You need two gauges: a .006" "go" gauge and a .008" "no go" gauge. When the valve is adjusted correctly, the .006 will go in and the .008 will not.
A feeler gauge is typically used to measure dynamic valve clearance in internal combustion engines. The gauge is inserted between the valve stem and the rocker arm to determine the correct clearance while the engine is running.
feeler gauge
0,25 both regarding to the BOOK
.022 gap with a feeler gauge.
0.03mm is the least count for feeler gauge
26-30 degree dwell or adjust points to .017 with a feeler gauge.
If you can't fit a feeler gauge between the adjusting bolt and the valve, it may indicate that the clearance is too tight. Double-check that the engine is at the correct temperature and that you are using the correct size of feeler gauge for the specified clearance. If necessary, try loosening the adjusting bolt slightly to create enough space for the gauge. If problems persist, consult the service manual for the specific engine to ensure proper adjustment procedures.
the thickness of a paper match stick is real close.
To calibrate a feeler gauge using a caliper, measure the thickness of the feeler gauge blades at multiple points along the length using the caliper. Check these measurements against the stated thickness of the blades to ensure accuracy. Make any necessary adjustments to the feeler gauge if the measurements deviate significantly.
not that critical 0.8mm or if you dont have feeler guages the back side of a hacksaw blade will do ( the side without the teeth) the standard contact breaker gap is 0.12mm - 0.13mm rotate the rota so the points are fully open then insert the feeler gauge realese the locking screw so that it shuts on the feeler gauge then lock the screw off (just nip tight as it can break real easy)then remove the feeler gauge then your done. i know this as i have done so many.
It varies from manufacturer to manufacturer, but if you have a feeler gauge, try setting it at 0.011 to start, in a pinch a matchbook cover or business card will get you really close to the appropriate setting.
Some spark plugs come pre- gaped depending on the vehicle and type of spark plug. But even pre-gaped plugs should be checked with a feeler gauge to be sure it is correct If the plugs you are using are not pre-gaped a feeler gauge must be utilized in order to get an accurate gap reading. Your local auto parts store can help you with what the gap should be for your vehicle.