21676635 20747516 Idler Pulley for Volvo Penta TAD1242GE TWD1240VE TAD1251VE

Product Overview

This idler pulley maintains proper belt tension and guides the serpentine or accessory drive belt on Volvo Penta marine and industrial diesel engines. Designed as a direct replacement for part numbers 21676635 and 20747516, this idler pulley ensures reliable operation of the alternator, water pump, and other belt-driven components. It is a critical component for maintaining engine timing and accessory drive performance.

Key Features & Performance

• Precision bearing for smooth rotation and long service life
• Hardened steel or composite pulley surface to resist wear
• Direct bolt-on replacement for Volvo Penta TAD and TWD engine series
• Matched to OEM dimensions for correct belt alignment
• Reduces belt noise and vibration
• Includes mounting bolt and washer where applicable

Fitment & Compatibility

• Volvo Penta TAD1242GE
• Volvo Penta TWD1240VE
• Volvo Penta TAD1251VE

Common Uses

• Replacement of worn or noisy idler pulleys on Volvo Penta marine engines
• Service during serpentine belt replacement on TAD and TWD series
• Maintenance of generator set engines using Volvo Penta TAD1242GE
• Repair of accessory drive systems in industrial and marine applications

Technical Specifications

• Part Number(s): 21676635, 20747516
• Type: Idler Pulley (non-tensioner)
• Bearing Type: Sealed ball bearing
• Outer Diameter: OEM specification

Frequently Asked Questions

Q: Is this idler pulley the same as a belt tensioner pulley? A: No, this is a fixed idler pulley that guides the belt and does not have a spring-loaded tensioning mechanism. It works in conjunction with a separate belt tensioner.

Q: Can I use this pulley on a Volvo Penta TAD1251VE? A: Yes, it is specifically listed as compatible with the TAD1251VE engine model.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.