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Oil filter adapter leaks no more!

Discussion in 'GM 6.5 Diesel Engines' started by HighSierra86, Jul 29, 2009.

  1. HighSierra86

    HighSierra86 Active Member

    Mar 30, 2009
    Northwest CT
    The oil filter adapter on my 95' has been leaking for quite some time now, so i decided to finnaly fix it last night while changing the oil. I dont know if theres any info on it here, so I thought Id take some pics and get the part #s.

    The adapter is bolted onto the LH side of the block with a large hex head bolt. (forgot the size already!) After removing the bolt the adapter will come right off. Pull the bolt out of the housing and you will notice 1 o-ring on the bolt itself, and another inside to seal the lower portion of the bolt. Both can easily be removed with a small pick or screwdriver. Also remove the large o-ring that seats the adapter to the block. All of my o-rings were hard as a rock and split into pieces when removing...thus the reason for my leak.

    After all o-rings have been removed, clean the entire adapter and bolt with a carburator/part cleaner or similar solvent. Pay special attention to the groves the o-rings will be seated into. Apply a thin film of oil to the new o-rings and place them in their proper location. All three are of a different size. Be sure to replace the copper washer between the bolthead and the adapter as well. Before bolting the adapter back onto the block, be sure that the mating surface of the block is clean as well.

    Re-tighten the bolt to its proper torque (someone will a service manual feel free to share this spec), install your filter and oil, and away you go! With no more leaks....from this location anyways.

    The part numbers for the three o-rings from GM are as follows:
    Big O ring 12559095
    2 small O rings 23500360
    Copper gasket 23500358
  2. 6.5TD Burb

    6.5TD Burb Member

    May 7, 2009
    Wendell, NC
    Good to know. I need to do this on my Suburban.
  3. mmcna

    mmcna Recruit

    May 6, 2008
    land of lincoln
    Same here, good to know
  4. bk95td

    bk95td 6.5 nut job/addict

    Nov 26, 2008
    There are 2 or 3 different styles of the oil filter adapters. The o-rings are different on all 3. Some didn't use the copper washer either.
  5. orrum

    orrum New Member

    Jun 6, 2011
    Orrum North Carolina
    I have a oil leak in that area. I tightened the valve covers up but still seeing oil on the filter. Do I have a adapter like this? I am ready to change the oil but if I need to put new adapter orings in order to fix the leak I need to know so I can get them. Also which ones do I need?
  6. Turbine Doc

    Turbine Doc Just Another Diesel Guy

    Not coming from there on yours Bill the adapter is on 4x4 6.5s I'm not sure if the 6.2 uses same adapter in the K series truck. You need to be posting your questions in 6.2 forum Bill while both engines are kissin cousins, there is enough difference in them that we segregated out to the 2 different engine types for Q&A.
  7. Acesneights1

    Acesneights1 New Member

    May 5, 2008
    Northeast CT
    yeah BK is right, I learned the hard way. There is atleast two different ones and the bolts are different. I chucked it on my 93 as I had a lift and no longer needed it.
  8. WarWagon

    WarWagon Well it hits on 7 of 8...

    Nov 15, 2009
    X3 on this! Got 95 parts and had the 93 oil filter adapter on the burb. Get dealer parts and make sure they are the right year. The nightmare for those of us with many years of engine parts to choose from gets tricky. 1993 uses the copper washer. 1995 uses an oring instead.
  9. orrum

    orrum New Member

    Jun 6, 2011
    Orrum North Carolina
    Thanks Doc I will post in the other forum.
  10. JMJNet

    JMJNet Recruit

    May 6, 2008
    Richardson, TX
    IIRC, Leroy PMDCable sells the o-ring kit. I am not sure for what year though.

    Great alternative if you cannot find it at stealership.

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