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GENERALINFORMATIONAND
MAlNTENANdE I-27
ADJUSTMENT
u See Figures 120 and 121
The only engines that require periodic adjustment
of the valves are the 1.5L engine in the 1990-95 Mi-
rage and the 1.8L in the 1993-95 Mirage.
Incorrect valve clearance will cause noisy
and/or unsteady engine operation, reduced
engine output, and possible engine damage.
Check the valve clearances and adjust as re-
quired while the engine is hot.
1. Warm the engine to operating temperature.
Turn the engine
OFF.
Disconnect the negative battery
cable.
2. Remove all spark plugs so engine can be eas-
ily turned by hand
3. Remove the valve cover.
4. Turn the crankshaft clockwise until the notch
on the pulley is aligned with the
T
mark on the timing
belt lower cover. This brings both No. 1 and 4 cylin-
der pistons to Top Dead Center (TDC).
5. Wiggle the rocker arms on No. 1 and 4 cylin-
ders up and down to determine which cylinder is at
TDC on the compression stroke. Both rocker arms
should move if the piston in that cylinder is at TDC
on the compression stroke.
6. Measure the valve clearance with a feeler
gauge. When the No. 1 piston is at TDC on the com-
pression stroke, check No. 1 intake and
exhaust;
No.
2 intake and exhaust. Then turn the crankshaft clock-
wise 1 turn to bring No. 4 to TDC on its compression
stroke. With No. 4 on TDC, compression stroke,
check No. 2 exhaust and intake; and No. 4 intake and
exhaust. Clearance is as follows:
1990-92 1.5L engine:
No.1
No.2
No.3
No.4
when engine is on TDC of cylinder 1 and
(B)
when engine is on TDC of cylinder 4
No.1
No.2
No.3
No.4
AA
AA
BB
BB
93151g10
Fig. 121 Adjusting the valve clearance
l
Exhaust valve: 0.0098 in. (0.25mm)
screw. When at specification, tighten the locknut. Be
l
Intake valve: 0.0059 in. (0.15mm)
1993-95 1.5L engine:
sure to hold the screw securely in place when tight-
l
Exhaust valve: 0.0098 in. (0.25mm)
ening the locknut to prevent it from turning when
* Intake valve: 0.008 in. (0.20mm)
tightening the locknut. Tightening torque of the lock-
nut is as follows:
1993-95 1.8L engine:
l
Exhaust valve: 0.012 in. (0.30mm)
l
1.5L engine: 9-11 ft. Ibs. (12-15 Nm)
l
Intake valve: 0.008 in. (0.20mm)
l
1.8L engine: 7 ft. Ibs. (9 Nm)
8. Recheck the clearance and readjust.
7. If the valve clearance is out of specification,
9. After adjusting the valves, install the valve
loosen the rocker arm locknut and adjust the clear-
ante using a feeler gauge while turning the adjusting
cover and spark plugs, and connect the negative bat-
tery cable.
Engine
ENGINE TUNE-UP SPECIFICATIONS
Ignition
Spark Plugs
liming
Fuel
Idle
Speed
Valve
Displacement
Engine
Gap
(as.)
Pump
(rpm)
Clearance
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