Topic: Wear on Timing Gear
in Forum: C3 Engines
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While I had the oil pan off, I replaced the front seal, timing gear, timing chain, and crank gear.
Take a look at the wear on these teeth; is that normal?
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Duncanville, TX - USA
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
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Normal for one with any mileage. Time for replacements!
Might I suggest, while you're at this stage, replacing with a full roller chain/gears? The cost is not so much more than stock replacement gears/chain, but the benefits far outweigh the slight cost increase.
Is this a 4 speed or automatic?
Might I suggest, while you're at this stage, replacing with a full roller chain/gears? The cost is not so much more than stock replacement gears/chain, but the benefits far outweigh the slight cost increase.
Is this a 4 speed or automatic?
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Not surprising...
The reason I masked is that with a 4 speed(or any standard), wear on the timing chain/gears can be accelerated by using the lower gears as brakes, as in downshifting to slow the car. This makes the gears wear more from the tension(drive) on the gears going from one side to the other, if that makes any sense. It's the acceleration/deceleration of the chain on the gears. While you are moving, the chain has tension on it on one side. When you shift gears, the chain has a little slack in it for a second or two, so it wants to just sorta "flop". Then as you apply the throttle after the shift, the chain tightens up again. This tight/slack tension wears the gears more than it does on an automatic, so you'll normally see more wear on the gears with a standard trans, for the same mileage.
Using the trans to slow the car down also adds to the accelerated wear for the same reason...tension/slop/flop/tension.
Hope this makes some sense. The real point is that standard tranny cars will have more wear on the timing chain/gears than an automatic.
The reason I masked is that with a 4 speed(or any standard), wear on the timing chain/gears can be accelerated by using the lower gears as brakes, as in downshifting to slow the car. This makes the gears wear more from the tension(drive) on the gears going from one side to the other, if that makes any sense. It's the acceleration/deceleration of the chain on the gears. While you are moving, the chain has tension on it on one side. When you shift gears, the chain has a little slack in it for a second or two, so it wants to just sorta "flop". Then as you apply the throttle after the shift, the chain tightens up again. This tight/slack tension wears the gears more than it does on an automatic, so you'll normally see more wear on the gears with a standard trans, for the same mileage.
Using the trans to slow the car down also adds to the accelerated wear for the same reason...tension/slop/flop/tension.
Hope this makes some sense. The real point is that standard tranny cars will have more wear on the timing chain/gears than an automatic.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
in Forum: C3 Engines
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