ENGINE DIVISION SERVICE MANUAL
Fig. 38 S-Series 1723 and 1823 Bus With 52 Gallon Fuel Tank
Check Engine Bolt Torque and Tighten if Necessary.
Torque carburetor, intake manifold and exhaust manifold
mounting bolts (see Tune-Up Specifications).
Check Exhaust Gas Control Valve for free operation
and service or replace, if necessary (where used).
Inspect exhaust heat riser valve for free operation
Free up with solvent, if necessary, while turning valve
by hand (valve should turn to closed position when at
If valve cannot be freed with solvent, replace with
10. Check Coil output Voltage and replace Coil, if
Connect SE-2576, or equivalent, test equipment.
Start and operate engine until normal operating
temperatures are reached. Then, increase engine
speed to 2500 RPM.
Record coil output voltage. If coil output voltage is
Specifications), proceed as follows:
Fig. 39 Heat Riser Valve
Measure the D.C. voltage at the positive terminal of
the ignition coil with the engine at idle speed and
record. age 23
CGES-215 Page 23
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