Engine Flywheel Housing Requirements and Fault Code 250

Date: May 17, 2021

Updated: October 24, 2023

Issue Description:

Customers may experience Transmission Control Module (TCM) fault codes and transmission performance complaints after replacing the engine, engine flywheel housing, clutch, transmission, or the engine flywheel was resurfaced.

TCM may report fault codes:

The Endurant Transmission requires a specific engine flywheel housing to ensure the correct Split Dimension. The Split Dimension is the distance from the engine flywheel machined surface to the engine flywheel housing where the transmission clutch housing attaches. See Cummins TSB190160.

• Eaton and ECJV recommend referencing the OEM and/or engine manufacturers procedures for flywheel reuse criteria. This notice was added to the clutch installation procedure (CLMT4309 EN-US) August 2022 and the Endurant Service Manual (TRSM0960) September 2023:
  Caution

  Follow all OEM and/or engine manufacturer flywheel inspection and machining procedures. Failure to follow OEM and/or engine manufacturer flywheel procedures may result in the Clutch Cover not properly attaching or seating to the flywheel, causing:
• Fault Code 250 to set Active - “CC” in display and may not complete a Clutch Calibration
  • Endurant XD Service Manual received the same statement October 2023.
  • Cummins and Detroit Diesel have published guidelines for resurfacing flywheels, see attached service bulletins.
• A caution was added to the Clutch Service Procedure to the Endurant Family Service Manuals TRSM0950 / TRSM0960 September 2022.
  • SAE J617 #1 flywheel housing minimum requirement (Transmission to Engine Flywheel Housing) is 12 fasteners. Endurant was launched with 16 fasteners (PACCAR required 4 additional fasteners). Some customers (DTNA / VOLVO)may notice “Missing” fasteners. Cummins released an SAE Split difference flywheel housing (12 holes) while the Endurant clutch housing remained at 16 fastener hole capacity. The SAE for a #1 flywheel housing minimum requirement is 12 fasteners.

Not Required (Transmission housing has additional holes at 1, 5, 7, and 11 o’clock)

Affected Models/Population:

• Endurant HD / XD Transmissions
• PACCAR Transmissions

Field Strategy:

• If the engine or engine flywheel housing requires replacement, contact the OEM and/or engine manufacturer to identify the engine flywheel housing part number based on the transmission model.
• To verify the correct engine flywheel housing is installed, measure the Split Dimension, and reference the chart below. See Cummins TSB190160 attached in 2019-FSUD-2774.
• Fault Code 250 may also be set if the incorrect clutch release bearing is installed. Reference TRSM0950 for release bearing dimensions.
• Fault Code 250 may also be set if a replacement transmission has the incorrect input shaft dimension. Reference TRSM0950 for input shaft dimensions and service transmission identification.
• Fault Code 250 may also set if a flywheel was just machined.
  • Eaton and ECJV recommends referencing the OEM and/or engine manufacturers procedures for flywheel reuse criteria
  • Clutch cover may not fully seat or properly attach to the flywheel. Refer to the OEM and/or engine manufacturer.

Note: *PACCAR Transmission

Note: Reference TRSM0950 Endurant Service Manual for the latest Endurant HD Service Manual link and OEM specific service parts.

Warranty Information:

Informational only.

FSUD: 2774

The material contained in this bulletin is product improvement information. Eaton Corporation is not committed to, or liable for, canvassing existing products.