1993 GMC Suburban Owner's Manual - Page 356

Scheduied Maintenance Serwkes Below are explanations of the services listed in the maintenance charts. Theproperfluidsandlubricants to usearelisted in thissection.Makesure whoeverservicesyourvehicleusesthese. All partsshouldbereplacedand allnecessaryrepairsdonebeforeyouoranyoneelsedrivesthevehicle. 1. ENGINEOIL AND OIL FILTER CHANGE* -ALWAYSUSESGOR SG/CE QUALITY, ENERGYCONSERVING II OILS OF THE PROPER VISCOSITY. To determinethepreferredviscosityoilforyourvehicle's engine(e.9. SAE 5W-30 or 10W-30), see"Engine Oil" in theIndex. 2. CHASSIS LUBRICATION -Lubricatethefrontsuspension, king pin bushings,steeringlinkage,transmission,andtransfercaseshiftlinkage, parkingbrakecableguides,propshaftsplines (2 wheeldrive),brake pedalsprings,andclutchpedalspringsattheintervalsspecified. If youhavea 3500 HD, lubricatethekingpinsandkingpinbushings every 1,500 miles (2500 km)forMaintenanceSchedule 1, or every 3,000 (5000 km)forMaintenanceSchedule 2. Balljointsandkingpinbushingsshouldnotbelubricatedunlesstheir cold, let temperatureis 10°F (-12"C), orhigher.Whentheweatheris or theycouldbedamaged. themwarmupbeforelubrication Also, besuretocheck allthevehiclefluidlevelsatthistime. 3. CLUTCH FORK BALLSTUDLUBRICATION -Lubricatetheclutchfork ballstudthroughthefittingontheclutchhousing.Lubricantmustbe added "sparingly"tothefitting, as only. 0066 Ib. (.003 kg)isrequired to Do notaddlubricantmoreoftenthanthe lubricatetheballstudsurface. TOO muck lubricant will damage intervalsintheMaintenanceCharts. the clutch assembly. 4. ENGINE IDLE SPEED ADJUSTMENT (DIESEL. ENGINE§)* -Adjust to thespecificationsshownontheunderhoodlabel. calibrated test equipment. Youmustuse 5. COOLING SYSTEM SERVICE* -Drain,flushandrefillsystemwithnew coolant.See"EngineCoolant" in theIndexforthepropercoolantand mixture to useinyourvehicle. Also inspectthehosesandreplacethem if theyarecracked,swollen,or deteriorated.Tighten all hoseclamps(exceptconstanttensionclamps). Removedebrisandcleantheoutsideoftheradiatorandairconditioning condenser.Washtheradiatorneck. To ensureproperoperation,pressure testtheradiatorandcap. * AnEmissionControlService 7-1 8