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Farmall & IHC Tractors Discussion Forum
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Timing on the 100

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rnicholas

05-19-2008 18:14:22




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About to fire up my restored 100 but then I noticed that the replacement pulley (I broke the old one getting it on) did not have a timing mark on it. Nothing on the flywheel. Other than guessing at the top of the stroke on #1 what do I do to make a more accurate beginning?




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rnicholas

05-20-2008 06:20:39




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 Re: Timing on the 100 in reply to rnicholas, 05-19-2008 18:14:22  
Thanks guys. Even when there's a fuss, you guys provide more info than all the manuals ever printed.



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Hugh MacKay

05-20-2008 17:54:53




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 Re: Timing on the 100 in reply to rnicholas, 05-20-2008 06:20:39  
rnicholas: When I do my timing advance, the final setting is done in the field, preferably when tractor is working up to it's rated hp. I take a 1/2" wrench with me, make small changes, listening to sound and comparing that with when it pulls best. You soon get so you get it right or very close right at the shop. It takes a bit of practice, but that's what makes you perfect.



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georgeky

05-19-2008 21:36:11




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 Re: Timing on the 100 in reply to rnicholas, 05-19-2008 18:14:22  
You don't have to guess at the top of stroke. Shine a light through the plug hole, and you can watch the piston come up. I usually just stick a piece of stiff wire in there on top of piston, and feel it coming up.



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Hugh Mackay

05-19-2008 19:13:08




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 Re: Timing on the 100 in reply to rnicholas, 05-19-2008 18:14:22  
rnicholas: You don't need anything more accurate than TDC. I've been working on these since 1958, have never seen a timing mark yet. Oh, they are on there, I just never pay any attention to them. What good is the mark unless know whether it's compression or exhaust, and you got to take the plug out for that.

As far as timing advance goes, set your distributor on No.1 when No.1 piston is at TDC on compression. It will always start, and from there any C-113 or C-123 will talk to you for fine tuning. It may take a spell, but you'll get used to the sound of perfect timing advance. I quite regularly get called on to fine tune engines that were set with a light. The ear is faster than the eye.

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