If the alternator belt on your Bukhanka squeals, wears on one edge, or slowly walks off the pulley, the problem is almost never the belt itself. In most cases the pulleys are simply not running in the same plane. Even a few millimetres of misalignment between crankshaft, water pump, and alternator is enough to destroy belts and drive you crazy.
Why Belts Misbehave on a Bukhanka
The front accessory drive on a UAZ is simple, but it is not very tolerant of small errors. Over the years many vans receive replacement alternators, different pulleys, or mixed brackets. Each small change can shift the belt line just enough to cause noise or uneven wear.
When the belt does not run straight, it tries to climb the edge of the pulley. That shows up as squealing on start-up, glazing, or frayed edges. Tightening the belt harder only hides the symptom for a short time and often kills bearings instead.
The Usual Causes
| Cause | What You See | Why It Happens |
|---|---|---|
| Pulley plane offset | Belt rides to one side or walks off | One pulley sits a few mm in or out |
| Mixed components | Rapid edge wear after upgrades | Different alternator or pulley stack height |
| Incorrect tension | Squeal or glazed belt | Too loose or overtightened adjustment |
Fast Alignment Check
You do not need special tools to diagnose this. A straightedge or flat bar is enough. Hold it across the face of the water pump pulley and sight along to the crankshaft and alternator pulleys. All grooves should sit in one flat plane. If one pulley sits noticeably forward or backward, that is your problem.
Measure the offset. Even two or three millimetres matters on a V-belt drive.
How to Correct the Alignment
Shim the alternator. If the alternator pulley is out of line, add or remove washers between the alternator bracket and the mounting ear. This is often the quickest fix.
Shim the pulley. If the pulley itself is the odd one out, install a thin spacer ring on the hub behind the pulley. Typical corrections are in the range of 3 to 5 mm.
Square the brackets. Bent or mismatched brackets can pull the alternator out of plane even when tightened. Make sure everything seats flat before final torque.
After shimming, spin the belt by hand and watch how it tracks. Once running, the belt should sit calmly in the centre of the pulley without trying to climb either edge.
Setting the Correct Belt Tension
Alignment comes first. Only then should you set belt tension. A properly aligned belt can run relatively loose and still stay quiet.
With moderate finger pressure at the midpoint between pulleys, a correctly tensioned V-belt should deflect visibly without feeling soft. Too loose will squeal and glaze. Too tight will overload alternator and pump bearings. After your first short drive, always re-check tension. New belts bed in quickly.
Understanding Wear Patterns
| Wear Pattern | What It Tells You | What to Fix |
|---|---|---|
| Shiny, glazed surface | Belt slipping | Clean pulleys and set correct tension |
| One edge frayed | Pulleys not aligned | Add or remove spacers until centred |
| Belt walks off at speed | Severe misalignment | Re-check pulley planes and hardware |
Quick Spacer Fix
Once you know which pulley is out of line, the fix is usually quick. Remove the pulley or alternator, install a spacer of the measured thickness, refit everything, and check again with the straightedge. When done correctly, the belt will run straight immediately, even at idle.
Final Advice
On a Bukhanka, belt problems are almost always geometry problems. Resist the urge to overtighten or keep swapping belts. Take ten minutes to check alignment properly and correct it with simple shims. Once the pulleys run true, the noise disappears, belt life improves dramatically, and the front of the engine becomes something you no longer have to think about on every drive.