Metal AC Compressor Clutch Assy Repair Kit 4089686 4089687 9111546506 for Cummins QSB6.7 Engine Heavy Duty Truck Diesel Engine Cooling System

Product SpecificationsPart Numbers: 4089686, 4946291, 4089687, 9111546506Engine Application: For Cummins QSB6.7 diesel (6.7L, 2010-2018 typical)Compressor Type: SD7 or similar reciprocating compressor (verify on your truck)Voltage: 12V or 24V (For Cummins QSB6.7 typically 12V in trucks - verify before ordering)Pulley Type: Multi-groove serpentine (6PK or 8PK - count ribs on your belt)Clutch Gap Spec: 0.3mm - 0.6mm (0.012 - 0.024 inches)Coil Resistance: Approximately 3-5 ohms at 20°C (varies by voltage)Kit Contents1 x Clutch hub with rubber torsion damper1 x Pulley with pre-installed bearing1 x Electromagnetic coil with weather-sealed connector1 x Assorted shim set for air gap adjustment1 x Retaining snap ringNote: Compressor body, belt, hoses, and refrigerant are NOT includedCompatible with Cummins QSB6.7 ApplicationsFreightliner M2 106 / 112 with QSB6.7 (2010-2018)Kenworth T270 / T370 with QSB6.7Peterbilt 220 / 325 / 337 with QSB6.7International Durastar / WorkStar with QSB6.7Various bus and RV chassis with QSB6.7 powerAC Clutch Failure Symptoms on QSB6.7No engagement when AC turned ON: Coil failure - no magnetic field pulls clutch plate. Check for 12V/24V at 4089686 coil connector with engine running and AC ON.Clutch slips under load: Excessive air gap (worn friction surface) or weak coil. AC cycles on/off rapidly or belt squeals on your QSB6.7.Constant noise when AC is OFF: Pulley bearing failure in the 4946291 assembly - grinding or rumbling from compressor front.AC works intermittently: Electrical connection corrosion or failing 4089687 coil. Works sometimes, fails others.Burning smell from AC area: Clutch slipping constantly - immediate replacement required to prevent belt damage for Cummins 6.7.Critical Usage Notes for QSB6.7 OwnersDo Not Run Compressor Without Refrigerant: The AC compressor for Cummins QSB6.7 requires refrigerant oil circulation for lubrication. Running this 4089686 AC clutch without proper refrigerant charge destroys the compressor internally.Clutch Gap Must Be Verified: The most common installation mistake on QSB6.7 AC clutches is incorrect air gap. Too large (over 0.6mm) = clutch won't engage. Too small (under 0.3mm) = clutch drags when OFF, causing premature wear on the 4946291 assembly. Always measure after installation.Coil Polarity Not Important: The electromagnetic coil on this 4089687 clutch is not polarity sensitive. Either wire can be connected to positive or negative on your heavy duty truck.Belt Tension: After reinstalling the serpentine belt on your QSB6.7, verify tension is correct. Overtightened belt overloads the pulley bearing on the 9111546506 assembly. Use belt tension gauge - spec varies by truck manufacturer.

• 🔧 Part Number Verification - 4089686 AC compressor clutch repair kit replaces multiple OEM numbers: 4089686, 4946291, 4089687, and 9111546506. Before ordering this clutch assy for Cummins QSB6.7 engine, verify your original failed clutch matches one of these numbers. The 4089686 kit is specific to the QSB6.7 AC compressor - not for ISB6.7 or other for Cummins variants.
• 🚛 QSB6.7 Engine Application - 4946291 compressor clutch repair kit is designed for Cummins QSB6.7 diesel engines in heavy duty trucks. The 4089687 clutch components fit the factory AC compressor mounted on the QSB6.7 front accessory drive. Compatible with 6.7L engines in Freightliner, Kenworth, Peterbilt, and International trucks with Cummins power. Not for ISX or smaller ISB engines.
• 📦 Complete Clutch Kit Contents - 9111546506 AC clutch repair kit includes all components needed to rebuild the QSB6.7 compressor clutch: clutch hub with rubber damper, pulley with bearing, electromagnetic coil with connector, shims for air gap adjustment, and retaining snap ring. One complete 4089686 kit eliminates separate part hunting for your heavy duty truck AC repair.
• ⚠️ Symptoms Requiring This Kit - For Cummins QSB6.7 AC blows warm air but the compressor pulley spins freely, the 4089686 clutch coil may have failed. A seized 4946291 clutch that won't disengage or makes grinding noise when AC is OFF indicates worn pulley bearing. Intermittent cooling points to air gap exceeding specification. Replace this AC compressor clutch assy on your QSB6.7 before the failed component damages the 4089687 belt or seizes the compressor.
• 🔧 Professional Installation Required - Installing 4089686 AC clutch repair kit requires removing the compressor from your QSB6.7 or replacing clutch in-place with special pullers. The clutch air gap must be set to 0.3-0.6mm (0.012-0.024 inches) using included shims. Incorrect gap on this 4946291 clutch causes slippage or failure to engage. Recover refrigerant before compressor removal. After installing this 9111546506 clutch assy for Cummins QSB6.7, evacuate and recharge AC system properly.