Timing the Model A engine
(New page: Timing the Ignition As the spark must occur at the end of the compression stroke, on top dead center, the timing must be checked from that point. To find the compression stroke and time t...) |
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| − | Timing the Ignition | + | *Timing the Ignition |
| − | As the spark must occur at the end of the compression stroke, on top dead center, the timing must be checked from that point. To find the compression stroke and time the spark, proceed with the following ten steps: | + | *As the spark must occur at the end of the compression stroke, on top dead center, the timing must be checked from that point. To find the compression stroke and time the spark, proceed with the following ten steps: |
| − | 1-Fully retard the spark lever on the steering column; that is, push all the way up. | + | *1-Fully retard the spark lever on the steering column; that is, push all the way up. |
| − | 2-Using a standard thickness gauge, check for .018 to .022 gap between breaker contact points. | + | *2-Using a standard thickness gauge, check for .018 to .022 gap between breaker contact points. |
| − | 3-Remove cap screw, which has timing pin attached to its head, located on front side of timing gear cover and insert the pin into the opening. | + | *3-Remove cap screw, which has timing pin attached to its head, located on front side of timing gear cover and insert the pin into the opening. |
| − | 4-With starting crank, turn the engine over slowly while pressing in firmly on the pin. When piston No. 1 reaches the end of the compression stroke, the timing pin will slip into a small recess in the camshaft gear. | + | *4-With starting crank, turn the engine over slowly while pressing in firmly on the pin. When piston No. 1 reaches the end of the compression stroke, the timing pin will slip into a small recess in the camshaft gear. |
| − | 5-With the pin now resting in this recess, remove distributor cover, lift off the rotor and distributor body. | + | *5-With the pin now resting in this recess, remove distributor cover, lift off the rotor and distributor body. |
| − | 6-Loosen cam locking screw until cam can be turned. 7-Replace rotor and turn it until rotor arm is opposite No. 1 contact point in distributor head. | + | *6-Loosen cam locking screw until cam can be turned. 7-Replace rotor and turn it until rotor arm is opposite No. 1 contact point in distributor head. |
[[Image:Model_A_dist.jpg]] | [[Image:Model_A_dist.jpg]] | ||
| − | A | + | *A |
| − | To Time the Ignition,first retard spark on steering column,then remove distributor cower,rotor,and body,shown above. | + | *To Time the Ignition,first retard spark on steering column,then remove distributor cower,rotor,and body,shown above. |
[[Image:Model_A_dist_3.jpg ]] | [[Image:Model_A_dist_3.jpg ]] | ||
| − | B | + | *B |
| − | Set Points,using screwdriver and gap gauge to | + | *Set Points,using screwdriver and gap gauge to |
about ,o18 or ,o22 | about ,o18 or ,o22 | ||
[[Image:Model_A_dist_5.jpg ]] | [[Image:Model_A_dist_5.jpg ]] | ||
| − | C | + | *C |
| − | Timing Pin is inserted through hole on front side | + | *Timing Pin is inserted through hole on front side |
of timing gear cover and engine turned by crank | of timing gear cover and engine turned by crank | ||
until pin falls into recess on face of gear. | until pin falls into recess on face of gear. | ||
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[[Image:Model_A_dist_2.jpg ]] | [[Image:Model_A_dist_2.jpg ]] | ||
| − | D | + | *D |
| − | Loosen Cam Locking Screw ( above ),Then replace rotor and | + | *Loosen Cam Locking Screw ( above ),Then replace rotor and |
distributor body.Turn rotor until arm is opposite No. 1 | distributor body.Turn rotor until arm is opposite No. 1 | ||
contact point.Remove rotor and body,turn cam | contact point.Remove rotor and body,turn cam | ||
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[[Image:Model_A_dist_4.jpg]] | [[Image:Model_A_dist_4.jpg]] | ||
| − | E | + | *E |
Breaker Cam can be rocked with fingers to set ignition timing.Before checking timing with switch on, be sure | Breaker Cam can be rocked with fingers to set ignition timing.Before checking timing with switch on, be sure | ||
to remove timing pin from hole on gear cover. | to remove timing pin from hole on gear cover. | ||
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| − | 8--Withdraw rotor from cam and slightly turn the cam in a clockwise direction until the breaker points just close. Then tighten the cam locking screw securely to prevent backlash in the distributor shaft from affecting the timing. | + | *8--Withdraw rotor from cam and slightly turn the cam in a clockwise direction until the breaker points just close. Then tighten the cam locking screw securely to prevent backlash in the distributor shaft from affecting the timing. |
| − | 9-Now check the timing by withdrawing the timing pin from the recess in the timing gear, turn on the ignition switch, then again insert the timing pin into the timing gear cover. Turn the engine with the crank while pressing in on the timing pin. If properly timed, a spark should occur between the breaker points just as the pin falls into the timing gear recess. If a spark does not occur, some error has been made and it will be necessary to retrace your work until the spark appears. | + | *9-Now check the timing by withdrawing the timing pin from the recess in the timing gear, turn on the ignition switch, then again insert the timing pin into the timing gear cover. Turn the engine with the crank while pressing in on the timing pin. If properly timed, a spark should occur between the breaker points just as the pin falls into the timing gear recess. If a spark does not occur, some error has been made and it will be necessary to retrace your work until the spark appears. |
| − | 10-Withdraw timing pin, turn it around, and turn cap screw back tightly into timing gear cover. Replace rotor and distributor cover. | + | *10-Withdraw timing pin, turn it around, and turn cap screw back tightly into timing gear cover. Replace rotor and distributor cover. |
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