Automatic Serpentine Belt Tensioner for Infiniti/Nissan V6 ⚙️

This unit keeps the drive belt tight and aligned so your alternator, water pump, power steering, and A/C run smoothly. It is an OE-style fit for popular Infiniti/Nissan V6 layouts (VQ-series). A healthy tensioner prevents belt slip, noise, and premature belt wear.

Why you need it

The drive belt stretches and relaxes as loads change. Without constant tension, the belt slips, squeals, and can jump grooves. This part applies precise force to the belt automatically, maintaining correct grip in all conditions. Result: stable charging, cool engine, reliable steering, and cold A/C ❄️.

How it works

A heavy-duty spring pushes a pivot arm with a pulley against the belt. A friction damper controls arm movement to stop belt flutter. The sealed bearing pulley spins at high speed with minimal drag, keeping tension steady across the alternator, pump, and compressor.

What happens if it fails

Signs include chirp/squeal, rattling arm, pulley wobble, frayed or glazed belt, battery light, rising temp gauge, heavy steering, and weak A/C. In severe cases the belt can come off, causing immediate overheating and no charging ⚠️.

Tech tips for install

Confirm belt routing, rotate the arm with the proper tool, and torque the mount bolt to spec. Spin the pulley by hand; it should be smooth and quiet. Replace a cracked or oil-soaked belt at the same time for best results.

Built for long life

Cast aluminum arm, corrosion-resistant finish, OE-rate spring, tuned damper, and a high-temp sealed bearing pulley. Designed for quiet operation and stable tension across wide RPM ranges.

Compatibility

• Q70/M
• Qx50/Ex
• Q60/G Coupe
• Q60/G Convertible
• Q40/G Sedan
• Q50
• Q70(201802-)Lam
• Qx70/Fx
• G37 Sedan
• M