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)
Estimated Reading Time: 3 Minutes#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 |
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Brand: |
Model: |
Model Year: |
VIN Breakpoint |
Engine: |
Transmission: | ||
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Chevrolet |
Corvette |
2014 |
2019 |
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6.2L (LT1, LT4) |
6L80 Automatic (MYC), 8L90 Automatic (M5U) or Manual |
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Involved Region or Country |
North America, Europe, Russia, Middle East, Japan, Thailand |
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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.
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Cause |
This condition may be caused by excessive crankshaft endplay associated with a damaged thrust bearing.
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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.
Example of a good thrust bearing face.
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Service Procedure
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Important: Follow the service procedures outlined in Service Bulletin 18-NA-268 for DSA inspection and possible repair.
- 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.
- Start with removing the middle thrust main bearing cap.
- 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.
- 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.
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Parts Information
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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
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Version |
3 |
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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. |