Camshaft question

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Cadillac Seville / Cadillac Eldorado Forum Discussion, Camshaft question in Past Cadillac Vehicle Discussion; Greets, What exactly would be considered the "thrust portion" of a camshaft? DJSG3...
  1. #1
    DJSG3 is offline Cadillac Owners Fanatic
    Automobile(s): '03 Deville DTS
    Join Date
    Dec 2005

    Camshaft question


    What exactly would be considered the "thrust portion" of a camshaft?


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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: Camshaft question

    "thrust portion" on a cam is a new one on me. Flat tappet cams are ground either with the lobes slightly tapered: about .001" to .0015", or with the lobes slightly offset in relation to the lifter center so the lobe action turns the lifter (or cam follower) each open-close cycle. This evenly distributes wear over the face of the lifter, and is why a properly operating lifter shows a polished circular pattern on its face. This action tends to "walk" the cam forward against the timing chain/belt and timing cover. Several manufacturers make thrust buttons for cam ends, or the engine manufacturer builds-in thrust bearings or buttons as original equipment. Thrust bearings are a shoulder on one or more cam bearings while buttons go in the cam end, bear against the timing cover itself and are lubricated by chain splash.

    So - the "thrust" portion of the cam would be the timing chain/gear/belt end of the cam. Obviously, roller cams are not ground as above because roller lifters or cam followers don't turn in their bores, so there's no tendency for the cam to "walk". In our case, 2000 and later Northstars have roller cams.

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