Re: questions about my 1947 2126 seven passenger
Posted by HH56 On 2017/6/30 18:04:07
Depends on where the clicking is coming from. Assuming the 2126 has the proper starter, the 356 engine will have the large Autolite gear reduction with solenoid pinion shift starter.
If it is just a tiny click coming from the solenoid area, that could be the relay which energizes the solenoid. The pinion shift starters actually have a small relay inside the end of the solenoid box which brings in the solenoid. The relay coil is brought out via the two small screw terminals. If the sound is heavier than a single relay it could also be the solenoid but perhaps a bad connection or weak battery is not able to supply enough current to bring the solenoid plunger in far enough to move the contact plate and start the motor turning.
The solenoid has two coil windings fed by the relay. One is a small shunt winding which serves as a hold coil and is not able to bring in the solenoid on its own. The other is a large heavy winding which is in series with the starter motor and does the work of bringing in the solenoid. Once the solenoid is engaged and the contact plate moves enough to complete the circuit to start the motor turning, the large coil is bypassed and no longer active. The small coil holds the plunger in until the start switch is released. Verify the small copper strap between motor and solenoid is connected and tight. Also, even though newly rebuilt, it might be worth removing the brush cover band to check that nothing was jarred and the brushes are tightly in place making good contact with the commutator so you can be sure the series coil is in the circuit.
If the car is stock, the 356 engine cars with a carb starter switch had a safety circuit which has been known to act up. If the relay is coming in, that circuit would not be your issue. Just so you know the operation, that safety circuit consists of the ground to the solenoid relay actually coming from the generator. If it has stock wiring, there is a wire connecting one of the relay coil terminals at the solenoid to the ARM or GEN terminal at the voltage regulator. It uses the ARM wire to connect to the generator and thru the generator armature coils, to ground. Function is, If the engine is off, the generator is not producing voltage so via the internal ground in the generator, the relay is connected to ground and can energize when the starter switch is operated. Once the engine starts, the generator produces voltage out and there is no longer a ground available. If something should fail or be out of adjustment and the carb switch became active, the relay can not operate and bring in the solenoid to energize the starter.
If the generator is out or wiring is disconnected or possibly the generator brushes are faulty the starter may be intermittent or just will not operate. If there was a no start problem in the past sometimes that safety circuit was disconnected and the relay coil was grounded directly rather than thru the generator.
Here is the schematic for the Autolite solenoid and how the ground to relay is provided.
Attach file:
(85.20 KB)
If it is just a tiny click coming from the solenoid area, that could be the relay which energizes the solenoid. The pinion shift starters actually have a small relay inside the end of the solenoid box which brings in the solenoid. The relay coil is brought out via the two small screw terminals. If the sound is heavier than a single relay it could also be the solenoid but perhaps a bad connection or weak battery is not able to supply enough current to bring the solenoid plunger in far enough to move the contact plate and start the motor turning.
The solenoid has two coil windings fed by the relay. One is a small shunt winding which serves as a hold coil and is not able to bring in the solenoid on its own. The other is a large heavy winding which is in series with the starter motor and does the work of bringing in the solenoid. Once the solenoid is engaged and the contact plate moves enough to complete the circuit to start the motor turning, the large coil is bypassed and no longer active. The small coil holds the plunger in until the start switch is released. Verify the small copper strap between motor and solenoid is connected and tight. Also, even though newly rebuilt, it might be worth removing the brush cover band to check that nothing was jarred and the brushes are tightly in place making good contact with the commutator so you can be sure the series coil is in the circuit.
If the car is stock, the 356 engine cars with a carb starter switch had a safety circuit which has been known to act up. If the relay is coming in, that circuit would not be your issue. Just so you know the operation, that safety circuit consists of the ground to the solenoid relay actually coming from the generator. If it has stock wiring, there is a wire connecting one of the relay coil terminals at the solenoid to the ARM or GEN terminal at the voltage regulator. It uses the ARM wire to connect to the generator and thru the generator armature coils, to ground. Function is, If the engine is off, the generator is not producing voltage so via the internal ground in the generator, the relay is connected to ground and can energize when the starter switch is operated. Once the engine starts, the generator produces voltage out and there is no longer a ground available. If something should fail or be out of adjustment and the carb switch became active, the relay can not operate and bring in the solenoid to energize the starter.
If the generator is out or wiring is disconnected or possibly the generator brushes are faulty the starter may be intermittent or just will not operate. If there was a no start problem in the past sometimes that safety circuit was disconnected and the relay coil was grounded directly rather than thru the generator.
Here is the schematic for the Autolite solenoid and how the ground to relay is provided.
Attach file:
(85.20 KB)
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