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We have a 1986 Ranger with an automatic transmission. The VIN indicates that it has a 2.0 ltr 4-cylinder engine, but the engine is actually a 2.6 ltr 4 cylinder with EFI. I have been driving this truck for eight years and over 70,000 miles, and thought I had seen all of it's tricks. I hadn't.
Recently, the starter has continued to grind, even after the engine has started and/or once I have turned the key off. This last time it ground on down until the battery died. I disconnected the battery because I could see smoke and smell hot wiring. Not much, but enough to concern me.
I vaguely recall that my brother had a full sized Ford P/U that burned up, literally, because of a similar problem. I was overseas at the time, so I don't really know a lot of details.
I have done most of the maintenance on this truck while I've had it, including replacing the starter once and the starter solenoid recently. It's been a great truck, but even though it was her father's truck, this latest bad habit has my wife looking at new Rangers.
Not sure if it applies to Ford, but I've seen this happen on GM's, in particular SB Ch***. What happens is the gear on the bendix engages too tightly with the flywheel and this is why they usually give you a couple shimes in case you need them. The shims go between the block and the starter.