Large Timing Gear stupid question

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Model T Ford Forum: Forum 2015: Large Timing Gear stupid question
Top of pagePrevious messageNext messageBottom of page Link to this message  By John Eaton on Saturday, January 31, 2015 - 11:12 am:

After some study I believe I know the answer but here it is. Does it matter which way the larger gear goes on to the cam shaft in reference to the two pins and the hole in the end. When I line up the timing marks the cam can go either of two locations 180 degrees apart. I need reassurance that there is no difference.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ken Todd, ............Red Deer, Alberta on Saturday, January 31, 2015 - 11:18 am:

Either way, doesn't matter.


Top of pagePrevious messageNext messageBottom of page Link to this message  By John Eaton on Saturday, January 31, 2015 - 11:28 am:

Thanks Ken, That is what I thought it inferred in the books.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Frank van Ekeren (Australia) on Saturday, January 31, 2015 - 04:33 pm:

Well it does, depending on what cam you are using, if using an early cam that has the timer pin hole go right through, you need to check that the cam is at No 4 TDC to fit the pin from the top or it could be 180 degrees out to the wiring.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jerry VanOoteghem - SE Michigan on Saturday, January 31, 2015 - 05:23 pm:

Frank, that still doesn't make any difference which way the timing gear goes on. It only matters which way the timer rotor goes on.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Frank van Ekeren (Australia) on Saturday, January 31, 2015 - 05:31 pm:

Jerry, true, but in relation to the pin hole alignment and the timing marks on the gears the cam can still be 180 out if you don't check.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Stephen D Heatherly on Saturday, January 31, 2015 - 06:57 pm:

No, it does not matter, not even with an early cam.

Stephen


Top of pagePrevious messageNext messageBottom of page Link to this message  By Frank van Ekeren (Australia) on Saturday, January 31, 2015 - 07:24 pm:

Stephen, if you fit a cam with the timing marks lined up, the 1/2 way drilled pin hole will always be your #1 but if you flip the early cam 180 then #4 is TDC when you fit the timer roller if you don't rotate the crank back to #1, you have the wrong firing order.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Stephen D Heatherly on Saturday, January 31, 2015 - 08:22 pm:

As long as the timer roller is installed in the correct position in relation to the cam lobes the ignition timing will be correct despite timing gear orientation. If the ignition timing is 180 off it's because you installed the timer roller wrong not the timing gear.

Stephen


Top of pagePrevious messageNext messageBottom of page Link to this message  By Frank van Ekeren (Australia) on Saturday, January 31, 2015 - 08:54 pm:

Stephen, your missing the point in relation to the question, yes you are right but, it's a no brainer for several million T's, it can go together with cam either way, but we don't use the timing marks on the other side of the gears, but if confronted with the other millions, then you have to watch what you are doing as you line up the marks, you can't assume that the cam is correct for timing the roller like the later ones, affectively the cam can be 180degrees out and corrected by rotating the timer roller 180 degrees.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Kohnke Rebabbitting on Saturday, January 31, 2015 - 09:05 pm:

Ford installed the cam gear timing mark opposite the toe on the first lobe of any cam.

Herm.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Stephen D Heatherly on Saturday, January 31, 2015 - 09:29 pm:

All you would have to do is bring number one up on compression and stop when the piston reaches TDC. Put the roller on the camshaft so that the roller is at the top left and put in the pin. It matters not how the gear is installed, just the roller.

Stephen


Top of pagePrevious messageNext messageBottom of page Link to this message  By Hal Davis-SE Georgia on Sunday, February 01, 2015 - 06:52 pm:

A cam CANNOT be out 180 degrees. It is "180 degrees out" every revolution of the crankshaft. Don't believe it? Put the cam gear on with the marks aligned correctly, then turn the crankshaft one full turn. Wuddayagot? A cam shaft that is "180 degrees out". Turn the crankshaft another full turn and your right back where you started.


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