Vauxhall Workshop Service and Repair Manuals

Checking and Adjustment Operations  

Lower and Upper Idle Speed, Check and Adjust  

  Inspect   

The rpm of the engine is measured at the pulley with the engine at operating temperature using an rpm gauge that is based on a photocell. A 1 to 2 cm wide aluminium film must be applied to the front collar of the crankshaft pulley (arrow, see illus. I). Start engine and measure lower and upper idle speed with rpm gauge.   Lower idle speed should be 830 - 930 rpm.     Adjust    If this nominal value is not attained, adjust lower idle speed as follows: Loosen lock nut and turn stop bolt (arrow, see illus. II) of engine speed adjustment lever until nominal value is attained.   After adjustment, tighten lock nut.

 

Upper idle speed (maximum engine speed without load):   15 D   5600 to 5800 rpm   15 DT/X 15 DT   5400 to 5600 rpm   17 D/X 17 D   5100 to 5300 rpm       Adjust    If nominal value is not attained, adjust upper idle speed as follows: Remove lead seal (2), loosen lock nut (1) and turn stop bolt of engine speed adjustment lever until nominal value is attained.     Important!    To prevent damage to engine, do not adjust the upper engine speed too high.     Install, Connect    After adjusting engine speed, secure stop bolt and lock nut with lead seal (2).