hydraulic lifters. - Team Camaro Tech
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post #1 of 4 (permalink) Old May 5th, 04, 05:00 PM Thread Starter
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Join Date: Dec 2003
Location: Eastern Canada
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Good Day. A friend just fired up his fresh engine with a hydraulic camshaft. He was planning on re ajusting the lash after the cam has been broken in. Is it necessary to recheck this? I was to the opinion that when building the engine, you adjust the the rocker nut so there is no clearance between the lifter and push rod. A additional 1/2 - 3/4 turn of the rocker nut would put the lifter plunger in the middle of its travel. I can not see how running the engine would change anything. He tells me the oil will pump up the lifter. I thought the oil was a cushion and would self adjust to any wear that occures after time. If re adjusting is necessary, does G.M. do this to all their new cars or engines? Personally, I don't think so. Anyone care to clear this up?
Thanks in advance.
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post #2 of 4 (permalink) Old May 5th, 04, 06:18 PM
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On our performance engines we build with hydraulic lifters we adjust them on the engine stand and never touch them till it comes in for a refresh.
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post #3 of 4 (permalink) Old May 6th, 04, 06:31 PM
Join Date: Jan 2004
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I second that, Carl. If hyd. lifters are properly adjusted when the engine is assembled, and nothing stupid like a rocker nut failure happens, you should not have to touch them. There are lots of engines that don't even have an adjustable valvetrain.
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post #4 of 4 (permalink) Old May 9th, 04, 01:04 PM
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The Viper valvetrain is non-adjustable; when we build them, the roller rocker fulcrum stands just bolt down solid to the machined pedestals on the heads after we drop the pushrods in. We use Rhoads variable-duration roller lifters in every Viper engine, and the rockers are investment-cast stainless steel alloy.


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