JUMP STARTER

560 503 59A JUMP STARTER is one of those small but crucial bits that keeps your engine starter motor spinning true. It’s basically a wear surface, a sleeve really, that supports the armature shaft where it goes into the starter housing. Without it, that shaft would just be grinding directly on the housing, and that’s a recipe for trouble. It keeps everything aligned and reduces friction, letting the starter motor engage smoothly with the flywheel to get the engine turning over.

When this bush starts to go, you’ll usually notice it. The first thing that often happens is the starter motor struggles a bit. You might hear a grinding or screeching sound when you try to crank the engine, especially if it’s cold or the battery isn’t quite at full charge. That’s the armature shaft getting out of alignment, causing the pinion gear to not mesh correctly with the flywheel. Sometimes it just sounds sluggish, like it’s dragging, and eventually, it might just refuse to engage altogether. You could also see increased current draw on the starter, which can cook other components if you let it go too long.

Replacing this bush isn't usually a standalone job; you're typically doing it as part of a starter motor overhaul or replacement. When you've got the starter off, always give the armature shaft a good look-over for scoring or wear where this bush rides. Don't just slap a new bush in if the shaft itself is chewed up, or you'll be doing the job again real soon. Also, make sure you clean out all the old grease and debris from the housing bore before pressing the new one in – a little grit can cause premature wear on even a brand new bush.