A feeler gauge is actually a set of very fine strips of steel used to measure small gaps such as plug gap of an auto plug, or gaps in bearing surfaces.
feeler gauge
0.03mm is the least count for feeler gauge
to measure spark plug gap
A .020" feeler gauge.
0,25 both regarding to the BOOK
The first generation of electronic ignition systems had a requirement to set the air gap between the reluctor and the pickup. It had to be set with a non ferrous metal gauge. That is why the brass blade in a feeler gauge set.
.20 thousand on a feeler gauge
Adjusting the valves on a Caterpillar C 15 Engine is easy and does not take long at all. All you need is a wrench and a feeler gauge, You will then loosen up the bolt, place the feeler gauge in between the rocker arm and valve and then turn the wrench until the rocker arm touches the feeler gauge.
When was the last time you changed your spark plugs and wires? DO NOT USE A FEELER GAUGE ON THE PLUGS... THEY ARE PRESET AT THE FACTORY AND A FEELER GAUGE OR GAPPING TOOL WILL RUIN THE PLATINUM COATING.
By the use of feeler gauge and with dial indicator as possible.
.022 gap with a feeler gauge.
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.