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 MANUALSCHEVROLET2003EXPRESS 1/2 TON VAN V6-4.3L VIN XREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINESERVICE AND REPAIROVERHAULREPAIR INSTRUCTIONS66. BALANCE SHAFT INSTALLATION
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN X
66. Balance Shaft Installation
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN XSECTION 66. Balance Shaft Installation
Balance Shaft Installation
^ Tools Required
- J 8092 Universal Driver Handle
- J 36660-A Torque Angle Meter
- J 36996 Balance Shaft Installer
Important: The balance shaft and the balance shaft front bearing are serviced only as an assembly. Do not remove the balance shaft front bearing from the balance shaft.
1. Apply clean engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent, to the balance shaft front bearing.
Caution: Refer to Safety Glasses Caution in Service Precautions.
2. Use the J 36996 and the J 3092 in order to install the balance shaft.
Notice: Refer to Fastener Notice in Service Precautions.
3. Install the balance shaft retainer and bolts.
^ Tighten the bolts to 12 Nm (106 inch lbs.).
4. Install the balance shaft driven gear onto the balance shaft.
5. If reusing the fastener, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the threads of the balance shaft driven gear bolt.
6. Install the balance shaft driven gear bolt.
6.1. Use a wrench to secure the balance shaft.
Place the wrench onto the balance shaft near to the balance shaft front bearing.
6.2. Install the balance shaft driven gear bolt.
6.2.1. Tighten the balance shaft driven gear bolt on the first pass to 20 Nm (15 ft. lbs.).
6.2.2. Tighten the balance shaft driven gear bolt on the final pass using the J 36660-A an additional 35 degrees.
7. Remove the wrench from the balance shaft.
8. Rotate the balance shaft by hand in order to ensure that there is clearance between the balance shaft and the valve lifter pushrod guide. If the balance shaft does not rotate freely, check to ensure that the retaining ring on the balance shaft front bearing is seated on the case.
Important: DO NOT install the camshaft sprocket bolts at this time.
9. Install the balance shaft drive gear.
10. Rotate the engine camshaft so that the timing mark on the balance shaft drive gear is in the 12 o'clock position.
11. Remove the balance shaft drive gear.
12. Rotate the balance shaft so that the timing mark on the balance shaft driven gear is in the 6 o'clock position.
13. Position the balance shaft drive gear onto the engine camshaft.
14. Look to ensure that the balance shaft drive gear and the balance shaft driven gear timing marks are aligned.
^ Tools Required
- J 8092 Universal Driver Handle
- J 36660-A Torque Angle Meter
- J 36996 Balance Shaft Installer
Important: The balance shaft and the balance shaft front bearing are serviced only as an assembly. Do not remove the balance shaft front bearing from the balance shaft.
1. Apply clean engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent, to the balance shaft front bearing.
Caution: Refer to Safety Glasses Caution in Service Precautions.
2. Use the J 36996 and the J 3092 in order to install the balance shaft.
Notice: Refer to Fastener Notice in Service Precautions.
3. Install the balance shaft retainer and bolts.
^ Tighten the bolts to 12 Nm (106 inch lbs.).
4. Install the balance shaft driven gear onto the balance shaft.
5. If reusing the fastener, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the threads of the balance shaft driven gear bolt.
6. Install the balance shaft driven gear bolt.
6.1. Use a wrench to secure the balance shaft.
Place the wrench onto the balance shaft near to the balance shaft front bearing.
6.2. Install the balance shaft driven gear bolt.
6.2.1. Tighten the balance shaft driven gear bolt on the first pass to 20 Nm (15 ft. lbs.).
6.2.2. Tighten the balance shaft driven gear bolt on the final pass using the J 36660-A an additional 35 degrees.
7. Remove the wrench from the balance shaft.
8. Rotate the balance shaft by hand in order to ensure that there is clearance between the balance shaft and the valve lifter pushrod guide. If the balance shaft does not rotate freely, check to ensure that the retaining ring on the balance shaft front bearing is seated on the case.
Important: DO NOT install the camshaft sprocket bolts at this time.
9. Install the balance shaft drive gear.
10. Rotate the engine camshaft so that the timing mark on the balance shaft drive gear is in the 12 o'clock position.
11. Remove the balance shaft drive gear.
12. Rotate the balance shaft so that the timing mark on the balance shaft driven gear is in the 6 o'clock position.
13. Position the balance shaft drive gear onto the engine camshaft.
14. Look to ensure that the balance shaft drive gear and the balance shaft driven gear timing marks are aligned.
RENDER: 1.0x
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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.