Funny noise when in Reverse - Toyota Yaris Forums

Edd · 06-17-2007, 01:38 AM

The noise you here is the clanking of teeth touching in a straight cut gear. It often sounds like a buzzing (I actually like the noise). If it's inconsistant or overly loud, you may want it checked.
Your forward gears are helical, this ensures quiet operation and the gear cannot come off sideways, making it more stable. They are engaged from the side with dog toothed syncronisers.
Helical Gear:

Straight Gear:

As you can see, there is the potential for a lot more free play in the straight cut gear.

EDIT: Sorry about the large picture sizes, I linked straight from the net and didn't resize. It makes it easier to see the difference though.

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06-17-2007, 01:38 AM	#20
Edd Drives: None Join Date: Mar 2007 Location: Australia Posts: 193	The noise you here is the clanking of teeth touching in a straight cut gear. It often sounds like a buzzing (I actually like the noise). If it's inconsistant or overly loud, you may want it checked. Your forward gears are helical, this ensures quiet operation and the gear cannot come off sideways, making it more stable. They are engaged from the side with dog toothed syncronisers. Helical Gear: Straight Gear: As you can see, there is the potential for a lot more free play in the straight cut gear. EDIT: Sorry about the large picture sizes, I linked straight from the net and didn't resize. It makes it easier to see the difference though.