![]() ![]() Patrol Sense US NAVY 1944Webmaster:Copyright 2003 bySacramento Sky Ranch Inc. Circuit Diagram and parts Identification- magneto Timing light. This may account for differences in rpm drop betweenmagnetos when doing the magneto check.If you encounter an enemy aircraft, you willprobably be a little busy. Home > Ordnance Documents and other related manuals > Figure 3. They estimate E gap.Comparing this method with the tool shown above you can be offconsiderably. Now adjust the points to be just opening and you havethe optimum point of magneto energy.Note: many mechanics do not use this simple tool. The tool locks the rotor in the exact positionthat the points should open.Slick magneto showing points and plastic cam followerSlick E gap timing tool inserted into slot in rotor andagainst poll shoes. Most Lycoming engines have magnetos with left-hand rotation. ![]() ![]() ![]() The data plate on the side of the magneto (right) will show if it is a right- or left-hand rotation mag. Be sure to read the instructions for your timing light. E gap is reduced.Sincethe aircraft magneto E gap has not been measured but approximated bysetting point clearance, the first signs of trouble occur when theengine runs rough because of spark plug misfire.Newer Slick 43 magnetos use aT-150 tool to set E gap. This timing light works by turning the lights off and making a tone when the points open for each magneto (left). A point gap of.018 inch now occursfurther up the cam lobe now that the points have worn. ![]()
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