Discovery 2: Build and assembly of 4.6L V8 - Page 6





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  1. #101
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    Default Re: Build and assembly of 4.6L V8

    Quote Originally Posted by jfh View Post
    I use Locktite silicone
    Reinzosil for me.
    https://www.reinz-industrial.com/EN/...REINZOSIL.aspx
    Cheers,
    John Kilfoil

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  2. #102
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    Default Re: Build and assembly of 4.6L V8

    Where I do hate silicone is on sumps without gaskets.

    Just a crappy idea.
    Last edited by jfh; 2020/01/01 at 07:45 PM. Reason: sorry OT
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  3. #103
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    Default Re: Build and assembly of 4.6L V8

    Quote Originally Posted by grips View Post
    Your engine looks Awesome.

    On silicone I hate it. Once rebuild a Ford 3.0l Essex V6. Opening it up I found it dropped a main bearing. Piece of silicone stuck in the oil port.
    that is because ppl go over board with the stuff, it just needs a very small amount as long as faces are clean smooth
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  4. #104
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    Default Re: Build and assembly of 4.6L V8

    Quote Originally Posted by clivemd View Post
    that is because ppl go over board with the stuff, it just needs a very small amount as long as faces are clean smooth
    Exactly, what is so beautifully referred to in Afrikaans as a "katspoeggie"...
    Cheers,
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  5. #105
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    Default Re: Build and assembly of 4.6L V8

    Still up to my eye balls in elbow grease cleaning parts that i dont want to just throw back on and bolt up.
    Slow process getting into the small nook sand crannies and scraping gasket maker off and out of everything.

    Have fitted the heads and torqued them up, definitely seems to go nice and easy with the studs rather than the 90 plus 90 on the standard bolts.

    Went 33Nm - 67Nm - 94Nm on the studs.

    Also fitted the timing chain, marks on the gears line up perfectly with piston 1 at TDC.

    And a little sneak peak of what the end result is heading towards after my wife decided she also wants to be involved and is handling the cosmetic side of the build.

    Rockers is next on the list, meeting with someone on monday to see what we can do at machining the shafts and fitting bronze bushes to the arms and pedestals.

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  6. #106
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    Default Re: Build and assembly of 4.6L V8

    I also did mine in green, if remember correctly it was "Jonh Deere green"
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  7. #107
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    Default Re: Build and assembly of 4.6L V8

    Well done! Looks good!

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  8. #108
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    Default Re: Build and assembly of 4.6L V8

    Looking good, have you checked the rocker shafts? Are they usable?
    Alan


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  9. #109
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    Default Re: Build and assembly of 4.6L V8

    Visited some awesome people today who are helping me with some really exciting new things, can not wait to see the final outcome (sorry to tease and keep you waiting)

    I did rebuild one of the rocker shafts, orientation is now correct and will get new split pins tomorrow before starting with the tedious but vital task of checking valve clearances.

    Click image for larger version. 

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  10. #110
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    Default Re: Build and assembly of 4.6L V8

    Quote Originally Posted by All -in -one View Post
    Looking good, have you checked the rocker shafts? Are they usable?
    Hi Alan, unfortunately not.
    Once I had disassembled them and cleaned them the wearing on the shafts was not too great.

    Will stop by to give them back to you.

  11. #111
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    Default Re: Build and assembly of 4.6L V8

    Quote Originally Posted by Jay_B View Post
    I did rebuild one of the rocker shafts, orientation is now correct and will get new split pins tomorrow before starting with the tedious but vital task of checking valve clearances.
    Not sure if you can, the system is self adjusting because of the hydraulic lifters.
    What you can check is if it's necessary to shim the rocker shafts.

    Unless I'm missing something.
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    The only thing needed for evil to triumph is for a good man to do nothing.

  12. #112
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    Default Re: Build and assembly of 4.6L V8

    Quote Originally Posted by jfh View Post
    Not sure if you can, the system is self adjusting because of the hydraulic lifters.
    What you can check is if it's necessary to shim the rocker shafts.

    Unless I'm missing something.
    No you are correct and that is what I am referring to (my terminology maybe out)

    1) Check clearance in the lifters
    2) Shim rockers if required

    Holding thumbs that no shimming will be needed.

  13. #113
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    Default Re: Build and assembly of 4.6L V8

    That RPI website shows you a very nice technique.
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  14. #114
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    Default Re: Build and assembly of 4.6L V8

    right so I am properly puzzled here and could use some input from those who have been through the process of checking valve pre-load.

    I have used 3 different methods among which includes the ones from V8Developments and RPI Websites. Once I do the maths using the 1.6 ratio for the rocker arms I calculate I will need around a 20mm shim under the pedestals to get within spec.

    You can see in the picture below that the gap between the bucket and clip is massive and that is with the cam at 180deg.

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    Some more assembly pictures, really looking so good and the excitement is building to get her finished, just need to figure out what is up with these pre-loads.
    Will play around with some washers later this morning to see what I can find before having shims cut.

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  15. #115
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    Default Re: Build and assembly of 4.6L V8

    From the RPI website:

    But beware, the rocker ratio is 1.6 that of the clearance that needs correcting, so a 16 thou. shim will make approx 25 thou. difference.


    I think you did the math the wrong way round.
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  16. #116
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    Default Re: Build and assembly of 4.6L V8

    And also from the website:

    Each one needs checking individually with the cam ideally 108 deg. off its lobe.

    Don't take the reading when the lifter is on top of the lobe.
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  17. #117
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    Default Re: Build and assembly of 4.6L V8

    Quote Originally Posted by jfh View Post
    From the RPI website:

    But beware, the rocker ratio is 1.6 that of the clearance that needs correcting, so a 16 thou. shim will make approx 25 thou. difference.


    I think you did the math the wrong way round.
    I have double checked all of that over and over, the gap I am getting is approx 1.3" thats a looooong way from the ideal spec of approx 0.03"

    maths looks like this:

    PL gap measured = 0.14"
    Decrease needed = 0.14" - 0.03" = 0.11" (looking for spec around 30thou or 0.03")

    70 thou shim x 1.6 ratio = 112 thou decrease (or +- 0.112")

    Thus and 70thou shim will give PL' = 0.11" - 0.112" = 0.028" (or 28 thou) which is within spec

    So a 70 thou shim or +- 1.7mm

    Let me know if I am correct or getting it wrong somewhere please.

    * edit updated with correct measured values
    Last edited by Jay_B; 2020/01/08 at 12:04 PM.

  18. #118
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    Default Re: Build and assembly of 4.6L V8

    Is your average gap 1.3mm?

    Then 1.3÷1.6=0.8125mm

    That's how I see it.
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  19. #119
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    Default Re: Build and assembly of 4.6L V8

    Sorry I forgot about this part:

    You MUST find an average shim size, and fix it to EVERY rocker. So, for example, if you find that you have 4 tappets at 70 thou. and 4 at 80 thou. you would put 32 thou. shims on all the pre-load of the tappets, making the 70 thou. tappets 25 thou. and the 80 thou. 35, thus all the tappets are within, or closest possible to, the allowed tolerance.

    So 0.8125-0.762=0.0505mm

    The 0.762= 0.03 of an inch.
    Last edited by jfh; 2020/01/08 at 11:13 AM.
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    '84 Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work.
    The only thing needed for evil to triumph is for a good man to do nothing.

  20. #120
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    Default Re: Build and assembly of 4.6L V8

    Quote Originally Posted by Jay_B View Post
    Let me know if I am correct or getting it wrong somewhere please.
    I sent you a PM.
    Best regards
    Philip
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