Detroit GHG17 Heavy Duty Engine Piston Protrusion Measurement Procedure

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1.Setscrew Slot for MDEG

2.Setscrew Slot for HDEP

3.Setscrew

4.Sleeve

5.HDEP Use

6.MDEG Use

7.Tool Set for Use with HDEP

8.Setscrew

Check as follows:

1 Remove all of the injectors. Refer to section “Removal of the Fuel Injector – Two-Filter System” .

2 Set the piston protrusion tool upper collar for HDEP engines.

3 Install the piston protrusion tool into cylinder #1.

4 Install and torque the injector hold down clamp to 20 N·m (14.8 lb·ft).

5 Ensure that the dowel is at the bottom of the tool.

Note : If the dowel is not at the bottom of the tool, bar the engine over by hand until the dowel is at the bottom of the tool.

6 Set the dial indicator to zero.

7 Bar the engine over by hand while watching the dowel pin and the dial indicator. If there is no measurement on the dial indicator and the dowel pin does not rise, the dial indicator must be set further down into the tool collar.

8 Bar the engine over by hand and record the maximum height for cylinder #1.

9 Remove the piston protrusion tool and install the tool into cylinder #2.

10 Install and torque the injector hold down clamp to 20 N·m (14.8 lb·ft).

11 Ensure that the dowel is at the bottom of the tool.

12 Set the dial indicator to zero.

13 Bar the engine over and record the maximum height for cylinder #2.

14 Repeat steps 9 through 13 for the remaining cylinders. Once the measurements are recorded for each cylinder, proceed to step 15.

Note : The lower the measurement, the shorter the piston connecting rod.

15 Compare the measurements for each cylinder. A difference of 0.017 in. for HDEP engines from the highest cylinder measurement indicates that the piston is not reaching top dead center and further investigation is needed to determine the cause of the concern.

More repair cases for Detroit Diesel engines,please refer to:Detroit Diesel Engine Repair

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