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If there were no wear, the valves wouldn't need adjusting. The reason for periodically adjusting the valves is to compensate for the wear that the valve train undergoes over the life of the engine. Be optimistic! Have confidence that adjusting the valves will reduce the noisy valves.
Maybe something wrong with the mechanism inside the toilet fill valve. Try to adjust the fill valve first. I found this one about adjusting fill valve, I hope it can help you.
If your engine is an overhead valve Briggs. You need to: Remove valve cover Locate rocker arms. Upper is exhaust, Lower is intake. Loosen the lock screw in the center of the adjusting nut. With engine at TDC and both valves closed adjust both valves by turning the adjusting nut to obtain proper clearance. Once set, tighten the center lock screw. Valve adjustment specifications vary from model to model. Would need more engine information to get you that or it can be found online. Reinstall valve cover, make sure gasket did not get damaged. Adjust valves on a "cold" engine.
Before servicing the vehicle, refer to the precautions in the beginning of this section.
Remove the valve cover.
Set the engine to Top Dead Center (TDC) of the compression stroke for the cylinder to be adjusted.
Check the valve clearance. The valve clearance specifications are as follows:
Intake valves: 0.005-0.007 inches (0.13-0.17mm)
Exhaust valves: 0.005-0.007 inches (0.13-0.17mm)
After adjustment, tighten the locknuts to 11-14 ft. lbs. (15-19 Nm).
Repeat for each valve to be adjusted.
1.8L, 2.0L and 2.5L Engines
The 1.8L, 2.0L and 2.5L engines utilize automatic hydraulic lash adjusters to maintain proper valve lash at all times. Periodic valve lash inspection and adjustment is not necessary or possible.
adjustment with 4000 feeler gauge
adjust top valve when the bottom valve is fully compressed and than with the top valve fully compressed adjust the bottom valve the same way.
very easy But remember to losen the center tork screw before adjusting the rocker arm nut
adjust your valves your oil pickup tube needs to be adjusted you need feeler guages to adjust the valves down properly
make sure lifters and oil pick up tubes are not clogged
feeler guage is---> thin pieces of metal cut to different sizes to hold under valve adjusters till the play and chatter gone
check by book what the feeler size needed for adjustment
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