Parts for your 1991 Suzuki Jimny-Drive belt tensioner

1991 Suzuki Jimny drive-belt tensioner — is it fitted, and what owners should service instead

The 1991 Suzuki Jimny doesn’t use a separate, spring-loaded drive-belt tensioner like later serpentine-belt setups. On these models (SJ413/Sierra in AU/NZ and JA11 in Japan), belt tension is set the old-fashioned way: by moving the alternator on its slotted bracket, and—if fitted—adjusting the power-steering pump or the air-con idler. Technical sources that outline this include the Suzuki SJ413/Samurai factory service manuals (covering late-’80s through early ’90s), the JA11 Jimny service manual (early ’90s), and the Sierra parts catalogues. In all of them, belt tension is achieved via sliding brackets and lock bolts, no automatic drive-belt tensioner is listed or illustrated for 1991 Jimny variants.

Why no drive-belt tensioner on a 1991 Jimny? Suzuki kept the engine bay simple and robust with separate V-belts rather than a single serpentine belt. That design makes an extra tensioner pulley unnecessary. It’s lighter on parts count, cheaper to maintain, and perfectly fine for the alternator, water pump, and optional accessories of the era. The alternator (and other accessories where applicable) doubles as the adjuster: loosen the pivot and lock bolts, set belt tension with a lever or the adjuster screw, and tighten everything back up.

Owners shopping for a “drive-belt tensioner” for this model are really looking at routine belt service instead. Here’s what matters more on a 1991 Jimny:

• Inspect the V-belts at every service for cracks, glazing, fraying, and squeal on start-up or when wet.
• Adjust tension via the alternator/power-steering brackets, or the A/C idler if fitted. Don’t over-tighten—too much tension can chew out bearings.
• Recheck tension after a short drive, as fresh belts can settle.
• Replace belts proactively if they’re aged, noisy, or worn, many owners do them every few years or around typical service intervals to suit use and climate.

If the vehicle has factory air-con, there’s usually an adjustable idler pulley—but it’s not an automatic tensioner. Same story for power steering on some trims: tension is set by shifting the pump’s bracket. A quick look at the engine-bay layout and the service manual’s belt diagrams will confirm there’s no separate tensioner unit to replace.

Popular questions about 1991 Suzuki Jimny drive-belt tensioner

Does a 1991 Jimny have an automatic serpentine-belt tensioner?
No. It runs individual V-belts with tension set by moving the alternator and, where fitted, the power-steering pump or A/C idler. There’s no spring-loaded tensioner pulley on these models.

How do you tension the alternator belt on a 1991 Jimny?
Under the bonnet, loosen the alternator’s pivot and lock/adjuster bolts, lever the alternator away from the engine to achieve firm belt tension (not guitar-string tight), then tighten the bolts. Start the engine, listen for squeal, and recheck tension after a short drive.

What belts should be checked or replaced on a 1991 Jimny?
Typically the alternator/water pump belt, plus power-steering and A/C belts if fitted. Inspect at each service and replace if cracked, glazed, noisy, or aged. Always recheck tension after fitting new belts.