Big Timing Gear

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blgitn
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Big Timing Gear

Post by blgitn » Sun Oct 18, 2020 10:00 pm

Can anybody identify the metal timing gear pictured? The number on it is: T415B and looks to be in pretty good condition. I can't locate any reference to that number.

Given the choice, would you install the used metal one of the new nylon one?

R/ Roger.
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Steve Jelf
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Re: Big Timing Gear

Post by Steve Jelf » Sun Oct 18, 2020 10:28 pm

415B is the factory number for part #3047B. The parts book says you can use it for all years 1909-1927.
After my bad experience with the failure of a nylon timing gear I would not have another. The same goes for fiber. You can use the original if it's in good condition, or go with bronze (best choice) or aluminum.
The inevitable often happens.
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RajoRacer
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Re: Big Timing Gear

Post by RajoRacer » Sun Oct 18, 2020 10:34 pm

The steel 4 spoke was the first helical gear following the straight cut cam gear. I'm assuming following the introduction of the Ford electric starting system.

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Re: Big Timing Gear

Post by RajoRacer » Sun Oct 18, 2020 10:35 pm

And, I would use the steel gear, given the choice !


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Re: Big Timing Gear

Post by Kerry » Sun Oct 18, 2020 10:41 pm

Looking at it will not tell you much, needs to be fitted for a check of lash.


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Re: Big Timing Gear

Post by jiminbartow » Sun Oct 18, 2020 11:43 pm

The only downside to a steel gear is that it is noisier than the non-steel gears. I will take noisier, any day, over a propensity to break and lose teeth like the non steel gears do. Jim Patrick

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Re: Big Timing Gear

Post by Steve Jelf » Mon Oct 19, 2020 12:12 am

It's a Model T. You won't hear the timing gear over all the other noises. :D
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Re: Big Timing Gear

Post by Alan Long » Mon Oct 19, 2020 8:29 am

Agree, agree, agree. I too would prefer the noise of a steel gear set over the alternative of a dead engine due to tooth failure.
I believe steel is 100% necessary if running a generator.
Alan in Western Australia


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Re: Big Timing Gear

Post by John Codman » Mon Oct 19, 2020 10:43 am

I have probably replaced 50 timing gears in modern cars. In every case the change was necessary because the nylon gear failed. If there is any reasonable alternative, I will never install a nylon timing gear. I have also never noticed any difference in the sound of the steel gear as opposed to the nylon gear (actually there was a difference in noise - with the failed nylon gear the engine would not run. With the steel gear installed it would).

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Re: Big Timing Gear

Post by Mark Gregush » Mon Oct 19, 2020 11:28 am

And to counter with; when I lost my center main, also broke some of the teeth off the nylon gear, except; only took the top part off some of the teeth and cracked others, the car still ran. The lost teeth were still about 1/2 there and there were cracks were about 1/2 way down the on others. When this happened, I was operating outside my norm. Tried to shift the Warford from underdrive to direct at too high RPM while still on a slight incline. While I may have stripped the remaining 1/2 cracked teeth off later(?), I was able to drive the car off the road before loading on trailer and when got home into the shed.
I know the voices aren't real but damn they have some good ideas! :shock:

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Re: Big Timing Gear

Post by Original Smith » Mon Oct 19, 2020 11:33 am

There are two types of Ford steel helical gears. Four spoke, and three spoke.


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Re: Big Timing Gear

Post by blgitn » Mon Oct 19, 2020 4:14 pm

Ok, thanks. Steel it is! I'll check the backlash when I get it together.

Anybody need a nylon one?

R/ Roger.


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Re: Big Timing Gear

Post by Les Schubert » Mon Oct 19, 2020 4:43 pm

I’ll take the nylon gear. I’ve run various fiber and nylon gears for 48 years without a problem. But I am scrupulously careful about 100 mm cam to crank spacing and generator gear lash.


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Re: Big Timing Gear

Post by Dan Hatch » Mon Oct 19, 2020 5:00 pm

Was there not a thread a few years ago about some nylon gears made with the wrong angle on the gears. This is what caused the teeth to shear off. Dan

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Re: Big Timing Gear

Post by Mopar_man » Tue Oct 20, 2020 10:26 am

Steve Jelf wrote:
Mon Oct 19, 2020 12:12 am
It's a Model T. You won't hear the timing gear over all the other noises. :D
Ha!! This is so true.


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blgitn
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Re: Big Timing Gear

Post by blgitn » Tue Oct 20, 2020 7:04 pm

Les Schubert wrote:
Mon Oct 19, 2020 4:43 pm
I’ll take the nylon gear. I’ve run various fiber and nylon gears for 48 years without a problem. But I am scrupulously careful about 100 mm cam to crank spacing and generator gear lash.
I'll keep you in mind, Les.

R/ Roger.


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Re: Big Timing Gear

Post by Allan » Tue Oct 20, 2020 7:29 pm

I read somewhere that some consider the 4 spoke steel gears to be superior to the later 3 spoke type. I can't remember the details. I wonder if all the replacement nylon/fibre/whatever are used for any other reason than either cheapness or noise reduction. My preference has always been for a new steel crankshaft gear and an aluminium timing gear.

Allan from down under.

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