Starter & Alternator Repairs

At Greenaway we are proud to have the top unit man in Ireland.  We not only supply new starter and alternators to many large firms but importantly we can diagnose, test and repair your own unit.  This greatly reduces the cost and can save time and money.  As starter and alternators are basically wear and tear items be sure to keep us in mind when your dreaded battery warning light appears or your dash or when you get that click click noise coming from your starter motor in the morning.

We can repair starters and alternators from many manufacturers such as:

  • Ducellier
  • Motorola
  • Paris – Rhone
  • Sev
  • Bosch
  • Lucas
  • Delco
  • Butel
  • Marelli
  • Prestolite
  • Mitsubushi
  • Mitsuba
  • Valeo
  • Denso
  • Motorcraft
  • C.A.V
  • Nikko
  • Pal
  • Magneton
  • Iskra
  • Hino
  • Hitachi
  • Sawafuti

How does a starter works?

A starter is a component that converts electrical energy into mechancial energy.  The electrical energy is supplied from the vehicle battery.  When the starter switch is operated, current flows through the starters field coils and armature conductors and two magnetic fields are set up.  These magnetic fields cause a turning movement, which is used for rotating the engines flywheel.

A considerable amount of mechancial power is required to start the engine (about 2 or 3 h.p) and the starting current is usually in the region of 250 to 500 amps.

Starter Components:

  • Bushes
  • Bearings
  • Solenoids
  • Drives
  • Planetary gear
  • Coils
  • Armature
  • Brush
  • Brush holder
  • Fork lever

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How an Alternator works?

An alternator produces alternative current (A.C) which is converted to direct current (D.C) before being connected to the vehicle electrical system (a batter can only store direct current).  The conversion from alternative current to direct current is done by diodes (both neg – and pos +) fitted in the rectifier, the output of the alternator is controlled by means of a regulator 14.4 volts for a 12v system and 28 volts for a 24v system, these are the most common settings.

Alternator Components:

  • Rectifier
  • Brushes
  • Bearings
  • Scip-rings
  • Brush box
  • Rotor
  • Stator
  • Regulator

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