Mazda MX-5 NA silhouetteMX-5 NA

ASSEMBLY

B-63prose procedure
Continued from B-62

Piston ring end gap positioning

  1. 5
    Position the end gaps of the rings as shown in the figure.
    Top view diagram of piston showing the correct end-gap positions for the piston rings. Callouts: 'OIL RING UPPER RAIL', 'TOP RING', 'OIL RING SPACER', 'PISTON PIN' (with 30°/30° angles from piston pin axis), 'OIL RING LOWER RAIL', 'SECOND RING'. The gaps are spaced around the circumference to prevent blow-by.
    05U0BX-182

Oil Jet

Oil jet installation

  1. 1
    Install the oil jets.
    Cylinder block side view with oil jets being installed at the bottom of each cylinder bore.
    05U0BX-183
Tightening torque (oil jet)
12 - 18N·m

Crankshaft

Crankshaft installation

  1. 1
    Before installing the crankshaft, inspect the main bearing oil clearances as follows.

Oil clearance inspection

Main bearing oil clearance

  1. 1
    Remove all foreign material and oil from the journals and bearings.
  2. 2
    Install the upper main bearings and thrust bearings.
    Install the grooved upper main bearings in the cylinder block.
    Install the thrust bearings with the oil groove facing the crankshaft.
    Cylinder block bottom view showing the main bearing saddles and thrust bearing locations where upper main bearings and thrust bearings are installed.
    05U0BX-184
  3. 3
    Set the crankshaft in the cylinder block.
  4. 4
    Position Plastigage atop the journals in the axial direction.
    Do not rotate the crankshaft when measuring the oil clearances.
    Crankshaft installed in the cylinder block with Plastigage strips positioned atop each main journal in the axial direction. Label 'PLASTIGAGE' points to the strip.
    05U0BX-185
  5. 5
    Install the lower main bearings and the main bearing caps according to the cap number and ⇔ mark.
    Bottom view of main bearing caps installed showing the tightening sequence numbered 1 through 10 in two/three step pattern. Numbers (6), (4), (2), (3), (5), (7) shown on the upper row of cap bolts and (9), (1), (8), (10) etc. on the lower row indicating cross-pattern tightening order.
    05U0BX-186
  6. 6
    Tighten the main bearing cap bolts in two or three steps in the order shown in the figure.
Tightening torque (main bearing cap bolts)
54 - 59N·m
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