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Re: What's a valve absorber?[200/1993] posted by abe crombie on
Saturday, 24 October 1998, at 12:27 p.m.
Underneath the bucket tappet that holds the valve adjuster shims is a suction cup with a hole in the middle shaped rubber piece that fits over each valve stem to make sure that the bucket stays in palce on top of the valve and the shim on top of bucket takes any imapct when cam lobe comes around. If this piece fails it will give a pecking noise when there is in fact proper valve clearance when it is checked. If they found proper clearance yet you had a tapping noise then they replaced these to fix problematic noise.
If this is failed the oil film on cam lobe keeps the bucket in contact with cam lobe until lobe rotates around to a certain point and then it slams the bucket down onto valve head making the noise and if left unchecked it will mushroom head of valve.