Cam gear question?

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Model T Ford Forum: Forum 2013: Cam gear question?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Diederich on Tuesday, August 20, 2013 - 07:27 pm:

I had a cam gear stripe four teeth Sunday. I exchanged the defective gear for a aluminum gear and had it drilled for 7.5 advance.
I have several questions.
1- the new gear is about a quarter of an inch forward of the crank gear is this ok? 2_As I replaced the gear I found the crank shaft seal is loose can I loosen the pan bolts and lift the engine enough to change the seal?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Kerry van Ekeren (Australia) on Tuesday, August 20, 2013 - 07:34 pm:

Something doesn't sound right, I don't think there's enough room in the timing cover and block to have a 1/4" out of mesh on the gears, as for dropping the pan to replace the seal, you'll end up with a stuffed gasket and some dad oil leaks.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Les Schubert on Tuesday, August 20, 2013 - 09:53 pm:

I agree with Kerry. Also what do the crank gear and generator gears look like?

Seal; did you have a significant oil leak at the front before? If not maybe don't fix it? What type of seal is it?

I assume you have a front cover alignment tool (your own or borrowed). It is very important to have the front cover as close to perfectly centred on the cam shaft to get correct spark timing for proper performance.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mike Bender Tulsa Oklahoma on Tuesday, August 20, 2013 - 10:55 pm:

The cam gear is located on the two pins from the cam shaft flange, held in place by the cam nut.

Clearance between the front plate and the cam gear would be measured in thousandth of an inch. Gear would be real close to flush with mounting surface for the front plate.

Make sure the the back of the cam gear is in contact with the flange on the front of the cam.

The front cam bearing will stick out normally from the cam bearing bore but not a whole lot, less than a 1/32 to almost flush with the block.

When you removed the old gear did the cam slide forward if so, did you remove the two bolts on the side of the engine block that keep the front and middle cam bearings in place, Removing the cam bearing bolts is not necessary to change the gear, but would let the cam slip forward. If not you have a problem with the thrust of the front bearing, the hole for the bearing lock bolt is elongated, maybe a reground early (long front bearing) cam without a thrust kit and the exhaust lobe of the cam has slipped into the notch of the cam bearing when removing the old gear.

All of the above assumes you did not remove the cam to replace the gear.


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