Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1985S10/T10 BLAZER 4WD L4-151 2.5LREPAIR AND DIAGNOSISSTARTING AND CHARGINGSTARTING SYSTEMSTARTER MOTORSERVICE AND REPAIR
1985 Chevrolet S10/T10 Blazer 4WD L4-151 2.5L
Starter Motor: Service and Repair
1985 Chevrolet S10/T10 Blazer 4WD L4-151 2.5LSECTION Service and Repair
STARTER MOTOR REPLACEMENT
Remove or Disconnect
- Place the vehicle on a hoist.
1. Negative battery cable.

2. Brush end mounting bracket on the 2.5L engine starter motor.
3. Solenoid wiring.
On the 4.3L, raise the vehicle halfway on the hoist, and reach through the right wheel well.
- Raise the vehicle.
4 Wheel Drive Vehicles:
4. Four bolts on the skid plate (if equipped).
5. Skid plate (if equipped).
8. Bolts and the two brackets holding the brake line to the crossmember.
7. Crossmember (three bolts on each side).
8. Bracket holding the transmission fluid cooler lines to the flywheel housing, brace rod to the flywheel housing and/or the lower flywheel housing if necessary.
All Models:
9. Two bolts holding the starter to the engine.
10. Starter and the shim (if present).
Install or Connect




1. Starter and shim (if present) to the engine with bolts.
Tighten
- Bolts on the 2.5L engine to 43 N.m (31 ft. lbs.).
- Bolts on the 2.8L and 4.3L engines to 45 N.m (33 ft. lbs.).
4 Wheel Drive Vehicles:
2. Lower flywheel housing (if removed).
3. Transmission lines bracket to the housing (if present).
4. Brace rod to the housing (if equipped).
5. Crossmember to the frame end with six bolts.
6. Two brake line brackets to the crossmember with bolts.
7. Skid plate (if equipped).
4.3L Engine:
- Lower the hoist halfway.
8. Solenoid wiring by reaching through the right wheel well.
All Vehicles:
- Lower the vehicle.

9. Brush end mounting bracket and wiring (2.5L).
Tighten
- Mounting bracket nuts to 8 N.m (75 in. lbs.).
10. Wires to the solenoid terminals.
11. Negative battery cable.
Remove or Disconnect
- Place the vehicle on a hoist.
1. Negative battery cable.
Starter Motor Mounting On The 2.5L Engine:
2. Brush end mounting bracket on the 2.5L engine starter motor.
3. Solenoid wiring.
On the 4.3L, raise the vehicle halfway on the hoist, and reach through the right wheel well.
- Raise the vehicle.
4 Wheel Drive Vehicles:
4. Four bolts on the skid plate (if equipped).
5. Skid plate (if equipped).
8. Bolts and the two brackets holding the brake line to the crossmember.
7. Crossmember (three bolts on each side).
8. Bracket holding the transmission fluid cooler lines to the flywheel housing, brace rod to the flywheel housing and/or the lower flywheel housing if necessary.
All Models:
9. Two bolts holding the starter to the engine.
10. Starter and the shim (if present).
Install or Connect
Meshing Starter And Flywheel Teeth:
Flywheel To Pinion Clearence:
Shimming The Starter Motor On The 2.8L Engine:
Shimming The Starter Motor On The 2.8L Engine:
1. Starter and shim (if present) to the engine with bolts.
Tighten
- Bolts on the 2.5L engine to 43 N.m (31 ft. lbs.).
- Bolts on the 2.8L and 4.3L engines to 45 N.m (33 ft. lbs.).
4 Wheel Drive Vehicles:
2. Lower flywheel housing (if removed).
3. Transmission lines bracket to the housing (if present).
4. Brace rod to the housing (if equipped).
5. Crossmember to the frame end with six bolts.
6. Two brake line brackets to the crossmember with bolts.
7. Skid plate (if equipped).
4.3L Engine:
- Lower the hoist halfway.
8. Solenoid wiring by reaching through the right wheel well.
All Vehicles:
- Lower the vehicle.
Starter Motor Mounting On The 2.5L Engine:
9. Brush end mounting bracket and wiring (2.5L).
Tighten
- Mounting bracket nuts to 8 N.m (75 in. lbs.).
10. Wires to the solenoid terminals.
11. Negative battery cable.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.