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3 Hp Briggs Cam Timing


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#1 1978murray OFFLINE  

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Posted February 26, 2012 - 06:08 PM

well im starting to put together the 3 hp briggs project. But i ran into a little problem. There are no timing mark on the cam drive gear. I didnt notice this before i took it apart. any idea of how to time it

#2 trowel OFFLINE  

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Posted February 26, 2012 - 06:13 PM

http://www.youtube.c...e&v=tS5h0cVbL_w

http://www.google.co...ll8WgYgIEK74BfQ

Edited by trowel, February 26, 2012 - 06:14 PM.

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#3 caseguy OFFLINE  

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Posted February 26, 2012 - 07:03 PM

Thanks Trowel! That video makes it so easy a caveman could do it! I might even be able to figure it out! Reply #2 on the second link tells what to do if you can't find the marks. Very thorough reply!
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#4 trowel OFFLINE  

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Posted February 26, 2012 - 07:31 PM

Thanks, i try my best to be thorough, staightforwards and make it easy for everyone,
Less typing for me to do too :thumbs:
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#5 chris m OFFLINE  

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Posted February 26, 2012 - 08:33 PM

Thanks Trowel! That video makes it so easy a caveman could do it! I might even be able to figure it out! Reply #2 on the second link tells what to do if you can't find the marks. Very thorough reply!

I just saw a caveman and boy is he mad cause he still can't do it! :smilewink:

#6 trowel OFFLINE  

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Posted February 26, 2012 - 08:41 PM

Kind of like that geico commercial " so easy a caveman can do it "........(frustrated caveman stuggling with camshaft in background)

#7 1978murray OFFLINE  

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Posted February 28, 2012 - 02:59 PM

looked for marks there are no factory timming marks. When i got this engine the timing was to advanced. Idk how to time without marks

#8 caseguy OFFLINE  

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Posted February 28, 2012 - 09:06 PM

looked for marks there are no factory timming marks. When i got this engine the timing was to advanced. Idk how to time without marks


In the second post of the second link that trowel posted above were directions for timing without the marks. It's short, but simple:

...bring the piston to top dead center with magnet on flywheel at coil, set cam with both valves closed. done.



#9 1978murray OFFLINE  

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Posted February 29, 2012 - 04:41 PM

yea but that doesnt say wat valve opens first. or where to put the cam. both closed could mean any number or timing

#10 MH81 ONLINE  

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Posted March 02, 2012 - 09:35 PM

Maybe this video will help.


If you study the operation, the answer should be a little more evident.

Hope that helps.
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#11 DougT ONLINE  

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Posted March 03, 2012 - 07:20 PM

Most of the stuff I work on doesn't have timing marks. The way I time an engine is to watch the exhaust valve while turning the engine in the direction of rotation. It should fully close as the piston goes past top dead center. The intake valve should open at about the same time or shortly after as the piston starts down. The intake valve should close before the piston gets to the bottom. The next stroke up will be compression with ignition happening near TDC. As the piston goes down on the power stroke, the exhaust valve should open before it gets to bottom dead center. I tend to time more off the closing of the exhaust valve than the other positions but sometimes I'll move it a tooth either way and see what looks best. Just always make sure your turning it in the direction of rotation.
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