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timing marks

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tomstractor
5+ Years
5+ Years
Posts: 129
Joined: Mon Sep 04, 2017 11:12 am
Zip Code: 01007
Tractors Owned: 49 Cub,57Cub, 57 Low Boy, 48 BN, 48 Ford8N, 49Ford 8N, 56 Massey Harris 50, 58 MF 65, 77 MF 265
Circle of Safety: Y
Location: Belchertown, MA

timing marks

Postby tomstractor » Thu Sep 14, 2017 2:07 pm

I need to set the timing on my 49 Cub. The book says to line up the mark on the front
pulley so the impulse snaps as it reaches the mark. My pulley has 2 marks about 3/4 inch apart.
Which one do I use? Thanks, Tom

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John *.?-!.* cub owner
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Posts: 23701
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: timing marks

Postby John *.?-!.* cub owner » Thu Sep 14, 2017 2:16 pm

The second mark is the TDC mark, first one is 16 degrees before TDC. Your pulley has been replaced, on a 49 it would have originally had the TDC mark only. Looks like I made that as clear as mud. For a magneto or static timing a distributor use the second mark. If you have a distributor and are timing it with a light, use the first mark.
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