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Not hydraulic? read and decide
Posted by Jonathan Bartlett (more from Jonathan Bartlett) on Sat, 15 Nov 2003 08:27:09
In Reply to: Never seen hyd. lifters in a V4! n/m, BobD, Fri, 14 Nov 2003 10:21:47
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The lifters in my 1500 Sonett contain an "insert" retained by a circlip. The center of the insert, directly under the ball end of the pushrod, has a drilled hole that passes through the insert. The insert has a small amount of travel between bottoming in its pocket in the lifter body and the snap ring circlip retainer.
It appears that oil gets through the insert bore hole and under the insert during most of the time when there is free play or lash only to have this insert bore sealed by the pushrod when the cam lobe comes around. The pushrod itself acts as a one way valve to allow oil into the insert bore.
This theory of oil being allowed under the insert when there is free play, and preventing oil from being expelled when the pushrod exerts a compression load would tend to keep the space under the insert full and the insert pressed against the pushrod. Once free play or lash is removed by an increasing oil column under the insert, no more oil can get in. Once inherent leakage around the insert clearance in the lifter body lets the oil column drop, the clearance between the pushrod ball end and the insert bore lets more back in. This sure appears to me to be a hydraulic compensation for lash.
The lifters in the 1700 engine I've dismantled are one piece, no insert, no circlip, no center bore. A traditional, solid, lifter.
So, Is this insert style lifter a hydraulic lash compensating device and how should the base valve to rocker adjustment be made?
Cold with engine stopped and inserts "sunken" into their lifters?
Warm and with the engine running, inserts pumped up?
posted by 64.12.96...
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