Crankshaft Gear Z=42 8-94394342-4 8943943424 For ISUZU 6HE1T 4HK1TCS 6HH1 Engine

The Crankshaft Gear (OEM Numbers: 8-94394342-4 / 8943943424 / Z=42) is a premium-quality, direct replacement engine timing component designed specifically for ISUZU medium-duty and heavy-duty trucks equipped with 6HE1T, 4HK1TCS, and 6HH1 diesel engines.

This precision-engineered gear, featuring 42 teeth (Z=42), is mounted on the rear of the crankshaft and drives the camshaft and fuel injection pump via the timing gear train, ensuring precise synchronization of valve opening/closing and fuel injection events with piston position.

• OE Quality: Manufactured to strict ISUZU dimensional and material specifications for perfect fit and function.
• Precision Gear Teeth: Accurately cut and ground teeth ensure proper mesh with camshaft and injection pump gears.
• Induction-Hardened: Advanced heat treatment provides exceptional wear resistance and long service life.
• High-Strength Alloy Steel: Forged construction withstands high torsional loads and shock from engine operation.
• Accurate Timing: Precise tooth geometry ensures correct valve and injection timing for optimal engine performance.
• Quiet Operation: Precision-ground gear profiles minimize noise and gear whine during operation.
• Optimal Backlash: Engineered to provide proper gear lash for smooth, reliable timing train operation.
• Restores Timing Accuracy: Eliminates timing errors caused by worn or damaged gear teeth.
• Direct Replacement: Simple installation - matches OE gear dimensions and mounting configuration.

This crankshaft gear is specifically designed for ISUZU medium-duty and heavy-duty trucks and industrial equipment. Common applications include:

• ISUZU LT132 (Heavy-Duty Trucks)
• ISUZU FSR33 (Medium-Duty Trucks)
• ISUZU FRR33 (Medium-Duty Trucks)
• ISUZU 6HE1T Engine Specifications:
  • 6-Cylinder, Inline Turbo Diesel
  • Displacement: 7.2L
  • Application: Medium-duty trucks
• ISUZU 4HK1TCS Engine Specifications:
  • 4-Cylinder, Inline Turbo Diesel
  • Application: Medium-duty trucks and industrial use
• ISUZU 6HH1 Engine Specifications:
  • 6-Cylinder, Inline Diesel
  • Displacement: 8.2L
  • Application: Medium-duty trucks, buses, and industrial equipment
• Industrial Applications: Generators, construction machinery, and agricultural equipment utilizing these engine models

Professional engine builder or mechanic installation required:

1. Disconnect the battery - Ensure safety before working on engine components.
2. Drain engine oil - Drain oil to prevent contamination during assembly.
3. Remove timing gear cover - Unbolt and remove the timing gear housing cover.
4. Note timing marks - Identify and record all timing marks on the crankshaft gear, camshaft gear, and injection pump gear before disassembly.
5. Remove the crankshaft gear - Use a proper gear puller tool; do not pry or hammer on the gear teeth.
6. Remove the gear key/spline - Carefully remove the woodruff key (if fitted) from the crankshaft.
7. Inspect the crankshaft - Check the crankshaft taper, keyway, or spline for wear, scoring, or damage.
8. Clean all components - Thoroughly clean the mounting surfaces; remove any old sealant or debris.
9. Install the new gear - Align the gear with timing marks and mounting orientation; press or slide into position.
10. Install the gear key/spline - Ensure the key or spline is correctly positioned.
11. Torque the retaining bolt - Install and torque the center bolt to manufacturer specifications if applicable.
12. Check gear backlash - Use a dial indicator to measure gear lash; adjust if out of specification.
13. Reinstall timing gear train - Ensure all timing marks are correctly aligned per manufacturer specifications.
14. Reinstall timing cover - Replace the cover gasket and install the timing gear housing cover.
15. Refill engine oil - Fill with the correct oil grade and quantity.
16. Start and test - Start the engine; listen for abnormal gear noise and verify engine timing.

• Material Verification: Confirms alloy steel composition meets ISUZU strength and durability specifications.
• Tooth Profile Inspection: Gear teeth 100% inspected for profile accuracy, pitch, and tooth form.
• Hardness Testing: Induction-hardened teeth tested to ensure consistent surface hardness.
• Dimensional Inspection: Gear diameter, bore size, and overall dimensions verified within OEM tolerances.
• Backlash Verification: Sample tested to ensure proper gear mesh characteristics.
• Visual Inspection: 100% checked for machining defects, cracks, or surface imperfections.
• Packaged Safely: Protected with anti-rust oil and securely boxed to prevent damage during transit.

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea