Mazda MX-5 Miata Sport 2007 Manual page 554

2006-08 TRANSMISSION Automatic Transmission Overhaul - MX-5 Miata & RX-8
92. Install the accumulator valve and compression spring to the transmission case.
CAUTION:
93. Apply ATF to the new O-ring and install the accumulator pistons C.
Fig. 338: Identifying O-Ring And Accumulator Pistons C
94. Install the accumulator piston C, compression spring to the transmission case.
2007 Mazda MX-5 Miata Sport
Do not damage the O-ring and accumulator piston.
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Fig. 337: Identifying Accumulator Valve And Compression
Spring