Mitsubishi S4S-D — Inspection and Repair of Starter
Testing & diagnosis
For the Mitsubishi S4S-D, from the Mitsubishi service manual.
Applies to: Mitsubishi S4S-D, Mitsubishi S4S engine
Before you start
- Do not wash the overrunning clutch in wash oil.
Procedure
- Inspect brushes for wear and measure brush length.
- Measure brush spring load with a spring balance.
- Inspect brush holders for grounding and looseness.
- Measure commutator radial runout and outside diameter; measure mica undercutting.
- Test armature coil for short circuit, grounding and open circuit.
- Inspect field coil for continuity and grounding.
- Check bearings rotate smoothly.
- Inspect overrunning clutch and pinion.
- Inspecting front and rear brackets, internal/planetary gears and lever.
- Inspect magnet switch and starter relay.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Brush length limit varies by model (e.g. M8T75171 Amazon eBay FridayParts $156.00 10.7 mm)
- Commutator radial runout limit 0.10 mm
- Commutator outside diameter limit (e.g. 31.4 mm / 38.1 mm)
- Mica undercutting 0.4 to 0.6 mm, limit 0.2 mm
- Pinion gap 0.5 to 2.0 mm
Source: Mitsubishi service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.