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Melling oil pump

Discussion in 'Early CJ5 and CJ6 Tech' started by grannyscj, Mar 16, 2006.

  1. grannyscj

    grannyscj Headed to the Yukon

    This is for those of you that have installed the Melling K-201HV kit (AutoZone $24.99), w/o the thrust plate kit. Any issues w/ extra wear on the housing or impeller?:v6:
     
    grannyscj, Mar 16, 2006
    #1
  2. sparky

    sparky Sandgroper Staff Member Founder

    See my "Backfired, died" thread. :(

    Mine was waaaayyyy too tight and I have some wear after a couple hundred miles.

    I have a package from TA Performance waiting on me when I get back home this afternoon. Should be my new oil pump. Not high volume, but with their adjustable pressure rate spring, shims to get the proper spacing and a girdle plate for the cover.

    At least get the shim kit from TA if you use the Melling, that's my experience though. I've not seen anyone else that's had any issues. I'm just lucky I guess.
     
    sparky, Mar 16, 2006
    #2
  3. grannyscj

    grannyscj Headed to the Yukon

    Yep, its sold two ways, by itself and as a package w/ the thrust plate.
     
    grannyscj, Mar 16, 2006
    #3
  4. sparky

    sparky Sandgroper Staff Member Founder

    Thrust plate, meaning a steel plate that covers the Al cap of the oil pump that's stock?

    Either way like I said, I'd pay the $14.95 for the shim kit from TA Performance to get the proper end clearance.
     
    sparky, Mar 16, 2006
    #4
  5. grannyscj

    grannyscj Headed to the Yukon

    I had to go do an x-ray mid reply and the thread changed.R) That's just the kind of thing I was worried about. The engine has never had any oil pressure problems yet and w/ only 26K miles I think I'll pass on the HV pump at this point. Thanks Sparky.:v6:
     
    grannyscj, Mar 16, 2006
    #5
  6. sparky

    sparky Sandgroper Staff Member Founder

    Sorry, I edited it. :oops:

    I searched for the PN to confirm what I thought it was and edited my reply then.
     
    sparky, Mar 16, 2006
    #6
  7. grannyscj

    grannyscj Headed to the Yukon

    I wonder if I can just change the spring. Oil pumps are positive displacement so I should be able to modify the pressure that way if I need to. Right? It would be an easy fix even after the engine is back in the jeep and I've checked it out.:v6:
     
    grannyscj, Mar 16, 2006
    #7
  8. sparky

    sparky Sandgroper Staff Member Founder

    Hold off until I get my adjustable spring put in from TA Perf. I'll let you know how well it works. ;)

    Won't have any effect on pressure at idle but at higher RPM it will.

    Supposed to be better than a color coded spring, you can "tune it" to your needs.
     
    sparky, Mar 16, 2006
    #8
  9. grannyscj

    grannyscj Headed to the Yukon

    Sounds cool. After I get it all back together, if I don't like the pressure I'll holler at you. Thanks.:v6:
     
    grannyscj, Mar 16, 2006
    #9
  10. michigan_pinstripes

    michigan_pinstripes I'm not lost, I'm wandering

    I have just been researching this very subject and stumbled upon a really good write-up over at TB. I plan on re-tracing this guys procedure, with fresh photos, and bringing it over here as a tech write-up. It received solid reviews over there! We are going to try this out on Jerry's 225 then repeat it on my 231.

    I have read mixed feelings about the HV kit (not absolutely neccessary) and the TA shim kit appears to be the ticket for a precise tolerance 8)

    http://turbobuicks.com/forums/showthread.php?t=39169&highlight=oil+pump
     
    michigan_pinstripes, Mar 16, 2006
    #10
  11. Jeepsterman

    Jeepsterman I had a beer with Panzer.

    Jon,

    Let me know if you guys need a hand. I wouldn't mind seeing this done as I will have do it at some point this spring.

    Definately post what you think Sparky. I figure I might as well replace while the engine is out.
     
    Jeepsterman, Mar 16, 2006
    #11
  12. Mcruff

    Mcruff Earlycj5 Machinist

    I wouldn't use all of this guys write up. I actually have all the photos outlining a complete rebuild of the pump and adding the Mellings kit. He shortcutted alot out of his rebuild that I included in my photos and such. He also screwed up by lapping his bottom cover to the suppossed 4 micron finish. When mating a gasket surface you want a rougher surface so the gasket has something to bite against. Thats why there is a spec for a head surface on engine blocks, so the head gaskets don't float around. My engine idles with 40psi of presure once its warmed up, and runs 60-70psi at 2500rpm.
     
    Mcruff, Mar 16, 2006
    #12
  13. sparky

    sparky Sandgroper Staff Member Founder

    FWIW the TA Performance kits are Melling kits but the adjustable pressure regulator and mylar shims are theirs. So buy the oil pump from Autozone sheeper and get the adjustable regulator and shim kit from TA Performance IMO.
     
    sparky, Mar 17, 2006
    #13