Miata Technical Service Bulletin
|Hard shift to 2nd gear after cold start|
Hard shifting into second gear before the vehicle has had sufficient time to warm up may be caused by insufficient clearance between 2nd gear synchronizer ring and the 1-2 clutch hub. Design changes have been made to the 2nd gear synchronizer ring and clutch hub sleeve to correct this problem since April 1, 1991.
If you experience hard shifting into 2nd gear after a cold start with an RX-7 (non-turbo) or Miata produced prior to April 1, 1991, replace the 2nd gear synchronizer ring and 1-2 clutch sleeve (or 1-2 clutch hub set) with redesigned ones. Refer to section J of the workshop manual for installation procedures.
MX-5 Miata JM1NA351*M*232720 April 1, 1991 RX-7 (Non-Turbo) JM1FC3***M0906971 April 1, 1991
|M502 17 265C||M502 17 265B||2nd Synchronizer Ring||1||New -> Old|
|M503 17 262A||M503 17 262||1-2 Clutch Hub Sleeve||1||New -> Old|
|M505 17 260B||M505 17 260A||1-2 Clutch Hub Set||1||New -> Old|
(Applies to vehicles covered under warranty.)
Warranty Type Code: A Customer Complaint Code: 99 Damage Code: 99 Part No. of Main Cause: M502 17 265C (Qty. 1) Related Parts: M503 17 262A
M505 17 260B
Miata RX-7 Operation No: J0315XRX J0315ARX Labor Hour: 5.2 Hrs. 5.1 Hrs.
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