NHTSA ID Number: 10173396
Manufacturer Communication Number: 19NA217
TSB/Document Date: 2020-04-06
Summary
This technical bulletin provides a service procedure to correct conditions of Manual Transmission Stalling, Clutch Chatter or Hard Shifting into 1st Gear/Reverse and Automatic Transmission Vibration on Launch or Engine Noise.
Bulletin No.:
Service Bulletin
Date:
19-NA-217
February, 2020
TECHNICAL
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:
Corvette
Model Year:
VIN Breakpoint
from
to
2014
2019
Involved Region or Country
Condition
from
to
Engine:
6.2L (LT1, LT4)
6L80 Automatic
(MYC), 8L90
Automatic (M5U)
or Manual
United States, Canada, Mexico, Europe, Russia, Middle East, Japan, Thailand
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.
Copyright 2020 General Motors
LLC. All Rights Reserved.
Page 2
February, 2020
Bulletin No.: 19-NA-217
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.
5403465
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).
⇒ If endplay is found to be out of specification,
remove the engine oil pan and inspect for
possible crankshaft thrust bearing and/or
crankshaft wear.
2. Start with removing the middle thrust main
bearing cap.
Bulletin No.: 19-NA-217
February, 2020
Page 3
5403464
3. 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.
⇒ If wear is evident (3 vertical channels worn off),
it will be necessary to replace the crankshaft,
connecting rods and main bearings.
4. 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
Description
N/A
BOLT, CR/SHF
BRG CAP
(M8X1.25X25
HEX FLANGE)
(LT1/LT4)
11546565
SEAL, CR/SHF
FRT OIL
(LT1/LT4)
12693255
N/A
89060436
N/A
BEARING KIT,
CR/SHF
(LT1/LT4)
12656814
BEARING KIT,
CONN ROD
(LT1/LT4)
12683811
N/A
N/A
Causal
Part
Description
X
CRANKSHAFT
(LT1)
X
CRANKSHAFT
(LT4)
N/A
BOLT, CR/SHF
BRG CAP
(M10X2X96)
(LT1/LT4)
11548076
BOLT, CR/SHF
BRG CAP
(M10X2X82)
(LT1/LT4)
11548075
N/A
Causal
Part
Part
Number
12674745
12674743
Qty
1
N/A
1
1
1
TNK, ENG OIL
(LT1/LT4 Dry
Sump Only Z52)
12680701
N/A
HOSE, AUX ENG
OIL TK INL
23299434
N/A
HOSE, AUX ENG
OIL TK OTLT
23299435
N/A
1
1
12557583
1
Qty
1
BEARING, CLU/
PILOT (Manual
Transmission
Only) (LT1/LT4)
1
1
Part
Number
1
1
1
Page 4
February, 2020
Causal
Part
Description
N/A
BOLT, A/TRANS
FLEX PLT
(M11X1.5X19)
(LT1/LT4)
N/A
OIL, Engine
N/A
FILTER, OIL
Part
Number
Bulletin No.: 19-NA-217
Qty
1
11547188
Refer to EPC
Warranty Information
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor
Operation
4087158*
Description
Labor Time
Replace Crankshaft,
Crankshaft Main Bearings
and Connecting Rod
Bearings
24.1 hrs
*This is a unique Labor Operation for bulletin use only.
Version
1
Modified
Released February 4, 2020
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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TSB/Document ID: 19NA217
Replacement Service Bulletin Number:
MFR Communication Date: 2020-02-04
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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