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Thread: Cam walk

  1. #1
    Join Date
    Feb 2002
    Location
    Oberlin, Oh.
    Posts
    301

    Default Cam walk

    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. #2
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    27,213

    Default Re: Cam walk

    Quote Originally Posted by 462 GILLEY View Post
    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
    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.ph...ington+bearing
    Attached Images Attached Images
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    THM400 with Ultimate 258mm converter, Gear Vendors OD
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's Race weight 4025lbs.
    Best E.T. 11.54 Best MPH, 116.06
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  3. #3
    Join Date
    Feb 2002
    Location
    Oberlin, Oh.
    Posts
    301

    Default Re: Cam walk

    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. #4
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    15,231

    Default Re: Cam walk

    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
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  5. #5
    Join Date
    Feb 2002
    Location
    Oberlin, Oh.
    Posts
    301

    Default Re: Cam walk

    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. #6
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    15,231

    Default Re: Cam walk

    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
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  7. #7
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    27,213

    Default Re: Cam walk

    Quote Originally Posted by 462 GILLEY View Post
    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
    Quote Originally Posted by 462 GILLEY View Post
    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
    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.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    THM400 with Ultimate 258mm converter, Gear Vendors OD
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's Race weight 4025lbs.
    Best E.T. 11.54 Best MPH, 116.06
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  8. #8
    Join Date
    Feb 2002
    Location
    Pine City, MN
    Posts
    9,613

    Default Re: Cam walk

    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.



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



    JW
    Owner/operator

    Tri-Shield Performance
    Jim Weise
    Founder/Owner
    V-8 Buick.com
    320-629-8999

    Most folks are about as happy as they make up their minds to be.
    Abraham Lincoln
    16th president of US (1809 - 1865)

  9. #9
    Join Date
    Feb 2002
    Location
    Oberlin, Oh.
    Posts
    301

    Default Re: Cam walk

    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. #10
    Join Date
    Feb 2002
    Location
    Pine City, MN
    Posts
    9,613

    Default Re: Cam walk

    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
    Owner/operator

    Tri-Shield Performance
    Jim Weise
    Founder/Owner
    V-8 Buick.com
    320-629-8999

    Most folks are about as happy as they make up their minds to be.
    Abraham Lincoln
    16th president of US (1809 - 1865)

  11. #11
    Join Date
    Dec 2013
    Location
    Sacramento, CA
    Posts
    992

    Default Re: Cam walk

    Nice good info. something to check before im done building my motor .
    Anson Favalessa

    Sliding down the Razor Blade of Life.

    Reading that kinda gives you that fingernails on the chalkboard feeling.

  12. #12
    Join Date
    Jul 2010
    Location
    Chisago City, MN -
    Posts
    198

    Default Re: Cam walk

    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
    If you were to ask me if I'd ever had the bad luck to miss my daily coctail, I'd have to say that I doubt it, Where certain things are concerned, I plan ahead. Author; Luis Bunuel

  13. #13
    Join Date
    Feb 2002
    Location
    Pine City, MN
    Posts
    9,613

    Default Re: Cam walk

    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
    Owner/operator

    Tri-Shield Performance
    Jim Weise
    Founder/Owner
    V-8 Buick.com
    320-629-8999

    Most folks are about as happy as they make up their minds to be.
    Abraham Lincoln
    16th president of US (1809 - 1865)

  14. #14
    Join Date
    Dec 2013
    Location
    Sacramento, CA
    Posts
    992

    Default Re: Cam walk

    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.
    Anson Favalessa

    Sliding down the Razor Blade of Life.

    Reading that kinda gives you that fingernails on the chalkboard feeling.

 

 

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