Re: Starter Continues to Crank When Engine is Running
Posted by JD in KC On 2011/7/8 23:46:58
The saga continues. During a few days of rain when I couldn't work on priority 1 (new patio) I got the starter out of the '49. This particular Auto-Lite starter that cranks the 356 engines is an odd duck.
1. When the starter receives power from the carburetor start switch a small electro-magnet pulls a hinged contact down which in turn...
2. Completes a circuit to a very powerful electro-magnet that causes a piston to be pulled in.
3. The piston is attached via a lever to a sliding gear that moves to engage the flywheel...
4. As the piston 'bottoms out' it pushes a button at the end of the cylinder shaft which...
5. Causes a copper washer to slam against the ends of the large copper bolts completing the heavy duty circuit from the battery to the starter motor.
6. The starter commences to turn over.
Rube Goldberg would be envious!
I cleaned all the moving parts and electrical contacts that are even remotely involved in controlling the power to the starter motor. lubed the parts that needed lubing. Cleaned the case, scraped off the paint and re-painted it.
I re-assembled the starter and bench-tested all the components one at a time. They all checked out. No sticking, no shorts. Then I tested the whole process together. The starter always stopped when the current was removed from the small primary electro-magnet. Twenty-five starts / stops without a hiccup.
So... I'm thinking I either have a short in the wiring between the carburetor/ignition switch and the starter
(as suggested by Tim Cole), or... something mechanical is preventing the springs from retracting the drive gear when it's actually in contact with the flywheel (I think this is unlikely).
Next step, re-install in the car and see what happens. Will let you know.
Attach file:
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1. When the starter receives power from the carburetor start switch a small electro-magnet pulls a hinged contact down which in turn...
2. Completes a circuit to a very powerful electro-magnet that causes a piston to be pulled in.
3. The piston is attached via a lever to a sliding gear that moves to engage the flywheel...
4. As the piston 'bottoms out' it pushes a button at the end of the cylinder shaft which...
5. Causes a copper washer to slam against the ends of the large copper bolts completing the heavy duty circuit from the battery to the starter motor.
6. The starter commences to turn over.
Rube Goldberg would be envious!
I cleaned all the moving parts and electrical contacts that are even remotely involved in controlling the power to the starter motor. lubed the parts that needed lubing. Cleaned the case, scraped off the paint and re-painted it.
I re-assembled the starter and bench-tested all the components one at a time. They all checked out. No sticking, no shorts. Then I tested the whole process together. The starter always stopped when the current was removed from the small primary electro-magnet. Twenty-five starts / stops without a hiccup.
So... I'm thinking I either have a short in the wiring between the carburetor/ignition switch and the starter
(as suggested by Tim Cole), or... something mechanical is preventing the springs from retracting the drive gear when it's actually in contact with the flywheel (I think this is unlikely).
Next step, re-install in the car and see what happens. Will let you know.
Attach file:
(26.19 KB)
(26.84 KB)
(27.99 KB)
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