No.: 14 TL-7Rev
April 10, 2015

TO:

Service Locations

FROM:

Service Systems Development

SUBJECT:

DD Platform Flywheel Housing Runout Tool W470589032100

GENERAL INFORMATION
The Detroit™ special tool group has developed a runout tool to measure the bore and rear
flatness on the flywheel housing. The tool is compatible with most manual transmission
flywheels as well as the flywheel used for the Detroit™ DT12™ transmission.
TOOL USAGE INSTRUCTIONS

1.
2.
3.
4.
5.

Tightening knobs
Fixture mounts
Bore runout dial indicator
Flatness runout dial indicator
Pin Screw (MUST be used to secure flatness dial indicator)

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PERSONAL INJURY
To avoid injury from hot surfaces, wear protective gloves,
or allow engine to cool before removing any component.

Figure 1. Flywheel Housing Runout Tool
In order to measure the runout, refer to OEM instructions for the removal of the vehicle’s
transmission.
To record the measurements and determine if the runout calculations are correct, log into
DDCSN.com. Use the link below:

https://extranet-ddc.freightliner.com/FlywheelHousingRunoutCalculator/
Bore Runout is recorded in figure 3, Face Runout is recorded in figure 4.
Install and measure the flywheel housing runout as follows:
1. Install the engine barring tool (P/N: J-46392 or W904589046300).
2. Install the fixture mounts at the six o’clock position into the flywheel by matching the
respective threads.
3. Install the fixture to the mounts; hand-tighten the knobs.
Note: When installing the dial indicators, ensure the measurement stems are not bottomed out.
4. Install the bore dial indicator onto the fixture; hand-tighten the knobs.
5. Adjust the dial indicator to read zero.
6. Rotate the engine until the dial indicator reaches the 3 o’clock position.
a. Enter the value for the bore runout in the “A” box.
7. Rotate the engine until the dial indicator reaches the 12 o’clock position.
a. Enter the value for the bore runout in the “B” box.
8. Rotate the engine until the dial indicator reaches the 9 o’clock position.
a. Enter the value for the bore runout in the “C” box.
Note: If the dial indicator does not read zero, reinstall the indicator and measure the entire
flywheel housing bore again.
9. Rotate the engine until the dial indicator reaches the 6 o’clock position. Ensure dial
indicator reads zero.
10. Rotate the engine until the dial indicator reaches the 12 o’clock position.
11. Adjust the dial indicator to read zero.

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12. Using a pry bar, apply upwards pressure on the bottom of the flywheel against the inside
of the flywheel housing. See Figure 2.

Figure 2. Using Pry Bar on the Flywheel Housing
13. While pressure is applied on the flywheel, record the reading on the dial indicator in the
“D” box.
14. Remove the pry bar and ensure the dial indicator reading returns to zero.
Total Bore runout will auto populate in box “E”.

Figure 3. Bore Runout
15. Remove the dial indicator and install it to measure the face runout.
16. Rotate the engine to the 6 o’clock position.
17. Adjust the dial indicator to read zero.
18. Rotate the engine until the dial indicator reaches the 3 o’clock position.
a. Enter the value for the bore runout in the “F” box.
19. Rotate the engine until the dial indicator reaches the 12 o’clock position.
a. Enter the value for the bore runout in the “G” box.
20. Rotate the engine until the dial indicator reaches the 9 o’clock position.

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a. Enter the value for the bore runout in the “H” box.
Note: The maximum or minimum reading can also be a negative number.
21. Record the maximum indicator reading from steps 18-20 in the “I” box.
22. Record the minimum indicator reading from steps 18-20 in the “J” box.
23. Rotate the engine to the 6 o’clock position. Ensure the dial indicator reading returns to
zero.
24. Rotate the engine to the position recorded from step 22.
25. Adjust the dial indicator to read zero.
26. Rotate the engine until the dial indicator reaches the 6 o’clock position.
a. Enter the value for the bore runout in the “K” box.
27. Rotate the engine until the dial indicator reaches the 3 o’clock position.
a. Enter the value for the bore runout in the “L” box.
28. Rotate the engine until the dial indicator reaches the 12 o’clock position.
a. Enter the value for the bore runout in the “M” box.
29. Rotate the engine until the dial indicator reaches the 9 o’clock position.
a. Enter the value for the bore runout in the “N” box.
30. Record the maximum indicator reading from steps 26-29 in the “P” box.
31. If the reading in box “Q” turns red, conduct the measurements again.

Figure 4. Face Runout

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The figure below will auto-populate as the measurements are entered.

Figure 5. Bore and Face Runout Report
The Maximum runout allowable on the bore and/or face is .012” to be SAE compliant.
•

If the runout exceeds this specification, the flywheel housing must be replaced in order to
prevent damage to the pilot bearing, flywheel, or transmission.

CONTACT INFORMATION
Please contact the Detroit™ tool specialist located on DDCSN.com if you have any questions.