Lifters

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Solid lifters will have a distinctive "ticking" sound at idle caused by the clearance between the tip of the rocker arms and the valves.
 
Solid lifters will have a distinctive "ticking" sound at idle caused by the clearance between the tip of the rocker arms and the valves.
  
If you adjust the rocker arm and lifter to "zero lash" using a valve whose lifter is on the heel of the camshaft lobe, if you then adjust the rocker arm nut down further than zero lash, a hydraulic lifter will compress and allow this to happen. If it's a solid lifter, you will be compressing the valve spring and you will feel considerable resistance to turning the adjustment nut down further. A hydraulic (in most cases) should allow at least a full turn of the adjustment nut, if not two or more turns before the valve spring starts to compress. If the engine has just been running, there will be resistance caused by the hydraulic lifter being pumped full of oil, but after waiting after turning down the adjustment nut, a hydraulic lifter will "bleed out", allowing the lifter to compress. A solid lifter won't do this, and the valve spring will remain compressed.
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If you adjust the rocker arm and lifter to "zero lash" using a valve whose lifter is on the heel of the camshaft lobe, and you then adjust the rocker arm nut down further than zero lash, a hydraulic lifter will compress and allow this to happen. If it's a solid lifter, you will be compressing the valve spring and you will feel considerable resistance to turning the adjustment nut down further. A hydraulic (in most cases) should allow at least a full turn of the adjustment nut, if not two or more turns before the valve spring starts to compress. If the engine has just been running, there will be resistance caused by the hydraulic lifter being pumped full of oil, but after waiting after turning down the adjustment nut, a hydraulic lifter will "bleed down". A solid lifter won't do this, and the valve spring will remain compressed.
  
If you find that you have solid lifters but don't know what lash to adjust them to, you can use 0.020" to 0.025" clearance on both intake and exhaust as a starting point.
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===How to adjust a solid lifter===
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;See [[Adjusting solid lifters]].
  
 
==Break in of flat tappets==
 
==Break in of flat tappets==

Revision as of 19:42, 10 January 2013

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