www.changlin.com.cn Charge Air Cooler Intake Manifold Pressure‐Check Install pressure gauge. Part No. ST-1273, to the fitting in the turbocharger outlet. Install another pressure gauge, Part No. ST-1273, in intake manifold. Operate the engine at rated RPM and load. Record the readings on the two gauges. If the differential pressure is greater than 21 kPa [3 psi], check the charge aircoolerfor plugging. Clean or replace if necessary. Intake Manifold Temperature‐Checking Install a temperature gauge in the intake manifold. Lock the fan drive in the ON mode to prevent erratic test results, This can be done by installing a jumper across the temperature switch or supplying shop air to the fan.
Refer to the fan drive manufacturer for lock-up procedure. NOTE: Some trucks have a manual switch that will lock on the fan. Operate the engine at rated RPM and load. Record the intake manifold temperature. Measure the ambient temperature at least 60.96 cm [2.0 feet] in front of the vehicle. The maximum temperature differential must not be greater than 7°C [45°F]. If the temperature differential is greater than 7 ° C [450 F], check the charge air cooler for dirt and debris on the fins, and clean as necessary. If the problem still exists, check the cooler for internal contamination or plugging.
To check the charge air cooler for cracked tubes or header, remove the inlet and outlet hoses from the cooler. Remove the charge air cooler. Install a cap over the outlet side of the cooler, Install a pressure gauge and a shop air supply line to the inlet side of the cooler. 122 / 149 pages