1969 Evinrude 40 HP Big Twin, Big Twin Electric Lark Service Manual 4596, Page 91Get this manual
cTo disassemble starter drive, remove drive nut on armature shaftTo remove nut, clamp pinion between soft wood blocks in vise DO NOT place armature assembly between vise jawsNote the relative positions of the parts while disassembling to aid in reassembly laterSee Figure 7-9 12 VOLT
CLEANING, INSPECTION, AND REPAIR
a Inspect the brushes; replace if one-half worndamaged, or crackedReplace brush springs if weakbClean commutator with grade 00 sandpaperIf commutator surface is unevenly worn or pitted, turn on latheRemove any trace of oil from commutatorcCheck the armature on growler for shorted turnsSee Figure 7-10Check armature for grounding by using test light or meterSee Figure 7-11Inspect armature insulation for indications of overheating or damaged windingsClean off any de posits of carbon or foreign matter which may contribute to later failure of the windingsdCheck field windings, using test light to check for continuity between field brush lead and frame of motor (ground)See Figure 7-12 Figure 7-13Checking Solenoid