Mazda MX-5 1990 Workshop Manual page 790

TO
TECHNICAL DATA
Item
Engine
86 DOHC
Connecting rod and connecting rod bearing
Length (Center to center)
mm (in) 132.85-132.95 (5.230-5.234)
Bending
mm (in) 0.075 (0.0030)
max.l50 (1.97)
Small end bore (Bush inner diameter)
mm (in) 20.003-20.014 (0.7875-0.7880)
Big end bore
mm (in) 48.000-48.016 (1.8898-1.8904)
Big end width
mm (in)
21.838-21.890 (0.8598-0.8618)
Connecting rod side clearance
mm (in)
Standard 0.110-0.262 (0.0043-0.0103)
Maximum 0.30 (0.012)
Crankshaft
Crankshaft runout mm (in) 0.04 (0.0016) max.
Standard
Standard
49.938-49.956 (1.9661-1.9668)
size
Minimum 49.904 (1.9647)
0.25 (0.010)
Standard 49.704-49.708 (1.9568-1.9570)
Main journal diameter
undersize
Minimum 49.652 (1.9548)
mm (in)
0.50 (0.020)
Standard 49.454-49.458 (1.9470-1.9472)
undersize
Minimum 49.402 (1.9450)
0.75 (0.030)
Standard
49.204-49.208 (1.9372-1.9373)
undersize
Minimum 49.152 (1.9351)
Main journal taper and out-of-round mm (in) 0.05 (0.0020) max.
Standard
Standard 44.940-44.956 (1.7693-1.7699)
size
Minimum
44.908 (1.7680)
0.25 (0.010)
Standard 44.690-44.706 (1.7594-1.7601)
Crankpln diam8t8r
undersize
Minimum
44.658 (1.7582)
mm (in)
0.50 (0.020)
Standard 44.440-44.456 (1.7496-1.7502)
undersize
Minimum 44.408 (1.7483)
0.75 (0.030)
Standard 44.190-44.206 (1.7398-1.7404)
undersize
Minimum
44.158 (1.7385)
Crankpin taper and out-at-round mm (in) 0.05 (0.0020) max.
Main bearing
Main journal bearing oil clearance mm (in)
Standard 0.018-0.036 (0.0007-0.0014)
Maximum
0.10 (0.004)
Available undersize bearing
mm (in) 0.25 (0.010), 0.50 (0.020), 0.75 (0.030)
Crankpin bearing
Crankpin b8aring oil cl8aranc8 mm (in)
Standard 0.028-0.068 (0.0011-0.0027)
Maximum
0.10 (0.004)
Available undersize bearing mm (in)
0.25 (0.010), 0.50 (0.020), 0.75 (0.030)
Thrust bearing
Crankshaft end play mm (in)
Standard 0.080-0.282 (0.0031-0.0111)
Maximum
0.30 (0.012)
Standard size 2.500-2.550 (0.0984-0.1004)
Bearing width
mm (in)
0.25 (0.010) oversize 2.625-2.675 (0.1033-0.1053)
0.50 (0.020) oversize 2.750-2.800 (0.1083-0.1102)
0.75 (0.030) oversize 2.875-2.925 (0.1132-0.1152)
Timing belt
Belt deflection mm (in)/98 N (10 kg, 22 Ib)
9.0-11.5 (0.35-0.45)
D. LUBRICATION SYSTEM
Item
Engine
B6 DOHC
Lubricating method
Force-fed
Oil pump
Type
Trochoid gear
Relief pressure
kPa (kg/cm
2
,
psi) 343-441 (3.5-4.5, 50-64)
Oil pressum
kP (k
2 .
1
1,000 rpm
196-294 (2.0-3.0, 28-43)
a g/cm, pSI)
I
3,000 rpm
294-392 (3.0-4.0, 43-57)
TO-4