Drive belts
The belt tension can be checked by depressing the fan belt at a point midway between the alternator and
fan. It should be possible to press down the belt about 1/4" - 3/8" (5-10 mm). This also applies to other
drive belts on the engine.
pg. 50 Emission control system
I Engine Mechanical Components
Torque manifold nuts
The manifold nuts should be torqued at the 600-1,200 mile (1,000-2,000 km) inspection. A loose
manifold could alter air/fuel ratio and cause an increase in emission and/or poor driveability.
Valves
The valve clearance should be checked every 30,000 miles (50,000 km).
Vacuum fittings, hoses and connections
Unstable idle, misfiring or poor emission control is often caused by leaking vacuum hoses or
connections. Check hoses and connections on distributor vacuum unit, EGR valve (where applicable)
and connections on heater control servo systems and hydraulic brake servo.
Camshaft drive belt
The camshaft drive belt tensioner should be adjusted every 15,000 miles (25,000 km).
Replace the drive belt every 45,000 miles (75,000 km)
An incorrectly tensioned drive belt will impair exhaust emission as the valves will open and close
incorrectly.
II Engine Fuel System
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