Starter grinding

  • 1 POST
  • 1991 CHEVROLET S-10
  • 2.8L
  • V6
  • 2WD
  • 100,000 MILES

My 1991 s10 was originally a 2.5 iron duke mated to a 5-speed transmission. I swapped in a carbed 1984 2.8 that was mated to a 4 speed trans. When I turn the key it makes a loud grinding sound and on rare occasions (2-3 times) it has actually started. I bought a new starter and I have the same problem. Does it need to be shimmed?

Do you
have the same problem?
Tuesday, March 29th, 2016 AT 4:35 PM

1 Reply

  • 1,160 POSTS

Yes. Shim the started or at least check to see if it needs to be shimmed. Look at the flywheel to see if its' teeth look as if the starter is grinding them.

If you hear a high pitched whining or clanking while cranking (before engine starts), this would indicate that there is too much clearance between the flywheel and starter.
To correct this, start with a.015" starter shim. Cut it in-half an place it on the outside starter bolt (the one farthest from the engine) [between the starter and the engine block]. This will move the starter closer to the flywheel.
If the sound persists, use the next thickest shim (again cutting it in-half). Repeat a third time if necessary - If that doesn't correct it, remove the starter and inspect the engine and starter for abnormalities).

If you hear a high pitched whine after the engine starts, as the key is being released, this indicates that the starter is too close to the flywheel. To correct this do the opposite of the above information (place the.015" shim half under the inside bolt [between the starter and the engine block]) Increase shim thickness as needed.

Let me know how this goes.

Oh yeah, make sure that you are using the factory type starter bolts.

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Tuesday, March 29th, 2016 AT 4:59 PM

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