Checking a mag on a 48

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wrz
Posts: 43
Joined: Sun Jun 01, 2014 8:41 am
Zip Code: 85233
Tractors Owned: 47 Fcub
51 Fcub
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59 Lo Boy FH 45 Loader
Location: AZ,Gilbert

Checking a mag on a 48

Postby wrz » Wed Oct 26, 2016 6:35 pm

The head is off and am turning the engine over with just the fan by hand. The mag snaps only when 1 and 4 pistons are at the top of the compression stroke. Why can I hear the mag snap on 2 and 3 compression stroke. The mag is not producing any spark which is another issue.
Wm

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John *.?-!.* cub owner
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Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
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Re: Checking a mag on a 48

Postby John *.?-!.* cub owner » Wed Oct 26, 2016 7:14 pm

wrz wrote:The head is off and am turning the engine over with just the fan by hand. The mag snaps only when 1 and 4 pistons are at the top of the compression stroke. Why can I hear the mag snap on 2 and 3 compression stroke. The mag is not producing any spark which is another issue.
Wm
The mag has 2 pawls and springs, one will trip for 1 & 4, and the other on 3 & 2. I suspect one of them is stuck or the return spring broken.
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