Specifications & Procedures
On 4.0L engine, automatic belt tensioner is a spring loaded arm and pulley assembly. See Fig 1. Tensioner assembly is bolted to generator mounting bracket. Tensioner assembly is designed to apply constant pressure on drive belt to maintain proper belt tension. There are 3 marks on the tensioner body. These marks are there to indicate belt wear and belt tension.
NOTE:
On 4.0L engine, tensioner arm has 3 marks. Upon installation of NEW belt, indicator mark must be between minimum and maximum marks. Belt should be replaced if indicator mark is not as specified. See Fig 1.
BELT ADJUSTMENT - (Tension In Lbs. (kg) Using Belt Tension Gauge)
| Application | Tension - Lbs. (kg) | |||
|---|---|---|---|---|
| Serpentine Belt | ||||
| New Belt (1) | 180-200 (81.64-90.72) | |||
| Used Belt | 140-160 (63.50-72.57) | |||
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