Isuzu 6HK1 engine crankshaft gear 894392-2551 Z=42, Sany material code: 60311968

Isuzu 6HK1 Engine Crankshaft Gear 894392-2551 Z=42, Sany Material Code: 60311968
Core Information
- OEM Number: 8-94392255-1 (894392-2551)
- Sany Material Number: 60311968
- Compatible Engines: Isuzu 6HK1 (Electro-injection/Direct Injection), 4HK1
- Number of Teeth: 42 teeth (Z=42), Crankshaft Timing Main Gear
- Function: Located at the engine power output end, serves as the primary power source for the timing system → drives the 61-tooth idler gear → camshaft gear + 34-tooth oil pump idler gear
- Compatible Models: Sany SY305/SY335/SY365/SY375; Hitachi ZX300/330/360-5A; Sumitomo SH350, etc.
- Material: High-quality alloy steel forging, tooth surface high-frequency quenching (HRC58-62), high torque resistance, fatigue resistance, and anti-tooth breakage
Key Features
- Structure: Single-row 42 teeth, fixed at the crankshaft front end via hot fitting/keyway, active wheel of the timing system
- Gear Ratio: 42 teeth → 61 teeth → Camshaft (reduction ratio of 1.45x, matching four-stroke valve timing)
- Installation Location: Front end of the crankshaft, bottom of the timing gear chamber, starting point of power input
- Interchangeability: Not interchangeable with 34-tooth oil pump idler, 61-tooth timing idler, or triple idler; dedicated crankshaft gear for 6HK1/4HK1
Purchase and Installation Notes
- Code Verification: Confirm 894392-2551 + 60311968 + Z=42; distinguish between 4HK1/6HK1, direct injection/electro-injection
- Replacement Timing: Must replace when crankshaft overhaul, timing gear skipping, abnormal noise, sudden power drop, or heavy black smoke occurs; old gears must not be reused
- Installation Focus:
1. Gear timing marks must face up/align, with top dead center of cylinder 1 positioned correctly
2. Crankshaft配合: Hot fitting/oil pressure assembly, interference fit of 0.02–0.04mm
3. Bolt torque: 80–90N·m, double insurance with anti-loosening compound and lock washer
- Fault Correlation: Timing misalignment, valve hitting, crankshaft oil seal leakage, idle vibration – prioritize inspection for wear/cracks in this 42-tooth crankshaft gear