The mechanism

The electric starter motor or starting motor is the most common type used on gasoline engines and small diesel engines. The modern starter motor is either a permanent-magnet or a series-parallel wound direct current electric motor with a starter solenoid (similar to a relay) mounted on it. When current from the starting battery is applied to the solenoid, usually through a key-operated switch, the solenoid engages a lever that pushes out the drive pinion on the starter driveshaft and meshes the pinion with the starter ring gear on the flywheel of the engine.

Motor & Gearbox

There is a motor behind the starter motor which is connected to the drive but mostly nowadays it is connected through a gearbox. Basically gearbox reduces the volume of starter motor. A smaller, higher revving motor can now be used with the added benefits of lower weight and current requirements. The downside is that the armature is now spinning very fast indeed and the gearboxes have been known to fail. The gearboxes themselves are relatively simple to repair and on the whole can easily be tacked by any competent D.I.Y mechanic.

Modern vehicles come with combined charging and starting system along with quick start mechanism. When vehicle stops engine also stops and restart when accelerator is pressed which reduced fuel consumption and emission

Barking MOT Centre provides full working and repairing or replacement for starter motors. If you have any query you can get a free advice from us. Just write us on or fill up our enquiry form or alternatively give us a short call.