Ignition Timing

Connect tachometer and timing light to engine. The positive (+) lead of tachometer is connected to negative (-) terminal of ignition coil. With engine at normal operating temperature, choke valve fully opened, and transmission in "N" or neutral position, be sure all hoses are connected and accessories turned off. Adjust idle speed to correct specification.
CAUTION: Do not allow tachometer connector to touch ground, or damage may occur to the system.

On models with dual diaphragm distributors, disconnect and plug vacuum hoses at both main and sub-diaphragms. On all models, adjust timing by turning distributor. Reconnect hoses to distributor diaphragms.

NOTE: On Federal low altitude Land Cruiser models, flywheel timing mark should move when vacuum hose between HAC valve and distributor sub-diaphragm is pinched near valve. On high altitude models, timing mark should move when sub-diaphragm hose is reconnected.

Fig 1: Ignition Timing Marks

IGNITION TIMING (Degrees BTDC@RPM)

Application	Setting
Cressida & Supra	8@950
Land Crusier	7@950