Lincoln Corsair Manuals

Lincoln Corsair: Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - A Clutch

Lincoln Corsair 2020-2024 Service Manual / Powertrain / Automatic Transmission / Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - A Clutch

Principles of Operation

For A clutch operation,
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).


  A clutch


Condition Possible Sources Action
A clutch does not apply SSA is mechanically stuck off INSTALL a new solenoid.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
A clutch control valve stuck off DISASSEMBLE, CLEAN and INSPECT the clutch control valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A CL CONTR, hydraulic circuit blocked/leaking DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A clutch piston seals INSPECT the components for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A clutch hub / Output sun gear INSPECT the components for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
Main control to SOWC seal missing/blocked/restricted/damaged. INSPECT the components for wear and damage. INSTALL new components as necessary.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
A clutch friction plates INSPECT the components for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A clutch always applied SSA mechanically stuck INSTALL a new solenoid.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
A clutch control valve stuck on DISASSEMBLE, CLEAN and INSPECT the clutch control valve. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
A CL CONTR, hydraulic circuit cross leaks DISASSEMBLE and INSPECT the main control valve body and separator plate passages for leaks or damage. INSTALL new components as necessary.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
Main control to SOWC seal blocked/restricted. INSPECT the seal for damage/debris. CLEAN and/or INSTALL new components necessary.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
A clutch friction plates INSPECT the components for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A clutch delayed/soft/slipping apply Incorrect transmission strategy programmed into PCM / TCM . PERFORM the Transmission Strategy Download,
REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
Low line pressure PERFORM line pressure test.
REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
SSA mechanically sticking INSTALL a new solenoid.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
A clutch control valve sticking DISASSEMBLE, CLEAN and INSPECT the valves. If bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A CL CONTR, hydraulic circuits blocked/leaking DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
Main control to SOWC seal missing/blocked/restricted/damaged. INSPECT the seal. CLEAN and/or INSTALL new components necessary.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
A clutch piston seals INSPECT the components for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A clutch friction plates INSPECT the components for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A clutch harsh apply Incorrect transmission strategy programmed into PCM / TCM . PERFORM the Transmission Strategy Download,
REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
High line pressure PERFORM the line pressure test.
REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
SSA mechanically sticking INSTALL a new solenoid.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
A clutch control valve sticking DISASSEMBLE, CLEAN and INSPECT the valves. If the bore or valve is damaged, INSTALL a new main control valve body.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A CL CONTR hydraulic circuit blocked/leaking DISASSEMBLE and INSPECT the main control valve body and separator plate passages for leaks or damage. INSTALL new components as necessary.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
Main control to SOWC seal missing/blocked/restricted/damaged. INSPECT the seal. CLEAN and/or INSTALL new components necessary.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
A clutch friction plates INSPECT the components for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
A clutch piston return springs INSPECT the components for wear and damage. INSTALL new components as necessary.
REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

    Diagnosis and Testing - Special Testing Procedures

    Principles of Operation Line Pressure Test This test verifies the line pressure is within specification. Remove the air cleaner.REFER to: Air Cleaner (303-12B Intake Air Distribution and Filtering - 2...

    Diagnosis and Testing - B Clutch

    For B clutch operation, REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).   B clutch Condition Possible Sources Action B clutch does not apply SSB is mechanically stuck off INSTALL a new solenoid...

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