Cam walk

Discussion in 'Tri Shield Performance' started by 462 GILLEY, Nov 27, 2012.

  1. 462 GILLEY

    462 GILLEY Well-Known Member

    Hi Jim

    I just read that you completed a engine build for a member, he said that you installed a torrington bearing to take care of cam walk. I have 2 questions about this.

    1. What is the cause of cam walk, and are torrington bearings just a bandaid fix?
    2. Were did you come up with the torington bearing?

    Thanks
    Mike Gilbert
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Mike,
    Generally, that isn't a problem except for roller cams. In the case of roller cams, a cam bumper kit is used. Are you sure you aren't thinking of damage to the front of the block. That's the only time i remember seeing a torrington bearing used, not for cam walk, but to repair the block. Maybe this thread is relevant? http://www.v8buick.com/showthread.p...for-scored-block&highlight=torrington+bearing
     

    Attached Files:

  3. 462 GILLEY

    462 GILLEY Well-Known Member

    Hi Larry

    I got a brand new Comp Cam, a hydrolic lifter cam. After running it for maybe 100 miles I blew off the remote oil filter adapter and pulled the motor. When we got to looking at in at the machine shop we noticed the cam was walking BACK into the block and cutting into the block.

    I have not had the chance to check the distributor gear for ware yet.

    Thanks
    Mike
     
  4. DaWildcat

    DaWildcat Platinum Level Contributor

    I think you just identified the root cause of the problem. Excessive cold oil pressure causes huge resistance in distributor rotation, and the force is screwing the camshaft gear rearwards forcing the cam into the front of the block. Are you running a high volume oil pump? What viscosity?

    Devon
     
  5. 462 GILLEY

    462 GILLEY Well-Known Member

    The oil pump is NOT a high volume pump, but I run the metal spacer plate, and I am running straight 20 weight Brad Penn oil.

    Mike
     
  6. DaWildcat

    DaWildcat Platinum Level Contributor

    Sounds fine so far. What were the pressures, cold and hot? Seems like the two symptoms you mentioned are screaming for oil pump attention for one reason or another.

    Devon
     
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    If you blew the oil filter or pump cover, I'd say your pressure is excessive. That can happen if the pressure relief valve gets stuck. I'd also pull the cam and look at your front cam bearing.
     
  8. Jim Weise

    Jim Weise GOT AIR?

    Hi Mike,

    Sorry I was not able to see this when you posted it, and it was good to talk to you on the phone last week. I hope it helps you in the correct direction.

    Here are some pictures that might help out..

    After surfacing the damage area.

    [​IMG]

    And a pair of .030 torrington bearing races for spacers.

    [​IMG]

    JW
     
  9. 462 GILLEY

    462 GILLEY Well-Known Member

    Hi Jim

    Thanks for the pictures, it was good to talk to you last week, and this makes it all clear. How did you cut the block? Did the cam bearings need to be cut?

    Have a great Holiday season.
     
  10. Jim Weise

    Jim Weise GOT AIR?

    Mike,

    cut in a Bridgeport.. hanging the block off the side was a trip, according to Ron..

    No, no requirement to cut the front cam bearing, it's installed in the correct position in that picture.

    Jw
     
  11. gmcgruther

    gmcgruther Well-Known Member

    cam walk is consider in Ed Iskenderian and Comcams and many other cam makers is lifter bore misalignment and possible cam bore misalignment. https://www.iskycams.com/camwalk.php
     
  12. HotRodRivi

    HotRodRivi Tomahawks sighted overseas

    Nice good info. something to check before im done building my motor .
     
  13. Buickstaged

    Buickstaged The stable - 2204 Combined HP

    Jim - the face of that block looks familiar.... Looks like the weather might break in a few more days for you. I still stand by my comments that I'm not coming back until I have to mow my yard.... My neighbor sent us pics of our yard, house and driveway - it looks just awful. I will make a road trip and bring back your fuel gauge when we get home. best
    regards Byron
     
  14. Jim Weise

    Jim Weise GOT AIR?

    Hey Byron-- Hope AZ is treating you well...

    You missed a bad on this year, and it's snowing like crazy again today.. we have 6" already and still coming down-- cities missed most of it, started about your house and north.

    See you when you get back.

    JW
     
  15. HotRodRivi

    HotRodRivi Tomahawks sighted overseas

    That pic of your hand on the block holding the thrust washer in place reminds me of the Hayden trans manuals with all the drawn in hands pointing or holding various parts for a rebuild. I had a come back and i blamed it on the book not having pics of any hands in it. I was the only one who thought it was funny though.
     

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