스타터 모터 교환 수리 사례

2026. 6. 30. 작업

난이도 & 준비물

증상

Failing starter motor - why does whacking it help?

처리 내용

It can actually be the solenoid or the brushes which are at fault and take to getting a beating ... those masochistic machines! They just like it for some reason, lol. Most solenoids are built with a large copper washer in the end of them. When the solenoid is energized, the plunger is sucked into the solenoid via electromagnetic forces and pushes the copper washer into two large contacts. This allows current to flow to the starter motor itself, which spins the armature. If the washer or the two contacts get "bad spots" in them, contact will not be made and electricity doesn't flow. Rapping on the starter can move the washer slightly where good contact can be made and everything works correctly until the washer comes back around to the bad spot (the washer can spin freely inside it's solenoid home). Likewise, the brushes inside the starter can suffer a similar fate. Since the brushes ride on the commutator, they wear out over time. Here are a couple of images of what they loo