86 f250 starter problems help
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New User
Joined: Feb 2014
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I'm going to check all of the voltage tomorrow. Took starter off and back to autozone and had them test it. It tested good. Looking at the gears on starter closer it looked like some wear on the front section of the teeth. The guys at autozone said they thought we might have a flywheel problem that if the flywheel is worn it would grind the starter teeth. I'm going to look at fly wheel tomorrow. Would these be a possible cause?
Laughing Gas
Joined: Apr 2013
Posts: 1,049
Likes: 65
Unfortunately yes. If there's a bad spot on the flywheel teeth it's kind of like roulette. It'll start just fine for a while, until your flywheel stops at just the wrong place, the damaged spot. Then the gears will clash. I had one of those little blazers with that problem once.
With yours being a manual, if you can get in the habit of parking it on a bit of a slope, in the event you have a problem you cloud let it roll a little and bump the motor with the clutch. That will give you a different spot on the flywheel to try with the starter. That's what I did with the blazer.
I've never heard of anyone filing damaged flywheel teeth without disassembly. I wonder it that's even possible? Hopefully someone who knows more than me will come along.
Otherwise, let's hope it's something simple like wiring.
With yours being a manual, if you can get in the habit of parking it on a bit of a slope, in the event you have a problem you cloud let it roll a little and bump the motor with the clutch. That will give you a different spot on the flywheel to try with the starter. That's what I did with the blazer.
I've never heard of anyone filing damaged flywheel teeth without disassembly. I wonder it that's even possible? Hopefully someone who knows more than me will come along.
Otherwise, let's hope it's something simple like wiring.
2nd Gear
Joined: Jan 2023
Posts: 2
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Ever figure the issue out?
I have the 1986 250 7.5 460 manual. I can’t figure out why my starter doesn’t engage the flywheel. It worked before no problem, then stopped engaging the flywheel. I would rock the truck to roll the flywheel over and then it would engage again.
New flywheel installed with new clutch and flex plate and go to start the truck and the same issue of starter activating but not engaging. The starter is good, it was bench tested at the auto store and I pulled it all the way out and held it myself to see it activate without any issue.
Battery is in proper working condition and I
thoroughly cleaned my grounding to make sure that wasn’t an issue.
Anybody have any advice? As it is, I’m tempted to shim the upper bolt to bring the the starter at an angle to get the bendix to engage the flywheel.
New flywheel installed with new clutch and flex plate and go to start the truck and the same issue of starter activating but not engaging. The starter is good, it was bench tested at the auto store and I pulled it all the way out and held it myself to see it activate without any issue.
Battery is in proper working condition and I
thoroughly cleaned my grounding to make sure that wasn’t an issue.
Anybody have any advice? As it is, I’m tempted to shim the upper bolt to bring the the starter at an angle to get the bendix to engage the flywheel.
FTE Legend
Joined: Nov 2015
Posts: 30,960
Likes: 4,129
From: Angier, NC
I dont know if this is true with the 460 motor or not but on other motors there is starter for autos and 1 for manual transmissions.
If not you will have to do some measuring.
From the face where the starter bolts up measure from there to the center of the teeth on the flywheel.
Then you have to test to see how far the gear pops out and then measure from the face that mates to the bell housing out to where the gear would be.
The first measurement should match the 2nd one if it is going to work.
You do have the thin metal motor plate on the back of the motor right?
This locates the starter and with out it can cause issues.
Dave ----
If not you will have to do some measuring.
From the face where the starter bolts up measure from there to the center of the teeth on the flywheel.
Then you have to test to see how far the gear pops out and then measure from the face that mates to the bell housing out to where the gear would be.
The first measurement should match the 2nd one if it is going to work.
You do have the thin metal motor plate on the back of the motor right?
This locates the starter and with out it can cause issues.
Dave ----
2nd Gear
Joined: Jan 2023
Posts: 2
Likes: 0
I dont know if this is true with the 460 motor or not but on other motors there is starter for autos and 1 for manual transmissions.
If not you will have to do some measuring.
From the face where the starter bolts up measure from there to the center of the teeth on the flywheel.
Then you have to test to see how far the gear pops out and then measure from the face that mates to the bell housing out to where the gear would be.
The first measurement should match the 2nd one if it is going to work.
You do have the thin metal motor plate on the back of the motor right?
This locates the starter and with out it can cause issues.
Dave ----
If not you will have to do some measuring.
From the face where the starter bolts up measure from there to the center of the teeth on the flywheel.
Then you have to test to see how far the gear pops out and then measure from the face that mates to the bell housing out to where the gear would be.
The first measurement should match the 2nd one if it is going to work.
You do have the thin metal motor plate on the back of the motor right?
This locates the starter and with out it can cause issues.
Dave ----
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