348 engine out major | Page 18 | FerrariChat

348 engine out major

Discussion in 'Technical Q&A' started by ernie, Feb 22, 2014.

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  1. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Then I drilled a hole at one end of the wood so I could screw the dial indicator to it. I know this isn't the absolute most accurate way of doing this, but like I said, I used what I had laying around.

    Oh you'll also notice that the cams are already installed. I forgot to take a pic of how I positioned the dial indicator when I found TDC with the cams of. So I mocked it up and snapped a pic.
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    Last edited by a moderator: Sep 7, 2017
    ernie, Mar 2, 2014
    #426
  2. yelcab

    yelcab F1 World Champ Consultant

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    Oh man, this is the ingenuity of a hack mechanic. Rob Siegel has nothing on you Ernie.
     
    yelcab, Mar 2, 2014
    #427
    ernie likes this.
  3. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Last edited by a moderator: Sep 7, 2017
    ernie, Mar 2, 2014
    #428
  4. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    LOL!!!

    Tinfoil-hat-tech I tell ya.
     
    ernie, Mar 2, 2014
    #429
  5. vvassallo

    vvassallo F1 Veteran

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    Ernie, how did you account for the coastal warpage factor in the wood? That would be good for at least a few 100ths of a mm of error. :|
     
    vvassallo, Mar 2, 2014
    #430
  6. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    With everything in place I rotated the engine, clockwise, until I found TDC. Then I adjusted the wire pointer so that it was pointing right at 0º on the wheel.

    Sorry fellas I didn't take any how-to pics of this. You can find plenty of info on how to do this on the web. It really isn't all that hard.
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    Last edited by a moderator: Sep 7, 2017
    ernie, Mar 2, 2014
    #431
  7. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    By line of sight dead reckoning.

    HAHAHAHAHA!!! :p
     
    ernie, Mar 2, 2014
    #432
  8. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Now to install the cams.

    I put a dab of assembly lube on the shim buckets. Then installed the shims into the bucket. To make sure I put the correct shims in the correct buckets I refer to my notes on the valve adjustment chart. I measured each shim and place it accordingly to the valve.

    Just in case you forgot. The reason the shims were removed was because I shipped them of to WPC for their treatment process.
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    ernie, Mar 2, 2014
    #433
  9. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Then I went around all the shims again and applied a dab of assembly lube to the top of each shim/follower, and to each of the cam journals in the head.
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    Last edited by a moderator: Sep 7, 2017
    ernie, Mar 2, 2014
    #434
  10. gaw111

    gaw111 Formula Junior Owner Silver Subscribed

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    Hey Ernie, Can you explain the degree wheel a little? I'm sure it's explained out there in google land, but you have a way of explaining it so my simple mind understands better. :)
     
    gaw111, Mar 2, 2014
    #435
  11. gaw111

    gaw111 Formula Junior Owner Silver Subscribed

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    Ok, I'll do some searching. We posted at the same time.
     
    gaw111, Mar 2, 2014
    #436
  12. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Last edited by a moderator: Sep 7, 2017
    ernie, Mar 2, 2014
    #437
  13. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Sure.

    I'll explain what top dead center is first.

    As the crank pushes the piston up the cylinder, the piston will eventually stop moving up because the crank has reached the limit of it's travel. The piston will remain at the top of the stroke for a few degrees of crank rotation (on my engine I found that to be 2º of crank rotation). The reason the piston dwells at the top is because of the length of the connecting rod. As the crank rotates (clockwise) the rod has to move from one side of the cylinder to the other. The middle of the piston dwelling at the top is when the crank, and connecting rod are aligned 180º straight up and down in the middle of the cylinder.

    The dial indicator is used to see the movement of the piston. As the piston moves up, or down, the dial indicator will show that movement. That is why I put the socket extension into the spark plug hole, on the top of the piston. So as the piston push up on the extension, the extension move the dial indicator. So... when I rotate the engine I watch for the dial indicator to stop moving. The very moment it stops moving I note that position. That is what the wheel on the crank is for. So I can see where in the rotation the crank is. I then continue to rotate the crank and watch for the dial indicator to start going backwards, then note that position on the degree wheel on the crank. Then I split the difference, and adjust the pointer to the middle of both degrees. After I have positioned the pointer to the middle I adjust the degree wheel so that 0º is on the pointer. Then I go back and double check to make sure I have it correct. By doing this I can find 0º of the 360º of crank rotation, and I will be able to position the cams where they need to be.

    I hope that made a little sense?
     
    ernie, Mar 2, 2014
    #438
  14. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Okay back to installing these cams.

    I set the cam in the journals. If you look at the cam seal housing, in my right hand, you will see I have the mark in the housing pointing up.
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    ernie, Mar 2, 2014
    #439
  15. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Back when I removed the cam caps I talked about the numbers on the head being stamped right side up, or upside down, and the same on the caps.

    For this cam they were stamped up side down. So I match the cap to the number on the head, and put the cap on upside down, as it was stamped on the head. Again, the reason for this is because, that is the way the caps were positioned when they got bored at the factory. If they don't get installed facing the correct direction I would risk the cams seizing.

    So the caps get installed on the head with the numbers facing the same direction as on the head. And in this case upside down for my 1/4 intake cam.
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    ernie, Mar 2, 2014
    #440
  16. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    ernie, Mar 2, 2014
    #441
  17. fatbillybob

    fatbillybob Two Time F1 World Champ Consultant Owner

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    Did you WPC the cams?
     
    fatbillybob, Mar 2, 2014
    #442
  18. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Before I tighten them down I adjusted the cam timing mark to match the mark on the cap. I also had the mark on the cam seal housing pointing up too. The mark on the seal housing is opposite the oil drain notch on the other side of the housing. It's so that the excess oil can drain back into the head instead of pool up behind the cam seal.

    With the marks positioned correctly the cap nuts get tightened down. I like to start with the middle cam cap and work out.
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    ernie, Mar 2, 2014
    #443
  19. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Yes.

    Cams, followers, and caps.
     
    ernie, Mar 2, 2014
    #444
  20. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    ernie, Mar 2, 2014
    #445
  21. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    ernie, Mar 2, 2014
    #446
  22. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Last edited by a moderator: Sep 7, 2017
    ernie, Mar 2, 2014
    #447
  23. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Last edited by a moderator: Sep 7, 2017
    ernie, Mar 2, 2014
    #448
  24. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Last edited by a moderator: Sep 7, 2017
    ernie, Mar 2, 2014
    #449
  25. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    On to fitting the timing belt.

    Here is where I ran into a problem. I could not get the new belt to fit, even though I had the tensioner bearing compressed and locked in place. It just would not get over the last pulley. There wasn't enough slack in the belt, and I did not want to force it on for fear of damaging it.
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    ernie, Mar 2, 2014
    #450
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