Starter question for everyone

notjustair

Well-known Member
I've never understood this. I consider myself pretty savvy, but this one stumps me.

A starter is just a high torque electric motor. If you bench test it you get an electric motor in a vise. A little whirling noise but that's it.

Why is it that changing a starter can completely change the way something sounds when it starts? I'm not talking about cranking speed. I'm talking about sound while the engine is revolving.

If an engine cranks slower or faster (depending on the charge of the battery) it sounds basically the same just the speed changes. If you put a new or rebuilt starter in something it can totally change the way it sounds to the point that you wouldn't recognize it's your vehicle if you weren't turning the key.

I'll never forget how much my dad's friend's 68 Chevy pickup changed when he put a new starter on it. It was so destinctive with the original. I was disappointed with the new sound.
 
Gear mesh between the bendix and the ring gear. The old ones will be worn together in a particular way and then the new gear and the old gear will mesh differently.
Zach
 
Correct. Also the depth of the mesh. Particularly Chevys of that vintage. Not many people know that they made spacers of different thickness that went between the starter and block to correct a situation just as described above.
 
Starter mounting on that model truck was as big mess. Had the bolts going in from the bottom and they would work loose. Several service bulletins and latter they even put a brace kit on the back. As the other posters have noted all about gear spacing.
 
If you didn't shim the starter correctly on a Chevy, it would be quite noisy. And if it was too tight, the starter would likely fail in a week or two. Many mechanics would put all the shims in, figuring better too loose than too tight.
 
you guys are buying rebuilt junk. houseings are Machined to tru them reqiring shims to mate. no chevy came new with any shims. RENE'
 
Sorry Bubba but bought three new 2500 cheveys in 1969 for our business. EACH one had shims fromm the factory and the starters were a pain as well as the transmissions, sold them all three within a year and have never owned Chevy since. Besides the starters the doors fell off or hinges wore out, beds rusted thru right above the wheels and the list goes on. What ever the big hot motor was then something like a 400 . They were really supposed to be THE truck.. All they were for me was a high price mistake.
 

Remember the high pitch sound the Chrysler product starters made back in the 60s? Way different from Ford and GM.
 
that's because they had a reduction gear in them , and it made that whine . and the starters lasted longer also.
 
Friend that was a retired GM employee explained if it wasn't for shims and plastic zip ties GM couldn't build a car.
 
No, it was a few years before the reduction starters that had that whine. They turned the engine over just fine too.
 

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