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Sounds like the starter drive is not engaging. The starter drive on the starter is not engaging into the flywheel. You would be able to hear the motor on the starter it is just that the drive gear on the end of the starter is not coming out to the flywheel .
When you first turn the key to"on" most starter posts pop out to engage into the flywheel gears. If you don't hear a click when turning the key to "on" re-check the wiring.
If your starter is spinning but no engaging the flywheel, then you have 2 possibilities going on here, the # 1 and most likely cause is the bendix on the starter is not kicking out to engage the flywheel so you'll need a new starter... pretty cheap fix.
# 2 is that for some reason the teeth on the flywheel have been chewed away and now the starter gear can't crab the flywheel, this would only be a secondary answer if for some reason your starter had been grinding while trying to engage. Just an FYI, this is very rare but has happened, considering that your engine flywheel stops at the same spot every time you turn your engine off, so the starter is constatly grabbing the same flywheel teeth all its life. For this fix, you'll have to have the transmission removed and have a new flywheel installed on your engine.
Is the engine turning over with the key in the start position? If the engine is not spinning over and you hear a whining noise, the starter is not engaging the flywheel. If the engine is turning over with the starter engaged, the engine has most likely jumped time that creates low or no compression which results in the whining noise.
The starter solenoid mounted on top of the starter has two functions, as the key is operated the solenoid slides the starter pinion to engage the flywheel, THEN operates heavy duty contacts to power the motor. The solenoid is not engaging the pinion.
either the starter is not kicking out its gear to meet the flywheel or the flywheel has missing teeth. either way the next step is to remove the starter so it can be tested outside of the vehicle and the flywheel can be looked at through the hole where the starter sat.
Without hearing the sound it makes - it's kind of hard to diagnose.
The engine starting process consists of turning the key to start, the starter motor's rotor moving forward to engage the engine's flywheel, and then the starter motor 's "rotor" spinning until you move the key from "start" to "run". You can hear the starter motor spinning - but one usually can't hear the rotor moving forward to engage the flywheel. As a result, you hear the odd spinning sound - which is the starter rotor spinning. The engine never actually turns over because the rotor never engages the fly wheel. If this is the case, then it is very likely that your starter needs to be checked and / or replaced.
The starter sprocket wheel is thrusted into engaging the flywheel by a big solenoid. That solenoid is integral part of the starter motor. If the starter turn itself but it doesn't turns the engine then either it was incorrectly installed or the thrust solenoid is defective.
Simple test: take out the starter, attach it to a bench, connect to it thew power cables from a battery (the minus one to the body, the plus one to the big connector bolt) then short the big connector bolt to the small one with a screwdriver - the solenoid should activate, the sprocket should be thrusted forward and the motor should start spinning it. If that doesn't happen then the starter you just bought is defective, replace it. If that happens the starter was incorrectly installed on the engine. Reinstall it correctly.
could be a number of things check battery first to see if there is power at the battery then check power at starter if that is okay then see if you can hear the starter engaging. if there is unusual noise then the starter may now be engaging with the flywheel correctly do to either bad teeth on starter or a warped flywheel. if the flywheel is new also don't let that fool you Ive seen new flywheels be warped many times but with out seeing the vehicle this is all i can come up with if the motor is not turning hope it helps
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