COMP Cams 8959-16 Hydraulic Roller Lifters - Manual

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COMP Cams®
3406 Democrat Rd.
Memphis, TN 38118
Phone: 901.795.2400
Part #COMP4-140
Revised 3/22/12
Toll Free: 1.800.999.0853
www.compcams.com
Hydraulic Roller Lifters
Applicable Part #s: 850-16, 851-16, 853-16, 854-16, 857-16, 900-16, 8920-16, 8921-16, 8931-16,
8934-16, 8953-16, 8954-16, 8957-16, 8959-16
Thank you for choosing COMP Cams® products; we are proud to be your manufacturer of choice.
Please read this instruction sheet carefully before beginning installation, and also take a moment to
review the included limited warranty information.
The following instructions cover the correct procedures for installing COMP Cams® Hydraulic Roller
Lifters. The hydraulic roller lifters can be used with adjustable and non-adjustable valve train setups.
Through various testing we have discovered that the recommended lifter pre-load should be set 1 turn
of the wrench on the rocker arm adjusting nut past zero lash for optimal performance.
Setting Hydraulic Lifter Pre-load:
The correct amount of lifter pre-load is important to help efficiently control the valve train. Insufficient
pre-load will cause valve train noise, while too much may damage the hydraulics of the lifter or cause
low manifold vacuum. By following the four steps listed below you will help ensure proper engine
performance and reliability.
Instructions:
1. Lifter Preparation: Remove your new COMP Cams® lifters from the packaging, and clean
the lifters thoroughly in mineral spirits or an equivalent solvent. 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. When you install the lifters, make sure
they fit well. Any excess clearance or tight lifters can cause damage to the camshaft, leading to
engine failure. Note: Contact your engine builder or block manufacturer for your specific
clearances.
2. Setup: With your cam installed, simply place the prepped lifters into the lifter bores. If you are
using hydraulic rollers with a link bar, pay close attention to which direction the link bar faces.
The link bars on retro-fit lifters should face towards the valley of the block (except 8920-16,
link bars must face the cylinder side of the block instead of the valley). If the link bar has
an arrow on it, make sure the arrow is pointing upwards (↑). If your engine block was originally
equipped with hydraulic rollers make sure the lifter roller wheel is positioned to roll along the
camshaft lobe. Failure to do so will result in camshaft damage and improper oiling. Now that
the lifters are in place, you can begin to install the pushrods and rocker arms.
INSTRUCTIONS