The Ford Barn

Biggles · 07-30-2019, 08:22 AM

One of my aluminium timing gears is stamped "+003".
Has it been drilled to give 3 degrees advance to the camshaft, or what?

[IMG]

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Mart · 07-30-2019, 08:33 AM

Hi Neil. As it is quoted in thou rather than degrees would it be more intuitive to assume it might be to cope with a block that has been line bored and has had the crank bore raised by .003"?

Just guessing, mate, but while I do believe gears exist for such a scenario, I don't know how they would be marked.

Mart.

Charlie ny · 07-30-2019, 08:53 AM

Big,
The pitch diameter of the gear is .003 over the mean size. This would perhaps
'tighten up' excessive lash..........maybe.
Charlie ny

flatjack9 · 07-30-2019, 11:05 AM

It is .003 oversize.

Mart · 07-30-2019, 11:29 AM

That does make more sense.

Mart.

Tim Ayers · 07-30-2019, 12:12 PM

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Seems odd that this even exists. So the crank gear is worn so you put on a larger cam gear?

flatheadmurre · 07-30-2019, 12:31 PM

Yep i have them in .006 to...easier to change to a oversize camgear then change the gear on the crankshaft...

Tim Ayers · 07-30-2019, 12:36 PM

Quote:

Originally Posted by flatheadmurre

Yep i have them in .006 to...easier to change to a oversize camgear then change the gear on the crankshaft...

I guess so.

Biggles · 07-30-2019, 01:01 PM

Thanks, Barners.

Kube · 07-30-2019, 01:53 PM

Quote:

Originally Posted by flatjack9

It is .003 oversize.

This is correct. These were quite common many years ago.

Ol' Ron · 07-30-2019, 06:17 PM

Back in the day, blocks were milled over the Main bores to fit new caps, then line bored to a standard size, THus the Smaller gear. When I did this, I made a fixture to cut the caps. I took .005" off the cam and aligned the block, cutting only a few tents from the block. Then you could use a standard timing , Willbe using it soon have a Good block with no caps????? gear

07-30-2019, 08:22 AM	#1
Biggles Member Join Date: Oct 2010 Location: Cotswolds, England Posts: 72	+003 Timing Gear One of my aluminium timing gears is stamped "+003". Has it been drilled to give 3 degrees advance to the camshaft, or what? [IMG][/IMG]

07-30-2019, 08:33 AM	#2
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,744	Re: +003 Timing Gear Hi Neil. As it is quoted in thou rather than degrees would it be more intuitive to assume it might be to cope with a block that has been line bored and has had the crank bore raised by .003"? Just guessing, mate, but while I do believe gears exist for such a scenario, I don't know how they would be marked. Mart.

07-30-2019, 08:53 AM	#3
Charlie ny BANNED Join Date: May 2010 Posts: 3,019	Re: +003 Timing Gear Big, The pitch diameter of the gear is .003 over the mean size. This would perhaps 'tighten up' excessive lash..........maybe. Charlie ny

07-30-2019, 11:05 AM	#4
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,525	Re: +003 Timing Gear It is .003 oversize.

07-30-2019, 11:29 AM	#5
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,744	Re: +003 Timing Gear That does make more sense. Mart.

07-30-2019, 12:12 PM	#6
Tim Ayers Senior Member Join Date: May 2010 Location: NJ Posts: 6,177	Re: +003 Timing Gear Sponsored Links (Register now to hide all advertisements) Seems odd that this even exists. So the crank gear is worn so you put on a larger cam gear?

07-30-2019, 12:31 PM	#7
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: +003 Timing Gear Yep i have them in .006 to...easier to change to a oversize camgear then change the gear on the crankshaft...

07-30-2019, 01:01 PM	#9
Biggles Member Join Date: Oct 2010 Location: Cotswolds, England Posts: 72	Re: +003 Timing Gear Thanks, Barners.

07-30-2019, 06:17 PM	#11
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,855	Re: +003 Timing Gear Back in the day, blocks were milled over the Main bores to fit new caps, then line bored to a standard size, THus the Smaller gear. When I did this, I made a fixture to cut the caps. I took .005" off the cam and aligned the block, cutting only a few tents from the block. Then you could use a standard timing , Willbe using it soon have a Good block with no caps????? gear

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