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225 V6 Timing Chain Replacement

Discussion in 'Early CJ5 and CJ6 Tech' started by OzFin, Jan 7, 2016.

  1. Jan 7, 2016
    OzFin

    OzFin Vintage Jeep Guy

    Michigan
    Joined:
    Jul 16, 2007
    Messages:
    936
    I am gathering parts & materials to do a timing chain replacement on a 225 V6. Will I need sealant for any of the timing chain cover bolts?
    The service manual states "Lubricate bolt threads before installation. Install the mounting bolts and torque 25 to 33 lb-ft".
    Reading this I take it that none of the bolts pass into the water jacket so bolt thread "sealant" will not be necessary, just a "lubricant"...is this correct?
    Thanks,Oz
     
  2. Jan 7, 2016
    jackdog

    jackdog Member

    Finger Lakes NY
    Joined:
    Jul 16, 2013
    Messages:
    526
    I have rebuilt several of these engines and use oil to lubricate the threads. No sealant is needed. I usually run taps down all bolt holes into the block to clean the threads.
     
  3. Jan 7, 2016
    oddfirejeeper

    oddfirejeeper Active Member

    Hamilton, MI
    Joined:
    May 5, 2004
    Messages:
    1,253
    yes you will need sealant on the long bolts. i believe those go into a water jacket. this is on the water pump if i remember right. i could be wrong but what will it hurt if you put a dab on there.
     
  4. Jan 7, 2016
    oddfirejeeper

    oddfirejeeper Active Member

    Hamilton, MI
    Joined:
    May 5, 2004
    Messages:
    1,253
    the only thing it will hurt is it will throw the torque value off a bit but not that much to matter.
     
  5. Jan 9, 2016
    djbutler

    djbutler Sponsor

    Rio Linda CA
    Joined:
    Nov 5, 2007
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    727
    Plan on an oil pan gasket set as well. The way the timing cover sets are sold includes a short little piece of cork gasket to replace the front lip of the pan gasket, but these are really tough to get into place and get the timing cover back on over the dowel pins.
    Lots easier to remove the pan, get it all cleaned up and put it back on with a new one piece gasket after the timing cover is back in place.

    Don
     
  6. Jan 11, 2016
    OzFin

    OzFin Vintage Jeep Guy

    Michigan
    Joined:
    Jul 16, 2007
    Messages:
    936
    I had seen the little pan gasket piece that comes along with the cover gasket to do the job. I agree that a full oil pan gasket would be better. Thanks for the input.Oz
     
  7. Mar 24, 2016
    KBH

    KBH New Member

    Tucson, AZ
    Joined:
    Mar 21, 2016
    Messages:
    13
    This is probably way too late, but... To change the timing chain you need to remove the aluminum timing chain cover. That cover also holds the oil pump and fuel pump. You'll need to remove both. The oil pump so you can pack it with Vaseline, which is required so it will prime. The fuel pump so that during reassembly the pump lever can be properly seated on the "cam" surface that it runs on. So I'd suggest having gaskets on hand for both of those.

    I agree with djbutler on the oil pan. Change the entire gasket. It's very hard to not get some coolant into the oil pan when you pull the cover. It's cheap insurance to pull the pan and make sure it's clean and dry.
     
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