Perform the previous Stall Speed Check procedure through the “Bring the engine speed back to low idle” step then complete the following: • Quickly move the throttle to the full-open position, and start the stopwatch at the same time. • When the engine speed is 90 percent of the stall speed rpm, stop the stopwatch.… Read More »
Converter Transmission’s Stall Speed: The stall speed is the engine speed (rpm) obtained at full throttle when the converter output shaft is locked. NOTE: It is possible that the vehicle brakes will not hold an electronically controlled transmission. Do not exceed 120°C [248°F] converter oil temperature. Overheating can result and converter damage can occur. If… Read More »
Use the Single-Cylinder Cutout Test to remove individual cylinders from the engine firing cycle and to monitor a running engine while the selected cylinder is disabled. The system displays the percent load and rpm values while the cylinder is disabled. The service tool must be attached to a running engine in a non-moving vehicle to… Read More »
The automated cylinder performance test is the most thorough test of cylinder performance (versus the single- cylinder cutout test, which tests the performance if individual cylinders only). The service tool must be attached to an electronic control module (ECM) to perform the test. Follow the steps outlined in Preparing to Run the Automated Cylinder Performance… Read More »
The setup for dynamometer function is used to prepare the attached electronic control module (ECM) for advanced diagnostic tests that are run on the dynamometer. For purposes of this test, the maximum engine speed without VSS, the maximum vehicle speed in top gear, and the maximum vehicle speed in lower gear are set to their… Read More »
The engine run-in period allows the tester to detect assembly errors and to make final adjustments needed for performance that meets specifications. NOTE: The amount of time specified for the following engine run-in phases are minimums. Additional time can be used, if desired, at each phase except engine idle periods. Measurements from these indicators and… Read More »
On-Highway Applications Operate the engine at 1500 to 1800 rpm in high gear for the first 80 to 160 km [50 to 99 mi] after rebuild. NOTE: Do not idle the engine for more than 5 minutes at any one time during the first 160 km [99 mi] of operation.
Operate the vehicle in a gear that produces a road speed of 90 to 95 km/h [56 to 59 mph]. Operate the engine at 1200 rpm and 25 percent of torque peak load until the water temperature reaches 70°C [158° F]. Operate the engine at 1200 rpm and 40 percent of torque peak load for… Read More »
To monitor engine performance correctly, record the following parameters. To limit dynamometer operating time, instrument the engine or use INSITE electronic service tool to make as many checks as possible. Record the following common monitor parameters during the test. Record any additional parameters if troubleshooting a specific problem. Service Tip : For the INSITE electronic… Read More »
The performance of an engine installed in on-highway vehicles can be tested on a chassis dynamometer. NOTE: Because of drive line efficiency and engine-driven accessories, the engine horsepower when measured at the rear wheels will be reduced by approximately: • 20 percent for single-axle vehicles • 25 percent for tandem-axle vehicles • 35 percent for… Read More »