Inspection and Adjustments of the Engine Compartment
Important: If replacement of the hood or bumper is necessary, the replacement component must meet or exceed the drag reduction performance of the originally installed item in order to maintain compliance with greenhouse gas and fuel efficiency regulations.
- Inspect the bumper and hood for structural damage, cracks, or wear.
- Check the hydraulic clutch reservoir, if equipped. If necessary, add DOT 4 brake fluid.
- Inspect the radiator and heater hoses, including the clamps
and support brackets.
- Inspect the radiator and charge air cooler for damage and accumulated debris. Straighten bent or damaged fins to permit airflow across all areas of the cores.
- Make sure the radiator inlet and outlet hoses are pliable and are not cracking or ballooning.
- Make sure the heater hoses are pliable and are not cracking or ballooning.
- Tighten hose clamps as necessary.
- Ensure hose support brackets are securely fastened. Make sure hoses are not located near sources of wear, abrasion, or high heat.
Note: When traveling through areas of high insect concentration, it may be necessary to clean the exterior of the radiator or the charge air cooler core as often as every 200 miles (320 km).
Important: Do not overtighten hose clamps, as hose life can be adversely affected.
- Check the steering wheel for excessive play.
- Start the engine. With the front tires straight ahead, turn the steering wheel until motion is observed at the front wheels.
- Align a reference mark on the steering wheel to a rule, then slowly turn the steering wheel in the opposite direction until motion is again detected at the wheels.
- Measure the lash (free play) at the rim of the steering wheel. Excessive lash exists if steering wheel movement exceeds 2-1/2 inches (64 mm) with a 20-inch (508-mm) steering wheel, or 2-1/4 inches (57 mm) with an 18-inch (450-mm) steering wheel.
- If there is excessive lash, check the steering system for wear or incorrect adjustment before operating the vehicle.
Important: When replacing hoses, install service-type knitted or braided yarn-reinforced neoprene hose. Extended-service-life silicone hoses may also be used. See the Alliance Parts Catalog atwww.alliancebrandparts.comor contact your Freightliner Dealer.