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Tool Talk Discussion Forum

Exaust valve not intake

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Jak

06-02-2006 08:07:07




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Upon dissasembly it was the exaust valve stuck on the 10 hp OHV Briggs instead of the intake.I took the head off and it is brown(burnt looking)around the valve spring.There was carbon around the valve spring and on the valve stem.The valve is loose in the guide.I wonder if the exaust gasses are traveling up the stem depositing carbon.She sure looks like it is getting extremely hot in that area.




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jdemaris

06-03-2006 05:36:57




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 Re: Exaust valve not intake in reply to Jak, 06-02-2006 08:07:07  
I don't know much about the newer overhead-valve engines from Briggs & Stratton. Do they actually make them? I remember when the Vanguards came out, and they were foreign made - maybe by Subaru - I'm not sure. At the time Subaru was making the Wisconsin "Robin" engines. To my point - I attended many small engines schools for Briggs & Stratton, Kohler, Tecumseh, Wisconsin, Deere, etc. from the late 60s to late 70s. We had MANY problems with exhaust valves getting stuck - mostly with the 8 and 10 horse Briggs and the 10 and 12 horse Kohlers. Many were being run on leaded gas - as well as unleaded.
With the 10 horse Briggs - besides the exhaust valves getting stuck in the guide, we had miserable problems with the seat coming loose in the aluminum block. Briggs offered no remedy - they were happy to sell new shortblocks. Then - Honda came out with their first replacement 10 horse engine - targeted to directly compete with the Briggs 10 horse. There was no comparison - they were MUCH better engines with zero problems. Seems that was early to mid 70s. After that, US small engine companies actually started doing some work to improve their US built engines. Funny thing is - they already had much better engines that they only sold overseas. At the time of the sticking valves - we got some advice from Kohler and we used it on all the engines with valve problems. Clearance on the valve-guide was either increased - or reamed out and a bronze guide installed - and an exhaust valve of a different alloy was used. With Kohler and Briggs - they both offered a sort of "super duty" premimum exhaust valve as an option for severe duty - but I don't recall if it was simply stellite, or sodium-filled, or whatever. The point is - it had less of an expansion rate than the standard valve - and that is critical in an air-cooled engine. It fixed the problem.

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Jon Hagen

06-04-2006 21:25:32




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 Re: Exaust valve not intake in reply to jdemaris, 06-03-2006 05:36:57  
Do a google search using Briggs & Stratton and Generac as the search words. I did that a few months ago after the local Briggs dealer told me that Briggs had bought Generac. It turn out he was correct,Briggs now owns Generac,and an odd tidbit that turned up is that Generac designed their own new line of engines before the buyout,which after Briggs purchaced the company,became the Briggs Vanguard engine series.

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RN

06-02-2006 13:44:32




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 Re: Exaust valve not intake in reply to Jak, 06-02-2006 08:07:07  
Knurl valve guide before reassembly, use Lubriplate on valve stem (grease), lap valve seat. Racing oil or semi-synthetic oil, use wide range for valve lash adjustment-if lash is .10 to .16 gap try for 16. RN



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supergrumpy

06-02-2006 13:35:05




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 Re: Exaust valve not intake in reply to Jak, 06-02-2006 08:07:07  
I keep seeing comments on the other small engine forums about newer engines running lean, some engines have no carb adjustments so the boys drag out the number drills

they tend to blame the EPA, from the hassle Briggs is getting re future products it looks to get worse

soapbox is now put away, seems like you will have an ongoing project with this engine, the idea of cutting your losses and getting a new motor sounds good unless you have unlimited time to tinker

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Jak

06-04-2006 08:00:39




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 Re: Exaust valve not intake in reply to supergrumpy, 06-02-2006 13:35:05  
Well I work for higher education and the way they see it is to repair,repair,repair.Save money/cut back/do more with less and so forth and so on,you know how the scenerio goes.We did however switch over to Red Max weedeaters from Homelite a few years back which was more expense on the front end but worth it in the long run.



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KeithF

06-02-2006 13:22:38




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 Re: Exaust valve not intake in reply to Jak, 06-02-2006 08:07:07  
If the carburation system is running too lean, it can really heat up the valves and even make the muffler glow red. The timing needs to be close also on those small engines. Just a thought.



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Bob

06-02-2006 09:19:16




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 Re: Exaust valve not intake in reply to Jak, 06-02-2006 08:07:07  
Clean it up. Run a good synthetic oil. Make sure cooling air system is free of debris.



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Jak

06-02-2006 10:17:49




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 Re: Exaust valve not intake in reply to Bob, 06-02-2006 09:19:16  
10/4 Bob.The exaust valve stem is worn quite a bit.This engine is 1 1/2 years old.The older engine broke the crankshaft then under warranty they replaced it with this one.Not such a good track record so far.



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buickanddeere

06-02-2006 09:16:57




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 Re: Exaust valve not intake in reply to Jak, 06-02-2006 08:07:07  
Check the price of a new engine with warrenty at various internet shops selling new engines. It's often cheaper to get all new everything instead of patching up something then just having a used/repaired engine. www.smallenginewarehouse.com



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