1. Starter Motor Issues:
* Bendix Gear: This is the most common cause. The bendix gear is the part that engages the flywheel to crank the engine. If it's stripped, broken, or sticking, you'll get that grinding noise. It's possible the cold weather contributed to this if there's some stiffness in the mechanism.
* Starter Solenoid: This is the electrical switch that activates the starter motor. If it's failing, it might not fully engage the bendix gear, leading to grinding. A clicking sound *instead* of grinding often points to a solenoid problem. However, if the solenoid is partially engaging, you could still hear grinding.
* Starter Motor Brushes: Worn or damaged brushes within the starter motor can prevent proper operation and cause grinding.
2. Flywheel Issues (less likely, but possible):
* Flywheel Teeth: While less common, damaged flywheel teeth could be interacting poorly with the bendix gear, producing the grinding noise. This is more likely if you've recently had work done on the transmission or engine.
Troubleshooting Steps:
1. Listen Carefully: Try starting again (briefly!), but listen *very* closely to where the grinding is coming from. Is it directly from the starter motor itself, or more towards the bellhousing (where the engine and transmission meet)? This helps pinpoint the problem.
2. Tap the Starter (carefully!): With the key *off*, gently tap the starter motor with a hammer or mallet. Sometimes a stuck bendix gear can be freed this way. Be extremely cautious! Don't hit it hard, and make sure the key is off and the battery is disconnected if you're uncomfortable doing this.
3. Check the Battery Terminals Again: Make sure the connections are clean and tight. Even if you checked them, a slight corrosion could develop quickly and impede current flow.
4. Have Someone Turn the Key While You Observe: While someone turns the ignition key to the "start" position, watch the starter motor. Do you see the bendix gear engaging and retracting properly? If not, this visually confirms a starter motor problem.
5. Check for Loose Bolts: Inspect the starter motor mounting bolts. Loose mounting can cause misalignment and grinding.
If the grinding persists:
You'll likely need professional help. The starter motor may need to be removed, inspected, and repaired or replaced. A mechanic can diagnose the exact problem and perform the necessary repairs. Given it's a classic car, consider a specialist familiar with older vehicles. Trying to fix a starter yourself without experience can be dangerous due to high amperage and moving parts.
