RESTORING HISTORY ONE CAR AT A TIME

Ignition

BREAKER POINT AND SPARK PLUG GAP

It is very important that spark plugs and breaker points be adjusted to the same limits used at the factory (see Fig. 1117). Please see that this practice is followed in your shop.

SPARK PLUG GAP CHANGED

The spark plug gap has been changed from .027″ to .035″. This new setting has been found to give better all-round performance. When an engine does not idle properly, often all that is necessary is to slightly open up the spark plug gaps. When an instance of this kind is brought to your attention, always …

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IGNITION WIRE

On a percentage of truck production, a small leather boot is placed over the ignition wire terminal on the back of the instrument panel as shown in Fig. 921. The boot was placed at that point simply to prevent any possibility of the ignition wire grounding against the gas gauge flange as the clearance was …

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Coils

Thoroughly clean off any dirt, grease or moisture from thebakelite insulatoron the coil. Moisture, dirt or grease cause a leakage of cur- rent that makes the coil seem weak or dead. (See Page 368, August, 1929, Bulletin for detailed instructions.)

Distributor

Contacts on the distributor body and on the rotor should be cleaned with very fine sandpaper. This will remove any corrosion on the contacts. Corrosion sets up a high resistance in the secondary circuit. Check the breaker point gap. The gap should measure between .018 and .022.

Spark Plugs

Remove spark plugs, thoroughly clean and adjust the points until the gap measures between .032″ and .035″. In some cases, where a motor does not idle satisfactorily, the gaps can be set slightly larger. Engineers state that best results are obtained by replacing spark plugs every 10,000 miles.

LOOSE TIMING GEAR

Here is a quick way to check for a loose timing gear that is causing a knock. With the engine running slowly, screw out timing pin, located in timing gear cover, and insert opposite end of pin into opening (see Fig. 850). Care must be used not to let your hand come in contact with …

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CHECK BREAKER POINT GAPS

When a new car comes in for inspection, always be sure to check the breaker point gap. This is important. During the first few hundred miles a new car is driven, the contact point on the fiber block on the breaker arm assembly slightly wears until a hard glaze forms on the block. This glaze …

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Breaker Points

The distributor breaker points should occasionally be checked to see that the points are clean, smooth and meet squarely. A point which is in good condition has a dull frosted appearance. Whenever necessary to clean the points use a fine oil stone-never a file. If badly pitted new points should be installed. The gap between …

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RETARD SPARK LEVER WHEN STARTING

Owners should be instructed to be sure to retard the spark lever when starting the engine. Broken or bent starting motor armature shafts can invariably be traced to failure to retard the spark lever when starting engine.

Adjusting Breaker Contact Points

Correct adjustment of breaker contact points and correct ignition timing play such an important part in the satisfactory operation of an engine, that it is absolutely necessary that every mechanic thoroughly understand the correct procedure. So that there may be no misunderstanding, we are again describing these operations. The gap between the breaker points is …

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Ignition Timing

When installing AA-5791 spring shackle bushing, be sure to install it with the oil groove in the bushing pointing inward (see Fig. 707). This is important. Unless properly installed, it will be impossible to force lubrication between shackle and bushing. From letters received it is evident that some dealers have experienced difficulty in installing spring …

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