12-tooth starter question
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Mountain Pass
Joined: Oct 2009
Posts: 214
Likes: 7
From: East Tenn
12-tooth starter question
So my starter on my Excursion finally stopped doing its job after 255k miles and I looked for a replacement, reading several threads on here. I eventually decided to buy one of the Denso Chinese clones off of Amazon after making sure the model number met their criteria for replacement. I installed it and it starts the truck up at an incredible rate compared to the failing OEM. Only after a few days did I think to look at the OEM starter and saw that it had a 12-tooth gear. The replacement has 13 teeth. 
So despite their model number check, I managed to install a 13-tooth starter where the 12-tooth had lived.
The only question I have is whether or not the different pitches of the gears will be a problem for the flywheel? I've already missed the return window for the new one and I'm thinking of getting the OEM refurbished locally and putting it back on if the tooth difference is a problem.
Thoughts?
So despite their model number check, I managed to install a 13-tooth starter where the 12-tooth had lived.The only question I have is whether or not the different pitches of the gears will be a problem for the flywheel? I've already missed the return window for the new one and I'm thinking of getting the OEM refurbished locally and putting it back on if the tooth difference is a problem.
Thoughts?
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,136
Likes: 4,732
From: Henderson, NV
Is the 13-tooth larger diameter (the gear diameter, not the motor) than the 12-tooth? Tooth pitch doesn't necessarily change just because the tooth count is different.
I think you're okay if it's spinning your engine well. Incorrect tooth pitch would have caused major issues when it engaged with your flywheel/flex plate.
I think you're okay if it's spinning your engine well. Incorrect tooth pitch would have caused major issues when it engaged with your flywheel/flex plate.
Lead Driver
Joined: Apr 2011
Posts: 8,259
Likes: 346
From: Northern California
Fwiw the Offset reduction gear starter from AutoZone comes with a lifetime warrantee, they have new or remans, I chose the new.
It wouldnt have been my first choice but my OEM failed on a road trip so I got what was available.
that was 7-8 years ago now ? as much as I would want a real denso the Autozone version has been a champ.
It wouldnt have been my first choice but my OEM failed on a road trip so I got what was available.
that was 7-8 years ago now ? as much as I would want a real denso the Autozone version has been a champ.
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
I have a second hand offset reduction starter that I had rebuilt by my local rebuilder. He was unable to determine if it was a genuine Denso or a knock-off. I prefer genuine stuff just because that's the way I am but if he couldn't tell the difference that tells me something.
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Mountain Pass
Joined: Oct 2009
Posts: 214
Likes: 7
From: East Tenn
Is the 13-tooth larger diameter (the gear diameter, not the motor) than the 12-tooth? Tooth pitch doesn't necessarily change just because the tooth count is different.
I think you're okay if it's spinning your engine well. Incorrect tooth pitch would have caused major issues when it engaged with your flywheel/flex plate.
I think you're okay if it's spinning your engine well. Incorrect tooth pitch would have caused major issues when it engaged with your flywheel/flex plate.
Lead Driver
Joined: Apr 2011
Posts: 8,259
Likes: 346
From: Northern California
the Smaller 12 tooth gear was chosen to because it turns your flywheel quicker, The tooth count fits your flywheel fine.
Comparing your old gear diameter with the new one isn’t the important dimension, The dimension from mounting surface to the root of the gear is your concern. However if it didn’t fit you would have either not been able to install it ( to large ) or it would grind when turning over ( to small )
Comparing your old gear diameter with the new one isn’t the important dimension, The dimension from mounting surface to the root of the gear is your concern. However if it didn’t fit you would have either not been able to install it ( to large ) or it would grind when turning over ( to small )
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