WIHMCCK AUTO PARTS – PREMIUM QUALITY?? CRITICAL – PLEASE READ BEFORE ORDERING. Compatible with Detroit Diesel Series 60 12.7L (PRE-EGR, 2004 & Older) engines ONLY. NOT compatible with Series 60 14.0L engines? NOT compatible with 2005+ EGR engines?? This is a complete Accessory Drive Assembly with 8-Groove Serpentine Belt and 34-Tooth Helical Drive Gear. Verify your original drive configuration before ordering! Please confirm your engine model and original part number before ordering. Front Engine Accessory Drive? Detroit Series 60 12.7L ·. 8-Groove Serpentine · 34-Tooth Helical Gear · Direct Bolt-On. REPLACES 23523998 · R23523998 · 680371? FREIGHTLINER CLASSIC · COLUMBIA · CENTURY CLASS · FLD120? WIHMCCK Accessory Drive Assembly. Is a premium direct OEM replacement for. Detroit Diesel Series 60 12.7L (PRE-EGR, 2004 and Older). Front engine accessory drive assembly. 8-groove serpentine belt pulley. 34-tooth helical drive gear. It mounts directly to the front engine timing cover and drives the alternator, water pump, and other accessory components. The assembly includes an. For a complete installation. Restores accessory drive system? Complete assembly? Built for the long haul. ? COMMON FAILURE SYMPTOMS – FIXED BY THIS PART. Serpentine belt slipping or squealing from the accessory drive pulley. Accessory drive gear wear causing timing/accessory noise. Oil leaking from the front timing cover seal area. Alternator or water pump not spinning at correct speed. Belt misalignment or excessive vibration from the front engine area. Visible gear tooth wear or pitting on the 34-tooth helical gear. ? DETROIT S60 12.7L ONLY. NOT compatible with Series 60 14.0L or 2005+ EGR engines. Detroit Series 60 12.7L. Engine Accessory Drive Assembly. Front Engine Timing Cover. 1x Accessory Drive Assembly · O-Ring. 12 lbs (5.4 kg). REPLACES OEM & INTERCHANGE PART NUMBERS. Also replaces: 23518253 · 23524280 · 23523996 · E23523998 · 23520391 · DDC 8929253. DETROIT S60 12.7L · 8-GROOVE · 34-TOOTH HELICAL GEAR?? FOR DETROIT SERIES 60 12.7L PRE-EGR ENGINES ONLY. ? WHAT’S IN THE BOX. 1 × Accessory Drive Assembly (8-Groove Serpentine · 34-Tooth Helical Gear)? 1 × O-Ring (DDC 8929253). 24H Dispatch · 2-4 Days. ? ORDER NOW – KEEP ON TRUCKIN’?? INSTALLATION NOTE: Professional installation recommended. ? FOR DETROIT SERIES 60 12.7L PRE-EGR ENGINES ONLY – NOT for 14.0L or 2005+ EGR engines. This is an 8-Groove Serpentine / 34-Tooth Helical Gear accessory drive. Verify the drive gear tooth count and serpentine belt groove count match your original assembly. Clean all mating surfaces and replace the O-ring before installation. Torque all bolts to Detroit Diesel specifications. Send us your engine serial number or VIN before ordering, and our team will verify fitment within 24 hours. ? Aftermarket part · Not OEM ·. Compatible with Detroit Series 60 12.7L PRE-EGR Engines ONLY. NOT compatible with 14.0L · 2005+ EGR · Other engine platforms.