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  #1   IP: 199.229.249.134
Old 11-24-2019, 11:04 AM
WesHeald WesHeald is offline
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My starter often only spins and doesn't engage

I had my Delco starter motor rebuilt and just installed a new solenoid, but I still have this problem. It takes 2 or 3 tries to get the starter to engage. Anyone have any ideas?
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  #2   IP: 97.93.70.7
Old 11-24-2019, 11:32 AM
Dave Neptune Dave Neptune is offline
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Did you check the switch. If the switch either key or push button could be giving a weak signal.
Try taking a "hot wire" to the solenoid start post and see if it engages properly then.
Also be sure the battery connection is good and the battery is fully charged.

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  #3   IP: 100.36.65.17
Old 11-24-2019, 11:46 AM
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edwardc edwardc is offline
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Quote:
Originally Posted by WesHeald View Post
I had my Delco starter motor rebuilt and just installed a new solenoid, but I still have this problem. It takes 2 or 3 tries to get the starter to engage. Anyone have any ideas?
Sounds like your pinion/bendix gear is not reliably extending fully to engage the flywheel. There are three common causes of this:
  1. (most common) Dried up grease or dirt on the threads of the starter shaft and the pinion/bendix
  2. Failing overrunning/one-way clutch in the bendix
  3. Damage to the threads on the shaft or bendix (not common)

There's a good (if wordy) 16 minute video that explains all this:
https://www.youtube.com/watch?v=RhdSq4WOaDM
It's not Atomic-4 specific, but the principles are the same.
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  #4   IP: 67.176.202.156
Old 11-24-2019, 09:17 PM
Sam Sam is offline
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Ed's points are spot on if you hear the starter spinning but not engaging the flywheel. I had the same problem once after a starter rebuild - the bendix drive would occasionally stick in the retracted position. Took a couple of taps with a hammer to free it up to engage the flywheel. Solved the problem by taking the starter apart again and inserting two large plastic neoprene washers at the end of the shaft [aft end]. This reduced the friction between the metal parts and the bendix drive no longer "lock up" when retracted. It's been about a dozen seasons and still working.
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