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Are valve cover bolts “torque to yield”?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Cornflake, Dec 11, 2018.

  1. Dec 12, 2018 at 9:34 AM
    #21
    Cornflake

    Cornflake [OP] 95.5 Tacoma 2.7 4x4

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  2. Dec 12, 2018 at 9:42 AM
    #22
    DrZ

    DrZ Well-Known Member

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    No need to replace or remove the half moons unless they are leaking. But make sure you use sealant at the points where it's called for, usually along the top of the half moons. And clean the surface real good with brake cleaner on a clean towel before applying sealant.

    You can also replace the pvc valve grommet while you have the cover off. It can be brittle and fall inward, so it's easier to do when you have the cover off.

    Spark plug tube seals also. A kit might include all of these rubber parts and the rubber seals for under the bolts.
     
    cruiserguy and Clearwater Bill like this.
  3. Dec 12, 2018 at 9:44 AM
    #23
    cruxofthebisquit

    cruxofthebisquit Well-Known Member

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    Does the 4 cyl. engine utilize them?
    If so, it's really just a matter of re sealing your existing ones as a new one comes with no sealant in place. They're Aluminum, they don't wear. BE SURE yo reseal though as this is a common leak point.
     
  4. Dec 12, 2018 at 9:48 AM
    #24
    cruxofthebisquit

    cruxofthebisquit Well-Known Member

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    I disagree with this completely but the reality is that it's a simple enough job that you can re do when the seal goes and it too leaks. Do it or not for your own research. I certainly used to take a more "If it ain't broke" attitude and still can if complicated to go ahead. This is not.

    BTW: The rest of the info. is great.
     
  5. Dec 12, 2018 at 9:57 AM
    #25
    DrZ

    DrZ Well-Known Member

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    You're probably right. Just pull the half moons, clean the surfaces well and put new sealant on. I guess most people use something like Permatex Ultra Black or is there something better?
     
  6. Dec 12, 2018 at 11:56 AM
    #26
    Cornflake

    Cornflake [OP] 95.5 Tacoma 2.7 4x4

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    Should I use any sealent around the gasket when replacing it? Like a silicone or anything to that effect? Or just put the gasket straight on?
     
  7. Dec 12, 2018 at 12:56 PM
    #27
    DrZ

    DrZ Well-Known Member

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    I'm getting a little confused thinking about different engines. Engines with a timing belt usually have a semi-circular bearing the sticks up and there is a corner to the valve cover gasket. On these types of engines Toyota specifies putting sealant where this corner is. I don't think these 4-cylinder engines have this. They are flat all around the valve cover.

    Toyota will usually specify putting sealant on top of the flat part of the half moons where the valve cover gasket sits because there might be a small gap/crack between the cylinder head and half moon. For some reason Toyota doesn't specify it in the 1996 rapair manual.

    So, you just need the sealant on the circular part of the half moons where it contacts the cylinder head and it doesn't hurt to put it on the flat part of the half moon when you install the valve cover.

    You don't need sealant all the way around. The bare metal and gasket should form a good seal, and putting sealant all the way around will just make it harder to clean if you ever need to remove the cover again.
     
    Cornflake [OP] likes this.
  8. Dec 12, 2018 at 5:27 PM
    #28
    Mr2cent

    Mr2cent Active Member

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    The bolts themselves are NOT torque to yield, they are indeed reusable. The grommets though, Toyota says they are not reusable. If they are all still present, and in good shape, go ahead and reuse them!
     
    Cornflake [OP] likes this.
  9. Dec 12, 2018 at 5:29 PM
    #29
    Mr2cent

    Mr2cent Active Member

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    My bad, it's a 2.7! No grommets! Disregard haha
     
    Cornflake [OP] likes this.

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