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Order Ford 841 Parts Online

Re: 841 timing marks only visible when #4 fires - huh?

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Author  [Modern View]

04-02-2014 20:03:17

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The pistons in cylinders 1 and 4 are both at TDC at the same time. If #1 is on compression stroke #4 is on exhaust stroke and vice versa.
I assume you are shining a timing light though the "window" in the block onto the flywheel? And the flywheel marks are illuminated by the light only when the light is connected to the #4 plug wire? When you connect the light to #1 plug wire the light does not flash? If this is all true then you are not getting any "fire" through the #1 wire to trigger the light and your engine is running on 3 cylinders.
Regardless of what's happening you can indeed set the initial timing using the #4 cylinder and verify that the advance mechanism inside the distributor is working by revving up the engine and confirming that the timing does advance.

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William Fissell

04-02-2014 22:23:34

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 Re: 841 timing marks only visible when #4 fires - huh? in reply to Texas!, 04-02-2014 20:03:17  
Hi, all,

Yep I get the light flashing on all spark plug wires, but when I peek through the hole at the timing marks, I only see them when the timing light is clipped to number 4, not at all when clipped to number one. Wires 1and 4 are diagonally opposite each other on the distributor cap and I verified tdc by feeling through the spark plug hole when the rotor was pointing at the #1 wire.

I see your point about points and it was maybe a dumb idea to blame the jitter on the rotor. But holy cats it"s jumping around.

Thanks for your help.


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04-03-2014 06:06:33

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 Re: 841 timing marks only visible when #4 fires - huh? in reply to William Fissell, 04-02-2014 22:23:34  
If the cam lobe for the points is worn it may be firing #1 late.

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William Fissell

04-03-2014 07:45:29

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 Re: 841 timing marks only visible when #4 fires - huh? in reply to sunbeam, 04-03-2014 06:06:33  
yep. not eager to buy a new dizzy...

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