High-Strength Alloy Steel Timing Gear Heat-Treated HRC 50-55 with Precision-Hobbed Teeth for Isuzu 4JA1 Engine

Timing gear (camshaft drive gear) transmits rotational motion from the crankshaft to the camshaft, ensuring precise valve and injection timing for Isuzu 4JA1 diesel engines.

• OE Quality: Manufactured to Isuzu dimensional and material specifications for perfect fit and reliable timing
• Precision Gear Teeth: Hobbed and ground for accurate tooth profile and quiet operation
• Heat-Treated: HRC 50-55 surface hardness for wear resistance; tough core absorbs shock
• Precision Bore: Accurately machined with keyway for proper alignment
• Restores Engine Timing: Eliminates timing drift, rough running, and power loss
• Direct Replacement: Matches OE gear dimensions - simple bolt-on installation
• Cost-Effective: Affordable alternative to genuine OEM gears

This timing gear is specifically designed for Isuzu NHR54 trucks with 4JA1 engine.

• ISUZU NHR54 (light-duty truck, 4JA1 engine)
• May also fit other Isuzu models with 4JA1 engine (e.g., NKR, TFR) - verify compatibility

• 4-Cylinder, Inline Diesel, OHV
• Displacement: 2.5L (2499cc)
• Application: NHR54, NKR, and industrial equipment

Installation steps overview for timing gear replacement:

1. Remove the front timing cover and any components blocking access
2. Remove the old timing gear (using a puller)
3. Inspect the mating gear (crankshaft gear or idler gear) for wear
4. Clean the shaft and keyway
5. Install a new key and slide the new gear onto the shaft
6. Install the retaining washer and bolt, torque to specification
7. Ensure timing marks are correctly aligned between crankshaft and camshaft gears
8. Reinstall timing cover and associated components
9. Start engine and check for abnormal noise

• Material Verification: Alloy composition and hardness tested
• Dimensional Inspection: Tooth profile, pitch diameter, bore size, and runout verified
• Hardness Testing: Surface hardness (HRC 50-55) confirmed
• Magnetic Particle Inspection: 100% crack detection
• Visual Inspection: 100% checked for burrs or machining defects
• Packaged Safely: Coated with anti-rust oil, wrapped in plastic, boxed with foam

• 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