TOYOTA PREVIA 91-97 REPAIR MANUAL

GENERAL INFORMATION AND MAINTENANCE 1-35

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Fig. 94 Be sure to place the wires in the correct locations Fig. 96 Check the inside of the cap for cracks, burns or wear

Fig. 95 Insert the coil wire last and make sure it is secure

Connect the spark plug wires in their correct locations.

Install and secure the No. 2 cylinder head cover and RH seat.

a. Tighten the bolts to the following specifications:

Service hole cover bolts—10 ft. Ibs. (14 Nm)

Jack holder—10ft. Ibs. (14 Nm)

RH seat leg—29 ft. Ibs. (39 Nm)

RH seat—29 ft. Ibs. (39 Nm)

RH seat belt-to-floor pan—31 ft. Ibs. (42 Nm)

Start the vehicle and check for proper operation.

INSPECTION

t See Figures 96 and 97

When inspecting a cap and rotor, look for signs of cracks, carbon track-
ing, burns and wear. The inside of the cap may be burnt or have wear on
the carbon ends. On the rotor, look at the tip for burning and excessive
wear.

Fig. 97 Inspect the rotor tip for burning

Ignition Timing

GENERAL INFORMATION

Ignition timing is the measurement (in degrees) of crankshaft position at

the instant the spark plug fires. Ignition timing is adjusted by loosening the

distributor locking device and turning the distributor in the engine.

It takes a fraction of a second for the spark from the plug to completely

ignite the mixture in the cylinder. Because of this, the spark plug must fire

before the piston reaches TDC (top dead center, the highest point in its

travel), if the mixture is to be completely ignited as the piston passes TDC.

This measurement is given in degrees (of crankshaft rotation) before the pis-

ton reaches top dead center (BTDC). If the ignition timing setting for your

engine is 10° BTDC, Mils means that the spark plug must fire at a time when

the piston for that cylinder is 10° before top dead center of its compression

stroke. However, this only holds true while your engine is at idle speed.