Toyota Cressida/Corona/Crown/MarkII 1970-1982 Repair Guide

Adjustments

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DWELL



  1. Connect a dwell meter to the ignition system, according to the manufacturer's instructions.
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    1. When checking the dwell on a conventional ignition system, connect meter lead (usually black) to a metallic part of the car to ground the meter. The other lead (usually red) is connected to the coil primary post (the one with the small lead which runs to the distributor body).
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    3. When checking dwell on a model with transistorized ignition, ground one meter lead (usually black) to a metallic part of the car. Hook up the other lead (usually red) to the negative (-) coil terminal. Under no circumstances should the meter be connected to the distributor or the positive (+) side of the coil. (See the preceding Service Precautions).
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  3. If the dwell meter has a set line, adjust the needle until it rests on the line.
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  5. Start the engine. It should be warmed up and running at the specified idle speed.
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It is not necessary to check the dwell on the fully transistorized system. It is set at the factory and requires no adjustment.


CAUTION
Be sure to keep fingers, tools, clothes, hair, and wires clear of the engine fan. The transmission should be in Neutral (or Park), parking brake set, and the engine running in a well ventilated area.

  1. Check the reading on the swell meter. If you have a 4-cylinder engine and your meter doesn't have a 4-cylinder scale, multiply the 8-cylinder reading by two.
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  3. If the meter reading is within the range specified in the Tune-Up Specifications chart, shut the engine OFF and disconnect the dwell meter.
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  5. If the dwell is not within specifications, shut the engine OFF and adjust the point gap as previously outlined. Increasing the point gap decreases the dwell angle and vice versa.
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  7. Adjust the points until dwell is within specifications, then disconnect the dwell meter. Adjust the timing; see the following information.
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PICKUP AIR GAP



  1. Remove the distributor cap, rotor, and dust shield.
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  3. Turn the engine over (you may use a socket wrench on the front pulley bolt to do this) until the projection on the pickup coil is directly opposite the signal rotor tooth.
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  5. Get a non-ferrous (paper, brass, or plastic) feeler gauge of 0.30mm, and insert it into the pickup air gap. DO NOT USE AN ORDINARY METAL FEELER GAUGE! The gauge should just touch either side of the gap (the permissible range is 0.2-0.4mm).
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  7. If the gap is either too wide or too narrow, loosen the two Phillips screws mounting the pickup coil onto the distributor base plate. Then, wedge a screwdriver between the notch in the pickup coil assembly and the two dimples on the base plate, and turn the screwdriver back and forth until the pickup gap is correct.
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  9. Tighten the screws and recheck gap, readjusting if necessary.
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POINT GAP



The point set on this ignition system is covered by a piece of protective plastic shielding. Because of this, the gap must be checked between the point rubbing block and the distributor cam lobe instead of between the two points. Do not try to remove the plastic shielding as it will damage the point set.

  1. Using your hands, a wrench on the crankshaft pulley nut, or a remote starter switch, rotate the engine so that the rubbing block is resting on the low point (flat side) of the cam lobe.
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  3. Insert a 0.018 inch (0.46mm) flat feeler gauge between the rubbing block and the cam lobe; a slight drag should be felt.
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  5. If no drag can be felt or if the feeler gauge cannot be inserted at all, loosen, but do not remove, the point hold-down screw.
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  7. Insert a flat bladed tool into the point adjustment slot. Rotate the screwdriver until the proper gap is achieved. The gap is increased by rotating the screwdriver counterclockwise and decreased by rotating it clockwise.
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  9. Tighten the point hold-down screw. Lubricate the cam lobes, breaker arm, rubbing block, arm pivot and distributor shaft with special high temperature distributor grease.
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