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Topic: Wear on Timing Gear

in Forum: C3 Engines


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Wear on Timing Gear (1/4)
 10/18/09 5:32pm
jp75vette
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Bloomfield Hills, MI - USA

Vette(s):
1975 Corvette coupe, 4 speed manual, 383 ci 9.5:1,Edelbrock dual plane Air Gap intake, Alum Heads,Comp Cam, roller Rockers, PS,PB,Tilt


Joined: 6/29/2008
Posts: 199

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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Wear on Timing Gear (2/4)
 10/18/09 7:10pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

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


Joined: 11/8/2003
Posts: 20129

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?


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Joel Adams
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Wear on Timing Gear (3/4)
 10/19/09 8:01am
jp75vette
Former Member

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Bloomfield Hills, MI - USA

Vette(s):
1975 Corvette coupe, 4 speed manual, 383 ci 9.5:1,Edelbrock dual plane Air Gap intake, Alum Heads,Comp Cam, roller Rockers, PS,PB,Tilt


Joined: 6/29/2008
Posts: 199

It's a 4 speed manual

Wear on Timing Gear (4/4)
 10/19/09 8:15am
Adams' AppleLifetime Member
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Duncanville, TX - USA

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


Joined: 11/8/2003
Posts: 20129

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.


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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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