Parts for your 1986 Suzuki Jimny-Drive belt tensioner

1986 Suzuki Jimny drive-belt tensioner — is it actually used?

Short answer: no, a separate automatic drive-belt tensioner isn’t used on the 1986 Suzuki Jimny (also sold as the Sierra/SJ413). On this model, belt tension is set manually by shifting the alternator (and, if fitted, the A/C idler or power-steering pump) along a slotted bracket. This layout is documented in factory and aftermarket references: Suzuki SJ413/Samurai Service Manual (Engine: Fan/Generator belt section, 1986), Gregory’s Suzuki Sierra 1982–1994 Service and Repair Manual No. 507 (Drive belts chapter), and the Suzuki SJ410/SJ413 Parts Catalogue (Pulley/Belt illustrations), all of which show no spring-loaded tensioner assembly.

Why it’s not used comes down to the era and belt design. The 1986 Jimny runs individual V-belts rather than a single serpentine belt. V-belts were commonly tensioned by pivoting the alternator or an accessory on a slotted bracket. Automatic tensioners became common later with multi-rib serpentine belts on newer generations. So, asking for a “drive-belt tensioner” on this vintage Jimny generally means the required parts are belts, alternator bracket hardware, or an A/C idler pulley if the vehicle has air-con.

For servicing, the focus is on belt condition and correct manual adjustment rather than replacing a tensioner that doesn’t exist. A mechanic loosens the alternator pivot and adjuster bolts, moves the alternator to achieve the workshop manual’s specified tension, then re-tightens the hardware. The A/C belt (where fitted) is tensioned by its adjustable idler, power steering (if equipped) is set by moving the pump. Later re-checks are smart because fresh belts can bed in and lose a touch of tension over the first few hundred kilometres.

• What to watch for: belt squeal on start-up, dimming lights at idle, cracking or glazing on the belt ribs, or steering/A/C slip on optioned vehicles.
• Good practice: inspect belts at each service, adjust if there’s excessive deflection, and replace if frayed, glazed, or age-hardened. Always re-tension after a short run-in.
• Parts you’ll actually need: correct-length V-belts, alternator bracket bolts/washers, and an A/C idler pulley only if the vehicle has air-con.

Technical sources referenced: Suzuki SJ413/Samurai Service Manual (1986, Engine – Fan and Generator Belt), Gregory’s Suzuki Sierra 1982–1994 Manual No. 507 (Drive Belts), Suzuki SJ410/SJ413 Parts Catalogue (Pulley/Belt group). These show manual adjustment via alternator and accessory brackets, with no automatic drive-belt tensioner assembly fitted.

Popular questions

Where is belt tension adjusted on a 1986 Jimny?
It’s set at the alternator. Loosen the alternator pivot and adjuster bolts, swing the alternator to get the correct belt tension per the manual, then tighten. If the vehicle has air-con, the A/C belt is set via an adjustable idler pulley.

Does a 1986 Jimny use a serpentine belt?
No. It uses individual V-belts. That’s why there’s no spring-loaded tensioner, each belt is tensioned by moving the alternator or the relevant accessory bracket.

How often should belt tension be checked?
Check at regular services and after any belt replacement. If there’s squeal on cold start, dim lights at idle, or visible belt wear, check and adjust straight away.