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Time an 18 hp briggs

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Geo-TH,In
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PostPosted: Tue Dec 24, 2013 1:33 pm    Post subject: Time an 18 hp briggs Reply to specific post Reply with quote

Got a new can for 18 hp single cylinder briggs. Cam gear has a dot on it. No Dot on smaller gear on crank. However there is a key way on crank to hold smaller gear in place. Going to guess that to time motor, the dot on the cam lines up with the key way on the crank. Am I right?

Also what is the valve clearance?

Model # is 31H7070????

Thanks,
George
 
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TomIN
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PostPosted: Tue Dec 24, 2013 2:57 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

First let me say than I'm not a Briggs mechanic.

I did a search on the model number you listed and it didn't match anything. As close as I can come is a model 31H707 series 0212 E1

The factory manual for this engine suggests an intake valve clearance of .003 to .005 and an exhaust valve clearance of .005 to .007

Another site recommended intake .004 to .006 and exhaust .007 to .009

I found several generic posts about Briggs crankshaft timing marks. They suggest that there should be a line engraved on the crankshaft BEHIND the crank gear (which is keyed to the shaft)
 
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Geo-TH,In
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PostPosted: Tue Dec 24, 2013 4:56 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

Tom,
Model is 31H7070212E1.

I'll look closer to a timing mark on crank. The gear on crank just slips on over a key in crank. Didn't see a mark on that gear, but I'll look even closer.

Thanks,
George
 
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huntingreen2day
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PostPosted: Tue Dec 24, 2013 5:23 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

Are you sure you did not slip the gear on backwards and the dot is on the inside?
 
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JD Seller
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PostPosted: Tue Dec 24, 2013 6:34 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

George: Some B&S cam drive gears do not have a dot on them. They just have one or two teeth with the corners ground off at a 45 degree angle.

I have never seen one that was not marked in some way. Dots, different teeth, slash lines,etc.
 
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TomIN
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PostPosted: Tue Dec 24, 2013 7:08 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

As I said, I'm an internet searcher rather than a mechanic.

The Briggs parts manual shows that the timing gear is part 697128. A search on that part number has quite a few hits. Some have pictures that show a timing mark.
 
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Geo-TH,In
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PostPosted: Tue Dec 24, 2013 7:42 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

You can't put the gear on backwards. One side of the gear acts like a thrust bearing.
 
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Steve@Advance
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PostPosted: Tue Dec 24, 2013 8:33 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

Just put the piston at TDC, and the cam in valve overlap (between exhaust and intake) position.
 
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Hobo,NC
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PostPosted: Wed Dec 25, 2013 4:46 am    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

Steve@Advance wrote:
(quoted from post at 08:33:12 12/25/13) Just put the piston at TDC, and the cam in valve overlap (between exhaust and intake) position.


What he said then maybe you can find were the reference mark is just to satisfy ya...
 
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Geo-TH,In
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PostPosted: Wed Dec 25, 2013 6:07 am    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

Many thanks to all. I found an ehow to video. It showed where they hide the timing mark, torque pattern and a few other things I wasn't aware of like the push rod for the intake is aluminum, exhaust is metal.

Have a MERRY CHRISTMAS.

Thanks again.
George
 
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whizkidkyus
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PostPosted: Wed Dec 25, 2013 3:24 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

George,

I know that you got it figured out ,but I have been told that there is a a dot just like on the one cylinders, but it is located under the crank gear instead of on top of it. I work on small engines, mostly on Briggs, but it"s mostly been on one cylinders instead of twins. Another small engine mechanic that i used to work with told me about the dot underneath the one cylinders.

Whizkid
 
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Geo-TH,In
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PostPosted: Wed Dec 25, 2013 9:20 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

Whizkid,
I'll look for the dot tomorrow. The video I watched showed a single cylinder, like mine, except it has an oil pump and filter. The video shows the small gear going on the crank first, then the cam is installed. When I put my old crank in engine to see how to put it back together, I had to install the cam first, then gear was flipped around so the smooth side was facing out, other wise I couldn't get the sump cover on all the way.

Hope the guy I'm doing this for free appriciates the work I'm doing.
George
 
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guido
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PostPosted: Thu Dec 26, 2013 10:14 am    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

Hello George Marsh,

The cam gear has a timing mark between the teeth, while the crank gear has the timing mark on a single tooth, just match the two..........

Guido.

 
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guido
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PostPosted: Thu Dec 26, 2013 11:12 am    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

Hello George Marsh,

I forgot to add that sometimes the timing mark is on the crankshaft counterweight. Either way should be clearly marked............

Guido.
 
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Geo-TH,In
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PostPosted: Thu Dec 26, 2013 3:15 pm    Post subject: Re: Time an 18 hp briggs Reply to specific post Reply with quote

Guido,
I found the very small tiny timing mark. Got new cam today. Installed it. Engine fired off. It also backfired throught carb. The ehow video I watched said intake is from .003-.005 1/4 after TDC. I put it at .003. I may try .005 tomorrow. It just doesn't sound right. Also set it up my old way, TDC, not 1/4 inch below TDC. May do some research and see what others say.
George

George
 
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