2014 - 2019 Corvette: Service Bulletin: #19-NA-217: Manual Transmission Stalling, Clutch Chatter and/or Hard Shifting into 1st Gear or Reverse; Automatic Transmission Vibration on Launch and/or Engine Noise - (Dec 21, 2020)

#19-NA-217: Manual Transmission Stalling, Clutch Chatter and/or Hard Shifting into 1st Gear or Reverse; Automatic Transmission Vibration on Launch and/or Engine Noise - (Dec 21, 2020)

Subject:  Manual Transmission Stalling, Clutch Chatter and/or Hard Shifting into 1st Gear or Reverse; Automatic Transmission Vibration on Launch and/or Engine Noise

Brand:

Model:

Model Year:

VIN Breakpoint

Engine:

Transmission:

from

to

from

to

Chevrolet

Corvette

2014

2019

—

—

6.2L (LT1, LT4)

6L80 Automatic (MYC), 8L90 Automatic (M5U) or Manual

 

Involved Region or Country

North America, Europe, Russia, Middle East, Japan, Thailand

Condition

Important: If the vehicle came in with a rattle noise coming from the front of the vehicle when the engine is running at slower engine speeds and no other concerns, refer to Service Bulletin 18-NA-268.

Some customers may comment on any of the following conditions:

Note: On Automatic Transmission equipped vehicles, this may also happen after the driveline was replaced for another reason.

  • For Manual Transmission equipped vehicles:
    • Stalling
    • Clutch chatter
    • Hard shifting into 1st gear or Reverse

  • For Automatic Transmission equipped vehicles:
    • Vibration on takeoff
    • Clunk noise

Cause

This condition may be caused by excessive crankshaft endplay associated with a damaged thrust bearing.

  • Please use following information before considering an engine or crankshaft replacement.

Correction

If a vehicle comes in with the conditions listed above, refer to the Service Procedure below.

Note: Complete the SI diagnostics and the Cost Comparison Worksheet for Assembly Repair vs Replacement to determine if the engine requires a repair or replacement. DO NOT the replace engine assembly for this concern. Only replace the engine assembly if other damage is found.

2014 - 2019 Corvette: Service Bulletin: #19-NA-217: Manual Transmission Stalling, Clutch Chatter and/or Hard Shifting into 1st Gear or Reverse; Automatic Transmission Vibration on Launch and/or Engine Noise - (Dec 21, 2020)
 

Example of a good thrust bearing face.

Service Procedure

Important: Follow the service procedures outlined in Service Bulletin 18-NA-268 for DSA inspection and possible repair.

    1. Validate the crankshaft endplay is within specification (0.0015-0.0086 (0.040-0.220 mm).
  • Start with removing the middle thrust main bearing cap.
    • 2014 - 2019 Corvette: Service Bulletin: #19-NA-217: Manual Transmission Stalling, Clutch Chatter and/or Hard Shifting into 1st Gear or Reverse; Automatic Transmission Vibration on Launch and/or Engine Noise - (Dec 21, 2020)
     

      1. Inspect the thrust bearing for wear on one side and crankshaft on the corresponding mating surface. The graphic above shows an example of a damaged thrust bearing.

    Note: It is not necessary to replace the engine assembly for this condition.

  • Refer to Crankshaft and Bearing Removal in SI.

    • If bearing damage is found and if the vehicle is equipped with a dry sump system, it will be necessary to replace the oil tank with lines and oil cooler.

    Parts Information

    Causal Part

    Description

    Part Number

    Qty

    X

    CRANKSHAFT (LT1)

    12674745 (EXC Z52)

    1

    X

    CRANKSHAFT (LT1)

    12674744 (Z52)

    1

    X

    CRANKSHAFT (LT4)

    12674743

    1

    N/A

    BOLT, CR/SHF BRG CAP (M10X2X96) (LT1/LT4)

    11548076

    10

    N/A

    BOLT, CR/SHF BRG CAP (M10X2X82) (LT1/LT4)

    11548075

    10

    N/A

    BOLT, CR/SHF BRG CAP (M8X1.25X25 HEX FLANGE) (LT1/LT4)

    11546565

    10

    N/A

    SEAL, CR/SHF FRT OIL (LT1/LT4)

    12693255

    1

    N/A

    SEAL, CR/SHF RR OIL (LT1/LT4)

    89060436

    1

    N/A

    BEARING KIT, CR/SHF (LT1/LT4)

    12656814

    1

    N/A

    BEARING KIT, CONN ROD (LT1/LT4)

    12683811

    1

    N/A

    BEARING, CLU/PILOT (Manual Transmission Only) (LT1/LT4)

    12557583

    1

    N/A

    TNK, ENG OIL (LT1/LT4 Dry Sump Only Z52)

    12680701

    1

    N/A

    HOSE, AUX ENG OIL TK INL

    23299434

    1

    N/A

    HOSE, AUX ENG OIL TK OTLT

    23299435

    1

    N/A

    BOLT, A/TRANS FLEX PLT (M11X1.5X19) (LT1/LT4)

    11547118

    8

    N/A

    OIL, Engine

    Refer to EPC

    N/A

    FILTER, OIL

     

    Version

    3

    Modified

    Released February 4, 2020

    March 24, 2020 – Added CRANKSHAFT (LT1) 12674744 (Z52) to the Parts Information section and corrected P/N 11547188 to 11547118.

    December 21, 2020 – Updated some quantities in the Parts Information section.

     


    Article ID: 1480
    Created: December 22, 2020
    Last Updated: December 22, 2020

    Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/2014-2019-corvette-service-bulletin-19-na-217-manual-transmission-stalling-clutch-chatter-and-or-hard-shifting-into-1st-gear-or-reverse;-automatic-transmission-vibration-on-launch-and-or-engine-noise-dec-21-2020-1480.html