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Old 09-13-2008, 08:07 PM
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Hydraulic roller lifters

I need some help regarding hyd roller lifters. My question is "once I set my valve lash, should the lifter loose its load"? In other words, when the valve is set correctly the I wait about five minutes, now my pushrod for the valve I just set and the rocker arm are now loose to the point where the pushrod will spin with my fingers and the rocker arm can be "jiggled" side to side. Can someone please help me clarifiy if I have a problem or is this normal?

Thanks in advance.

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Old 09-13-2008, 08:11 PM
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Normal situation. As long as the lifter doesn't bleed down to where there is actual measurable lash.
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Old 09-13-2008, 08:13 PM
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Both Comp and Crane now suggest setting the preload with the lifters empty of oil. When the lifter is on the low side of the cam, 1/2 turn is about .020 thousands of compression on the lifter plunger. If, after sitting for 5 minutes, it gets looser, I suspect either the lifter is full of oil and then bleeding down a tad, or ??????

Mark
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Old 09-13-2008, 11:55 PM
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Yep, what they said. ^^

For a 7/16" rocker stud, a half-turn yields .030" preload. A 3/8" stud will need closer to 3/4 turn to yield .030.

.030 being the spec of my Comp hyd. lifter 885-16.

Hope this helps.
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Old 09-14-2008, 08:20 AM
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So if the lifter does bleed down to where there is "lash" present, does that mean the lifter is bad? These are used lifter/cam combonation that I purchased from a cousin of a friend so I'm not certain they are in good shape. Is it possible that there is a problem with the rocker arm? Some had clearance issues with the head studs and had to be filed down a small amount. Is that common?

Thanks,
Brian
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Old 09-14-2008, 08:27 AM
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Clearencing rockers is common in some applications.

Lifters that are bleeding down is not really a good sign, but not a deal killer either, depending on what you are going to do with the engine/car. For a budget driver, it may be ok.
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Old 09-14-2008, 10:10 AM
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Not a daily driver, trying to make a streetable bracket car. When I say streetable I mean something I can drive to the track only 15 miles away. Thanks for the help.
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