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There isn't one persay. The caps are torqued at around 45 inch pounds. If you have lifter noise, then you have to look at other things. Collapsed lifters, worn our push rods, Worn out rocker arms, worn out cam shafts. Lots to look at and measure.
Most engines now use hydraulic lifters and they can leak a little, this causes space between then lifter and the push rod. This results in a tapping noise that goes away when they get warm or fill back up.
Hi , usually a knocking / pinging from the valve cover indicates a lifter tapping. Could be worn out or just worn. Do you change your oil every 3000 with high quality oil? (I always have used valvoline standard with outstanding results) Dirty oil and filter and or incorect weight oil and or using synthetic oil in older cars can result in lifters tapping. If your oil is under 2000 miles since last change and you used a high quality oil (watch who changes your oil, some places use inferior oil because its cheaper) you can buy a pint of oil treatment formula to quiet noisy lifters to coat the lifter and quiet it down. It is a sign of engine wear, but one lifter tapping a bit wont really hurt your engine mechanically. If they all get noisy, time for a valve job. Root cause is wear due to insufficient lubrication. The lifters on newer cars are all hydraulic and they self adjust. No manual adjustment is possible. Bottom line: keep your oil changed regularly using a high quality non-synthetic oil for your 1999 vehicle.
Please rate this answer! Thanks, Mike
Dirt lodged in the check valve can allow the lifter to leak. Too much wear between the lifter and the body can cause excessive leak-down. This results in a noisy lifter.
A lifter might be noisy because of an oil pressure problem.
An oil pressure problem will be evident on hollow pushrod engines if no oil is reaching the rocker arms.
A lifter can become stuck because of varnish that accumulates between its plunger and body due to a lack of periodic oil changes.
A stuck lifter can sometimes be freed up by the addition of an additive to the oil, or by spraying fuel system spray cleaner down a hollow pushrod oil channel.
Lifters that stick because of varnish buildup can sometimes be loosened up by squirting carburetor spray cleaner down the hollow pushrod lubricating channel, where it contacts the rocker arm.
Hydraulic lifters are not rebuilt because they are relatively inexpensive. It is possible to disassemble and clean lifters but they must be reassembled with their mated parts. Because of the labor time involved, this procedure is usually impractical.
Sometimes a piece of foreign material becomes lodged in the lifter check valve. If the lifter is removed and disassembled before serious wear between the lifter and cam lobe results, it may be cleaned.
Worn mechanical (solid) lifters can be reground.
The base of the lifter is ground to a radius on a special lifter grinder.
Roller lifters have a longer service life than standard lifters.
Wear can occur on the roller pin. Some of these pins are serviceable.
It might occasionally be necessary to disassemble a hydraulic lifter to clean it or to inspect it.
If this is necessary, disassemble one lifter at a time and pay attention to the order of the check valve assembly.
Lifter disassembly is done by pressing down on the pushrod seat with your thumb and using a screwdriver to remove the snap ring.
Remove the plunger from the body; this may require tapping the body.
Next, remove the check valve assembly.
After thoroughly cleaning the lifter components in solvent, visually inspect them for signs of wear.
If the internal components pass inspection, the lifter can be reassembled.
During reassembly, cleanliness of the parts is of utmost importance.
Sorry but there is no valve adjustment with hydraulic lifters - can turn the lifter upside down fill with oil - let sit for a while and then tap on the lifters to see if they make noise - if noisy replace. Camshaft may be worn on the lobes or may have jumped timing if belt.
When installing new lifters, a pre-lube should always be applied to the lifter body. It is also a good idea to prime hydraulic lifters by submerging them in clean engine oil and depressing the plunger using an old pushrod. This allows the internal components of the hydraulic lifter to coat with oil before initial operation in the engine. All lifters should be replaced when a new camshaft is installed. If any valve train components (lifters, pushrods, rocker arms) are to be reused, they must be tagged or arranged during removal to assure installation in their original locations.
Remove the rocker arm cover.
Remove the cylinder head assembly from the engine.
Remove the bolts retaining the lifter anti-rotation brackets, then remove the brackets.
Remove the hydraulic roller lifters from the bores.
Inspect the lifter and lifter bore for wear and scuffing. Examine the roller for freedom of movement and/or flat spots on the roller surface.
Remove the bolts retaining the lifter anti-rotation brackets ...
... then remove the anti-rotation brackets
The lifters are located in bores in the engine block
Use a lifter removal tool to remove the lifters from the bore
To install: If installing a new lifter, coat the lifter body with a suitable camshaft pre-lube
Install each hydraulic lifter to its bore being careful to align the flat sides (top) of the lifters with the flat sides of the anti-rotation brackets. When properly installed the flat sides of each lifter are aligned parallel to the anti-rotation bracket. The roller at the bottom of the lifter is parallel to the camshaft lobe.
Make sure to properly align and install each lifter as improper installation of the lifters or brackets could result in engine damage.
Install the anti-rotation bracket retaining bolts and tighten to 97 inch lbs. (11 Nm).
Install the cylinder head.
Install the rocker arm cover.
Removing the hydraulic roller lifter from the 2.2L engine
VALVE LASH IS NOT REQUIRED IF YOU HAVE HYDRAULIC LIFTERS THEY ARE NONADJUSTABLE.IF YOU HAVE NOISEY VALVE LIFTERS.LIFTERS ARE WORN OR STOPPED UP WITH DIRT DUE TO DIRTY OIL.OIL HAS NOT BEEN CHANGED IN A WHILE.