pump when stock, it is absolutely vital that the rotors keep this clearance to have good oil pressure. Melling does have some "high performance" modular oil pumps that have some kind of billet gearset-but I have no experience with them, so I won't comment on them.
JL

 

JL, I'd rep you, but can't again so soon...

 

Performance pumps aren't worth the light of day unless you adjust the relief valve to allow more pressure (which in turn will adversely affect the engine). Otherwise all your doing is keeping the relief valve off its seat more than it needs to be.

 

Generic logic on this subject DOES NOT fit the modular.
The only difference in the "performance" pumps vs the OE pumps is the material that the gearset is made of. OE gears are powdered metal, and most of the aftermarket gearsets are of some kind of a solid "billet". The problems come with the hardness of the gearset-most all of the aftermarket pumps(even stock replacements), do not come anywhere near close to the hardness of the OE gears, and of course, they wear...quickly in some cases. If they use the wrong material for the application, it can actually "smear" the rotor tips,and cause pump housing wear, which itself leads to pressure stability issues, low pressures,and internal leakage.
JL