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Posted on Jan 02, 2017
SOURCE: 87 F150 5.0L Starter problems
you do not say that you got the vehicle in this condition so i am guessing that everything worked just fine for a while then all of a sudden it did this. it would be nice if you still had the starter that did work when you got the truck but i'm sure you turned it in for a core several starters ago. it may have had a different number of teeth on the gear that spins out and engages than the ones you are buying at the car parts store. if somebody changed the flywheel at some point in the life of the truck and used the starter that went to that flywheel that would cause the situation you describe. the only other thing i can imagine is the spacing on the starter, like maybe it needs to be shimmed to work properly. the way to check that is with a feeler gage after you bolt the starter up, but that is mostly general motors vehicles, probably not your truck. here is a way that you can check to make sure you have the right flywheel for your truck: get a paint pen or something that makes a mark you can see on the metal of the flywheel. now with the starter off get under the truck and make a mark on a tooth of the flywheel that you can see where it is when you start. oh yeah, you will need some help to do this. let the tooth you mark be number one. now have someone rotate the engine slowly (you might disconnect the coil so you don't accidentally start it, but you probably won't) and count the teeth on the flywheel, till that number one tooth comes back around. when you know what the number is on your flywheel call a parts store or the dealership and keep talking to people till you get somebody to tell you how many teeth it should be for your truck. if it doesn't match what you have then you know where the problem lies. at that point you can either replace the flywheel or figure out which starter goes to the one you have. if you already have the right one then i would check the tooth clearance. you should have .020 inch between starter gear teeth and flywheel teeth with starter fully extended. to check this you will have to connect the battery but loosely, bump the starter switch to get the starter to spin up and yank the battery negative while it is spun out. you can get the .020 check gage at a car parts store. hope that helps
Posted on Jun 12, 2009
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