ISUZU Starter Carbon Brush 8-94656040-1 OEM Fit

Starter Carbon Brush 8-94656040-1 / 8946560401 — ISUZU starter motor brush, rectangular carbon graphite with braided copper lead, OEM fit.

The Starter Carbon Brush with OEM numbers 8-94656040-1 and 8946560401 is the core current-conducting and commutation element inside ISUZU starter motors. Mounted in the starter brush holder, it maintains sliding contact with the rotating armature commutator under spring pressure, delivering battery current to the armature windings to generate the electromagnetic torque that cranks the engine.

During starter operation, high current from the battery (up to several hundred amperes) flows through the brush to the high-speed commutator and is distributed to the armature windings. The brush must simultaneously provide high conductivity (minimizing voltage drop and heat), wear resistance (extending replacement intervals), and self-lubrication (reducing commutator wear). The 8-94656040-1 brush uses a carbon graphite body with a braided copper lead, offering flexibility and vibration-fatigue resistance for frequent starting and high-current surges.

Once the brush wears to its limit, the lead breaks, or the brush sticks, the starter will crank weakly, fail to turn, or operate intermittently.

Replace the starter brush when any of these symptoms appear:

• Weak cranking or noticeably reduced starter speed — excessive brush wear reduces contact area and increases voltage drop, lowering cranking torque.
• Starter does not turn at all or only clicks — the brush is worn to the limit and cannot contact the commutator, so current cannot reach the armature.
• Intermittent starter operation (sometimes cranks, sometimes not) — the brush sticks in the holder, spring pressure is insufficient, or the lead connection is poor.
• Smoke or burning smell from the starter area during cranking — poor brush contact causes excessive arcing and localized overheating.
• Visible wear to the limit mark, broken lead, or cracked carbon body — structural failure requiring immediate replacement.
• Commutator surface shows burning, scoring, or severe eccentric wear — brush failure has affected the commutator; its condition must also be checked.

Because no complete application list for 8-94656040-1 is available in public databases, this brush cannot be matched by vehicle model or engine code alone. Fitment must be confirmed by one of the following:

1. Starter Nameplate Verification (Preferred) — Provide the starter model, part number, or manufacturer information from the nameplate.
2. Original Brush Measurement — Provide the L × W × H dimensions and lead specification of the removed brush with photos.
3. VIN Verification — Query the ISUZU global EPC system for the starter assembly number and corresponding brush part number.

Based on general ISUZU starter brush numbering patterns, this brush may be used in the following starter platforms:

1. Preparation: Disconnect the battery negative terminal. Remove the starter assembly. Clean the starter exterior.
2. Starter Disassembly: Remove the solenoid and end frame. Withdraw the armature or expose the brush holder.
3. Old Brush Removal: Note the brush orientation in the holder. Release the spring and remove the old brush and lead.
4. Inspection: Inspect the commutator surface for burning, out-of-round, or protruding mica. Check the brush holder for burning or distortion. Check spring pressure.
5. New Brush Installation: Insert the new brush into the holder, ensuring free sliding without sticking. Connect the lead and ensure the terminal is secure. Install the spring and confirm the brush contacts the commutator under spring pressure.
6. Starter Reassembly: Reassemble the starter in reverse order. Rotate the armature by hand to confirm smooth rotation.
7. No-Load Run-In: Run the starter at no load several times on a bench to observe brush-to-commutator seating.
8. On-Vehicle Test: Reinstall the starter, reconnect the battery, and attempt to start. Confirm strong cranking and no abnormal noise.

• At every starter overhaul: Replace all brushes.
• When weak cranking or intermittent operation is detected: Inspect brush wear and commutator condition immediately.
• When the brush reaches the wear limit or the lead breaks: Replace immediately.

• Standard Packaging: Anti-static bag / moisture barrier + neutral box.
• Custom Packaging: Neutral box, color box, or customer-branded packaging.
• Suitable For: Starter/electrical repair shops, ISUZU parts distributors, fleet maintenance centers.
• Supply Capacity: Stable batch supply with batch-level quality reports available.
• MOQ: Small quantities accepted (quantity discounts available).