BMW E31 M62 V8 Pulley & Serpentine Belt Replacement – Fix That Rattling Noise!

Hey everyone, Tim here! Last weekend I noticed my E31’s M62 V8 engine sounded off — rumbling, hissing, and generally nasty noises. I thought it might be the timing chain guides, but it turned out to be a faulty tensioner pulley! In this video, I take you step-by-step through diagnosing the noise and replacing the tensioner pulley and serpentine belt. I’ll also show the best way to remove the viscous fan, radiator shroud, and expansion tank without making a mess. If your E31, E38, or even E39 is making similar rattling noises, this guide will save you time, frustration, and guesswork. Give it a thumbs up if it helps, leave your questions in the comments, and don’t forget to subscribe for more BMW repairs and tips! 0:00 – Introduction & Engine Noise Diagnosis 🔊 1:15 – Checking Timing Chain Guides vs. Pulleys ⚙️ 2:30 – Locating the Faulty Tensioner Pulley 🕵️‍♂️ 4:00 – Removing the Viscous Coupled Fan 🔧 6:30 – Removing Radiator Shroud & Covers 🛡️ 8:50 – Accessing Expansion Tank & Bleed Lines 💧 11:10 – Removing Tensioner Pulley Bolts & Damper Assembly 🌀 14:30 – Taking Out the Old Pulley & Cleaning Parts 🧼 16:50 – Installing New Tensioner Pulley & Damper Assembly ✅ 19:40 – Refitting Serpentine Belt & Checking Alignment 🔄 21:50 – Reassembling Shrouds, Expansion Tank & Sensors 🏗️ 24:00 – Final Check & Engine Start 🔥 25:20 – Closing Remarks & Tips 👍