1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 235Get this manual
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4Remove pinion and base
[]] INote Before disassembly, scribe marks on frame and end
caps for reference during reassembly
5Remove the two thru-bolts and separate components
Cleaning and Inspection
1Inspect the brushes; replace if one-half worn, damaged, or crackedReplace brush springs, if weak2Clean commutator with 300 grade emery clothIf commutator surface is unevenly worn or pitted, turn on latheRemove any trace of oil or metal dust from commutator
3Check the armature on growler for shorted turnsCheck armature for grounding by using test light or meterInspect armature insulation for indications of overheating or damaged windingsClean off any deposits of carbon or foreign matter which may contribute to later failure of the windings