Mazda MX-5 1990 Workshop Manual page 789

TECHNICAL DATA
TO
Item
Engine
86 DOHC
Seat contact width mm (in) 0.8-1.4 (0.031-0.055)
Seat sinking mm (in)
Standard 43.5 (1.713)
Maximum 45.0 (1.772)
Valve spring
IN
Standard 48.0 (1.890)
Minimum 47.0 (1.850)
Free length mm (in)
Standard
48.3 (1.902)
EX
Minimum 47.3 (1.862)
Out-of-square mm (in)
IN
1.68 (0.0661) max.
EX 1.69 (0.0665) max.
Setting load/height N (kg, Ib)/mm (in)
IN
217 -246 (22.1-25.1, 48.6-55.2)/40.0 (1.575)
EX 174-196 (17.7-20.0, 38.9-44.0)/40.0 (1.575)
Camshaft
IN
Standard 40.888 (1.6098)
Minimum
40.688 (1.6019)
Cam height
mm (in)
Standard 40.889 (1.6098)
EX
Minimum
40.689 (1.6019)
Standard
25.940-25.965 (1.0213-1.0222)
Journal diameter mm (in)
(No.1-No.5)
Out-ot-round 0.05 (0.002) max.
Standard
0.035-0.081 (0.0014-0.0032)
Camshaft bearing oil clearance
mm (in)
(No.1-No.5)
Maximum 0.15 (0.006)
Camshaft runout mm (in) 0.03 (0.0012) max.
Camshaft end play
mm (in)
Standard 0.07-0.19 (0.0028-0.0075)
Maximum 0.20 (0.008)
Cylinder block
Height mm (in) 221.5 (8.720)
Distortion mm (in)
0.15 (0.006) max.
Grinding mm (in) 0.20 (0.008) max.
Cylinder bore diameter
Standard size 78.006-78.013 (3.0711-3.0714)
mm (in)
0.25 (0.010) oversize 78.256-78.263 (3.0809-3.0812)
0.50 (0.020) oversize
78.506-78.513 (3.0908-3.0911)
Cylinder bore taper and out-of-round mm (in)
0.019 (0.0007) max.
Piston
Piston diameter
Standard size 77.954-77.974 (3.0690-3.0698)
Measured at 90° to pin bore
0.25 (0.010) oversize 78.211-78.217 (3.0792-3.0794)
axis and 16.5mm (0.650 in)
below oil ring groove mm (in)
0.50 (0.020) oversize 78.461-78.467 (3.0890-3.0892)
Piston-to-cylinder clearance mm (in)
Standard 0.039-0.052 (0.0015-0.0020)
Maximum
0.15 (0.006)
Piston ring
Thickness mm (in)
Top 1.47-1.49 (0.0579-0.0587)
Second 1.47-1.49 (0.0579-0.0587)
Top 0.15-0.30 (0.006-0.012)
End gap (Measured in cylinder) mm (in)
Second
0.15-0.30 (0.006-0.012)
Oil (rail)
0.20-0.70 (0.008-0.028)
Maximum 1.0 (0.039)
Top 1.52-1.54 (0.0598-0.0606)
Ring groove width in piston mm (in)
Second 1.52-1.54 (0.0598-0.0606)
Oil
4.02-4.04 (0.1583-0.1591)
Piston ring-to-ring groove clearance
Top 0.03-0.07 (0.0012-0.0028)
mm (in)
Second
0.03-0.07 (0.0012-0.0028)
Maximum 0.15 (0.006)
Piston pin
Diameter mm (in) 19.987-19.993 (0.7869-0.7871)
Piston-to-piston pin clearance mm (in)
-0.005-0.013 (-0.0002-0.0005)
Connecting rod bush-to-piston pin clearance mm (in)
0.010-0.027 (0.0004-0.0011)
TO-3
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