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17122490 LS7 Lifters Set of 16 GM Original Equipment Engine Hydraulic Valve Regulator Fit LS1 LS2 LS3 LS6 LS7 LQ4 LQ9 LY5 LY6 LM7 4.8 5.3 5.7 6.0 5233745 5234670 JB2079 HL123 JB2270 HL112

Function: Hydraulic adjustment replaces the adjustment screw and lock nut. The hydraulic tappet is always in contact with the camshaft, runs without clearance, maintains a reasonable valve volume, and reduces the impact and noise between parts
Fits:LS1, LS2, LS3, LS6, LS7 Engines,V8 Engine Sizes 4.8L, 5.0L,5.3L, 5.7L, 6.0L,V6 Engine Sizes 3.3L,3.8,4.3L
Applicable to: April 2007 Express 3500, 1999-2006 2013 Silver 1500, 2007 Silver 1500 Classic, 2000 Silverado 2500, 2003-2005 Silver 2500 HD, 2000-2006 2008 Tahoe, 2002-2006 Avalanche 1500 ,1988-1990 1994 1998-2005LeSabre, 1998-2004 Park Avenue, 1993 Riviera, 2000-2004 2006 GMC Yukon XL 1500, 2003 2007 GMC Savannah 1500, 2003 2004 2007 GMC Savannah 2500, 2004 2007 GMC Savannah 3500, 1999- 2006 GMC Sierra 1500, 2007 GMC Sierra 1500 Classic
OE:17122490, 17089852, 17108057, 17120070, 17121905,HL124, 10530-16, 91113, HT-2148, 12595365, 5234890, 5235498, 5233745, 5234670,JB2079, HL123,JB2270,HL112 ,HL118,HL119, L2148
Choose the thickness of the tappet: measure the measured value of the gap, the reasonable gap of the valve is 0.20MM and the exhaust pipe gap is 0.30MM, and then the thickness of the exhaust tappet can be calculated

Mechanical elevator and hydraulic elevator are compared

1 It's quieter.
2 low maintenance.
3 can adjust the thermal expansion of the engine.
4 as a built-in shock absorber can reduce pressure
On the valve train.
5 be able to design a "bleeding rate"
In order to adapt to different engine speed range.

Why choose hydraulic lift

Maintenance and low cost are the first consideration.

Mechanical cam design requires running clearance or

Valve clearance, while hydraulic tappet is the opposite.

When the rocker arm assembly is properly tightened

When positioning, the push rod must occupy all the clearance

Falling into the hydraulic lifter, resulting in the push rod

In most cases, the seat can be moved down 0.020 inch to 0.060 inch

Adjust the preload

LS series as V8 engine

When closing the clearance between piston and valve, the preload should be

Step by step, 1 / 4 turn at a time, allowing the lift

Bleed between adjustments. This can be avoided

The valve may be bent.

The hydraulic tappet elevator must be checked frequently

Many things will affect the lift, after the cam, hydraulic tappet and push rod are in place, install

For your rocker arm assembly, tighten all valve train bolts

In the right order. Choose a cylinder you want to go to

Check it out. Turn the engine in the normal direction by hand

Rotate until both valves are closed. you are here

Compression cycle of the cylinder. (in this position, the valve

The spring is at least the minimum pressure they have to do the job

It's a little easier.) Wait a few minutes for the lift Bleeding

Why the correct viscosity and proper glue breaking

Important matters of hydraulic roller cam running-in:

1 Many noisy lift complaints

Actually, the wrong viscosity was used. Thicker, taller

Viscosity oil (such as 20W-50) will not have enough oil to flow into the tappet

Too little viscosity, such as 5W-30, will make the elevator

It is easy to "bleed". But there is a common misunderstanding

The results show that high-performance engines require 20W-50, and the results show 10W-40

Provide the correct viscosity for the hydraulic tappet.

2 The best protection for hydraulic roller lifts is to use a complete formula

Run-in oil. Another reason is that the elevators are noisy and poor

Appears as debris caught by the elevator. The number of door breaks has increased tenfold

Particles will be generated during the running-in process, most of which will disappear

Via the lift. Proper oil running-in will not severely wear parts, resulting in

Excess crumbs. Change the oil and filter after running-in

Get wear particles out of the engine within 500 miles

They can cause lasting damage.

3 These same recommendations apply to ramjet engines

Steel swing arm. High friction at the pivot point

A lot of heat, so proper lubrication is essential for their running-in.