Reply to "cam shaft lobe extensively worn"

4vandproudMember

Insufficient lobe taper = lifter did not rotate in it's bore

lifter & pushrod rotation is easily checked by turning the crank by hand and observing each one. mark them if you like, just a Sharpie line anywhere and they'll show evidence of rotation. if they don't, find out why. correcting the situation can be as simple as wiping the lifter bore clean, re-lubing and exercising the lifter up & down in the bore and you'll feel it free up & smooth out

and Yes to what George points out also, cam mfg'rs are skimping a little on lobe taper

synthetic oil is too slippery for flat tappet break-in, the 'tooth' of the lifter foot will not bite the cam lobe and the lifter will fail to rotate

2/26/184:29 PM

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