MX-5 Miata L4-2.0L (2008)
Crankshaft Main Bearing: Specifications
Main bearing
Main bearing size
STD: ........................................................................................................................................................................ 2.506-2.509 mm (0.0987-0.0988 in)
OSO.25: .................................................................................................................................................................... 2.628-2.634 mm (0.1034-0.1037 in)
Main Bearing Cap Assembly Note
1. Install the main bearing caps in the order indicated in the figure.
2. Tighten the main bearing cap bolts using the SST (49 D032 316).
Tightening torque
Plastic region tightening bolt
(Bolt stem length 110 mm)
Standard: ..................................................................................................................................................................................... 110.0-110.6 (4.33-4.35)
Maximum: ..................................................................................................................................................................................................... 111.3 (4.38)
(1) ........................................................................................................................................................... 44 46 N-m (4.5-4.6 kgf-m, 32.5-33.9 ft-lbt)
(2) ............................................................................................................................................................................................................... 175°-185°
Elastic region tightening bolt
(Bolt stem length 104 mm)
(1) Apply engine oil to all bolts.
(2) ....................................................................................................................................................... 3-7 N-m (30.6-71.3 kgf-cm, 26.6-61.9 in-lbt)
(3) ............................................................................................................................................................ 23-27 N-m (2.4-2.7 kgf-m, 17-19.9 ft-lbt)
(4) ......................................................................................................................................................... 38-42 N-m (3.9-4.2 kgf-m, 28.1-30.9 ft-lbt)
(5) Loosen all the bolts. (no remaining torque.)
(6) ....................................................................................................................................................... 3-7 N-m (30.6-71.3 kgf-cm, 26.6-61.9 in-lbt)
(7) ......................................................................................................................................................... 18-22 N-m (1.9-2.2 kgf-m, 13.3-16.2 ft-lbt)
(8) ............................................................................................................................................................................................................ 87.5°-92.5°
Crankshaft
Crankshaft end play (Standard) ..................................................................................................................................... 0.22-0.45 mm (0.0087-0.0177 in)
Crankshaft end play (Maximum) ....................................................................................................................................................... 0.55 mm (0.0216 in)
Crankshaft runout (Maximum) ...................................................................................................................................................... H 0.05 mm (0.0019 in)
Main journal bearing size
STD: .................................................................................................................................................................... 51.980-52.000 mm (2.0464-2.0472 in)
USO.25: ............................................................................................................................................................... 51.730-51.750 mm (2.0366-2.0373 in)
Main journal out of round
(Maximum) ........................................................................................................................................................................................ 0.05 mm (0.0019 in)
Crank pin journal diameter [LF]
