All hyd. lifters should not be pumped up before assembly!!!!! Mouse is on the target with that statement
It will damage the engine or destroy the lifters!!!!! Putting them in a bucket of oil onle lubes the outer surfaces and makes a big mess LOL! Anyone that gets new lifters ask for the teck sheet almost all company's say do not fill lifters with oil prior to -------!!! A well trained mechanic knows this and some company's in their tech sheets don't mention it because they take for granted your assembler is well trained!!!!
MouseFink: I'm only backing what you already stated!!! Before some one untrained comes in and says your wrong
Heres an example of a tech. sheet mentioning lifter prep!!!
1. Lifter Preparation: Remove your new COMP Cams® lifters from the packaging, and clean
the lifters thoroughly in mineral spirits or an equivalent solvent. Remember, in order to protect
your camshaft warranty new COMP Cams® lifters
3406 Democrat Rd.
Memphis, TN 38118
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COMP Cams - Performance Camshafts, Lifters, Valve Springs, Rocker Arms
It is not necessary to “pre-pump” hydraulic lifters full of engine oil prior to installation and valve adjustment. It is actually undesirable to do so as the “pumped up” lifters will cause the valves to open during the adjustment process, rather than positioning the lifter plunger in its operating position as it is supposed to do.
“Pre-soaking” hydraulic lifters in a bath of engine oil is a good idea but not mandatory. Doing so ensures that the lifters are adequately lubricated on their outer surfaces prior to installation. It may also result in a quieter engine start up as the oil in the bath may displace some air from the lifter’s plunger reservoir.
Coat the bottoms of all flat tappet lifters with COMP Cams® Cam and Lifter Installation Lube (Part #103) supplied with flat tappet cams. When you install the lifters, make sure they fit well. Flat tappet lifters should rotate freely in the lifter bores. Any excess clearance or tight lifters can cause damage to the camshaft, leading to engine failure. Note: Contact your engine builder ETC,ETC,------------------------------------------------------------------------