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Garden Tractors Discussion Forum

18 hp briggs cam repair?

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George Marsh

11-01-2013 13:48:35
50.121.112.194



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Is it possible to repair the decompression part of cam or do you have to replace the entire cam?

Is there a place on where I can buy a cam and gaskets cheaper than $150 for both?

Never had to replace cam on briggs. Can I get by splitting the block or is it more like removing the head, rod?

Would I need an entire overhaul gasket set or can I buy just the gaskets I need?
Thanks.
George

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joe csuti

11-01-2013 18:02:06
4.248.94.67



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 Re: 18 hp briggs cam repair? in reply to George Marsh, 11-01-2013 13:48:35  
The acr cam is usually part of the complete cam assembly,get mod/spec# of eng & goto link below,lookup mod/spec# of eng in briggs eng listings,see if acr listed seperate from cam,if not then write down pn for cam,goto ebay & enter briggs cam in search & check if any new/used cams your pn listed,also do a goggle search for briggs + pn of acr(if seperate)or cam pn & do some online shopping for prices,gaskets are avail seperate or complete set,at most you'll probably only need sump gasket & shaft seal if you choose to replace when case split.

To remove cam,turn eng on flywheel side,support eng so it doesn't move around & flywheel cover clear of bench/floor,remove oil sump,rotate crank till crank/cam timing marks line up,loosen rocker arms so valves are not putting pressure on rockers,pushrods & tappets,pull cam out of block.

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joe csuti

11-01-2013 18:17:42
4.248.94.67



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 Re: 18 hp briggs cam repair? in reply to joe csuti, 11-01-2013 18:02:06  
After re-reading your post,if you get no movement on either valve,the cam gear is probably broken or teeth broken on gear,on many mod briggs eng the cam gear is plastic/nylon.



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George Marsh

11-04-2013 18:14:33
50.121.112.194



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 Re: 18 hp briggs cam repair? in reply to joe csuti, 11-01-2013 18:17:42  
Joe, the cam gear is OK. The decompression part on cam is not plastic. Found a few pieces of the decompression part. Definately a problem.

Also having a problem findin pn for the sump gasket. Any help is appriciated. There are 12 bolts holding the sump on.
George



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JT

11-01-2013 17:36:40
68.53.181.110



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 Re: 18 hp briggs cam repair? in reply to George Marsh, 11-01-2013 13:48:35  
what model 18hp do you have? If it is a single cylinder, then you removed the push rods, removed bottom cover and take cam out? Are you sure it has a bad cam and don't just need valves adjusted? They get out of adjustment pretty easy and when that happens, compression release does not function. Valve clearance is .004.



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George Marsh

11-01-2013 17:51:09
50.121.112.194



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 Re: 18 hp briggs cam repair? in reply to JT, 11-01-2013 17:36:40  
Yes, I'm 100% sure it has a bad cam. Yes, it's a single cylinder. Nice to know all I'll need is the engine gasket and not the set.

I've adjusted a few briggs engines, even my honda engine. I blue printed this engine so I knew for certain when it was on compression stroke. Absolutely, no movement in either exhaust or intake valve.

As for cam, can a cam from another single cylinder briggs be used, say a 14 hp?

Is there a cheaper source for a new cam?

Can the old cam be repaired?

Many thanks

george

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El Toro

11-02-2013 08:50:09
96.244.7.206



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 Re: 18 hp briggs cam repair? in reply to George Marsh, 11-01-2013 17:51:09  
Your local lawn mower shop may have a used cam. Ford and Chevy had that problem back in the 1950's. Some were replaced free. Hal



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JT

11-01-2013 17:47:22
68.53.181.110



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 Re: 18 hp briggs cam repair? in reply to JT, 11-01-2013 17:36:40  
George, someone seen you coming, lol, if it is a single cylinder Briggs engine, a new cam should be in the 75.00-80.00 range. The one I looked up for a 33 ci engine, sells for 72.99 for the cam and a 5.00 gasket and 4.40 for the lower seal, where I work at, email is open if you need help getting a little more reasonable camshaft



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George Marsh

11-01-2013 17:55:26
50.121.112.194



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 Re: 18 hp briggs cam repair? in reply to JT, 11-01-2013 17:47:22  
JT,
My local guy said the same thing, $80. He gave me the price for an entire gasket set, $60.

When I get time, I'll take engine apart and take a look see inside.

At this point friend doesn't want to put $150 in a used mower, when there are many on craigslist for $100-$200 range.

However, the rest of the mower has been well taken care of.

George



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