Starter on 2002 Ford Winstar keeps on breaking.
Mechanic removed spark plugs and found water in pistons. Repaired air intake. Learned that water was coming in through air intake filter system. Once again starter broke. Engine won't turn over. Starter had broken teeth.
I don't know about water in pistons and things... sounds suspect. If the starter has borken teeth, the bendix can't be engaging the flex plate or flywheel (depending on auto or manual trans) properly. Maybe wrong starter? Maybe it's time to look for another mechanic?
Check the flywheel for broken teeth as well. Make sure the starter drive to flywheel ring gear clearance is .020 inch. Shims may need to be used to get this proper clearance. HTH. -Jim
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