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Valve cover replacement suggestions

Discussion in 'XJ Technical Chat' started by kmalcom, Dec 12, 2007.

  1. kmalcom

    kmalcom New Member

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    I have purchased a valve cover gasket for my '82 750. The guy at the shop suggested to replace the bolt gaskets also. Is there any need for this ? I have not opened the engine yet to see what he is talking about, just getting info. in advance.
     
    kmalcom, Dec 12, 2007
    #1
  2. MiCarl

    MiCarl Active Member

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    The 8 outboard bolts don't tighten against the cover, they have a shoulder on them that contacts the head. Up by the head of the bolt there is a rubber piece, as this compresses it holds the cover down tight. Essentially it acts like a seal and a spring.

    With age those pieces loose their elasticity which can prevent them from holding the cover tight enough.
     
    MiCarl, Dec 12, 2007
    #2
  3. ArizonaSteve

    ArizonaSteve Member

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    You can get the bolt gaskets on ebay. If yours are dry and cracked you will need to replace them like MiCarl says. If they aren't tight enough to prevent leaking you may be able to get a few more years out of them by putting a washer on the bolt underneath the head to provide some more compression. I used some C clips to do that temporarily but eventually they will have to be replaced. Don't tighten down the bolts too much or you will strip the threads in the head. When the collar on the bolt hits bottom you are done tightening.
     
    ArizonaSteve, Dec 13, 2007
    #3
  4. kmalcom

    kmalcom New Member

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    Cool, sounds like I will wait till it is apart and go from there.. thanks to all..
     
    kmalcom, Dec 13, 2007
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  5. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    I also carry these in stock. There are rubber washers for both the 8 outer bolts and different one for the 4 inner bolts:

    http://www.xjbikes.com/Forums/viewtopic ... t=135.html


    Valve Cover Bolts and Rubber Sealing Washers:


    HCP1621 reproduction valve cover hold-down bolt Rubber Sealing Washer, used on all XJ550 models, 1982-84 XJ650 Maxim models, all XJ700 non-X models, and all XJ750 models. These washers are for the 4 INNER bolts. Each
    $ 2.50

    HCP1621SET4 reproduction valve cover hold-down bolt Rubber Sealing Washers, set of 4:
    $ 8.50


    HCP1622 reproduction valve cover hold-down bolt Rubber Sealing Washer, used on all XJ550 models, 1982-84 XJ650 Maxim models, all XJ700 non-X models, and all XJ750 models. These washers are for the 8 OUTER bolts. Each
    $ 2.00

    HCP1622SET8 reproduction valve cover hold-down bolt Rubber Sealing Washers, set of 8:
    $ 12.50
     
    chacal, Dec 13, 2007
    #5

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