Carburetor solonoids have replaced the fuel bowl nut on a lot of todays engines,from kohler,briggs tecumseh, kawasaki, onan and most of the others.The purpose is to shut fuel off from intake manifold when ignition key is switched to off position.The carb solonoid consists of two wires,a power wire and a ground wire.The solonoid itself controls a pin that retracts from the bottom of the carb fuel jet when ignition is turned on allowing fuel into carb and intake manifold,sometimes you can hear it click right before you turn ignition to engage starter.If you dont hear a click and engine wont start, then the solonoid could be bad.One way to check is to disconnect wires from bottom of solonoid, since they ususally plug into it, it is relatively simple to remove them and then unscrew solonoid from bottom of bowl, it helps if you discconnect fuel line from carb first to avoid gas spillage,after you have removed solonoid, plug wires back in to it and switch ignition on,you should see pin retract, if you dont then the solonoid is bad.To fix replace solonoid, or snip pin off even with threads and re insert solonoid as a bypass trick.One important note is that if you have a completely discharged battery and you jump engine off and take cables off the engine will possibly go dead, since solonoid needs electricity to work.For somephotos go to http://pass.smallenginetrblshtng.com and see safety switches.
Posted by under Lawn Mower Repair
Published on Wednesday 8th of February 2012 02:25:54 PM
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Older kohler engines, the ones that came on some of the older john deere and cub cadet models,side shaft models are still running,most have a set of points and condenser that a old ford 74 model and below would interchange with, and I have used them to replace them with,also the coil will interchange with them,less expensive than brand name, but just as good.
Posted by Some came with starters and some came with starter generators,a pricey item nowadays a starter generator.The valves are adjustable from the bottom end, by that I MEANthat they are inside head valves, but they have screw type adjustments inside the valve crankcase cover that sets behind the carb.A preliminary to what todays briggs overhead valve adjusts are.The old kohlers are tough engines,as well as the new models,amazing what roller bearings on each end of the crankshaft accomplishes as tothe longevity of a small engine. under Lawn Mower RepairThe actual fuel pumps on the side shaft models of yesteryear are actually the same as some of the newer models,its a minature mechanical pump, by that
Published on Wednesday 8th of February 2012 02:25:54 PM
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mower charging circuit
Posted by mitchell under Lawn Mower Repair
The charging circuit on todays small engines consists of the flywheel which has a set of magnets underneath it that when spinning rotate a
Published on Wednesday 8th of February 2012 02:25:54 PM
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17.5 tecumseh egines
Posted byunder Lawn Mower Repair
Whether you have a 17.5hp tecumseh, kohler, briggs, kawasaki or some other type engine on your riding lawn mower, the mower decks will be similiar and
Published on Wednesday 8th of February 2012 02:25:54 PM
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test lawnmower coil
Posted by mitchell under Lawn Mower Repair
Small engine coils rarely go bad or fail to function on single cylinder engines,although twin cylinder engines seem to have more of a prob
Published on Wednesday 8th of February 2012 02:25:54 PM
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This past summer,I ran across some interesting thingsconcerning carbs and cams in Briggs an Strattonengines.First of all a customer brought a riding mower in with a12 hp Engine the complaint was that it was running wideopen whenever it was fired up.I immediately checked allof the linkages going to the carb,governor linkages andso forth.They checked out fineand if I had not seen this before, I would have beenstumped.What had happened and apparently was a defect thatBriggs was having on some of these engines.Thescrews that hold the butterfly in the carburetor in placehad vibrated out and were sucked into the engine,passed the valves, into the head and either they willimbede themselves into the soft aluminum head orpiston, or pass out the exhaust side.AT either rate theengine runs wide open because the butterfly cannotcontrol the gas flow .I had one that had sucked thebutterfly into the manifold, intake manifold.I have sawthis happen to several 12 and 14 hp engines, so I know ithas to be a defect of not putting enough loctite on thebutterfly screwsSecondly, a customer brought a 15 hp intek, Briggs anstratton in.The symptoms were,it would fire up and runon idle, but would not idle up.I checked the carb, andimmediately after finding it to be o.k. Proceeded toadjust the valves,being a overhead valve engine. Thatdone, the symptoms were no better.What washappening was the intake valve was letting fuel in, butthe exhaust valve was not staying open long enough tolet exhaust out,so Iput exhaust valve way out oftolerances to see what would happen, nochange.Immediately the possibility of a bad cam cameinto mind,but the engine was no more than two yearsold, then I saw made or assembled in Mexico on theflywheel cap.I pulled the engine, disassembled thebottom crankcase, pulled the cam and wala, one of thelobes was almost completely gone.The exhaust lobe tobe exact. I did this to two 15 hp inteks last season,soapparently there is a defect in some of the cams in thenewer engines,possibly its been solved by now.Also didthis on a 17 hp engine.Note; the replacement cams wereof much better quality.Hope these snippets of info will help you,if you runacross these type of things in the future.
Posted by under Lawn Mower Repair
Published on Wednesday 8th of February 2012 02:25:54 PM
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In order to reduce the resistance during starting time,various types of compression releases have been used.Hower, none proved entirely satisfactorily until briggs @stratton developed the 'easy spin' starting system.THIS IS SO SIMPLE ONE WONDERS WHY IT WAS NEVER THOUGHT OF BEFORE.The intake lobe on the cam gear is ground with a small ramp which holds the intake open one one thousanth of an inch for a tiny fraction of the compression stroke.
Posted by At slow starting speed the interval of time that the valve is open is relatively long and therefore enough air escapes to noticeably reduce the compression.However,at operating speeds the interval of time is so short that there is practically no escape and therefore horsepower is unimpaired.Actually at 3600rpm the valve is opened for a mere 1/200 of a second.In all other respects the valves operate as in any other four stroke cycle engine.The force required to start an engine is reduced by 50% with easy spin and would be noticed most by a person who has difficulty starting the ordinary engine. under Lawn Mower RepairOne thing we must remember.When testing the compression of an 'easy spin' engine one must spin the flywheel backward in the opposite direction to norm
Published on Wednesday 8th of February 2012 02:25:54 PM
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Bowl type carburetors are on 90 percent of todays small engines.They consist of a float, needle and bowl and usually a jet or two.Usually from season to season moisture will build up over time through condensation and that is where the problem occurs, since usually we are running on one cylinder and one spark plug,just one drop of water hitting the spark, will cause it to misfire and run errattic.Some say add stable or some other fuel additive before storing engines for long periods, but there is nothing better than a good clean out of the bowl yearly, since usually only one nut holds bowl on carburetor,sometimes a solonoid will be in place of nut, but it screws out once you disconnect wire going to it.Some of the older model bowl carbs have brass floats, and over time they will develop pin holes, allowing them to fill with fuel and not float anymore, therefore they do not cutt the gas flow off and it will sometimes find its way into your crankcase and mix with oil,which I HAVE SEEN NUMEROUS TIMES.These type floats were adjustable by bending the small metal piece the needle sets on,when the needle had a little wear on it.Todays small engines come with plastic floats, which do not have that particular problem,but the needles still wear, because they have a rubber tip on most of them, or if they are all metal they fit into a rubber seat.If YOU EVER PULL YOUR OIL STICK ON YOUR SMALL ENGINE AND ITS TOO FULL,then most likely you have gas mixed with oil, and a new needle and or seat should be replaced.Also its a good idea to install a cuttoff valve in your fuel line between carb and tank,so you can cutt fuel pressure off to carb when not in use. You can read more on this in carb section in my troubleshooting guide at http://pass.smallenginetrblshtng.com
Posted by under Lawn Mower Repair
Published on Wednesday 8th of February 2012 02:25:54 PM
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So you have just graduated small engine repair school,or just would like to get into the business.Well first of all save some of those advertising dollars,if your the new kid on the block.Word of mouth goes a long way in any business.All you have to do to get in the business assuming your good at repair is to take some of those advertising dollars and scour the area you live in for mowers setting up in peoples yards, you can see them by driving by a lot of times.Stop and ask them what they plan on doing with them.Dont tell them you know how to work on them, nine times out of ten they will get rid of them for a little of nothing.Next after you have aquired several mowers.OH,and try to get the ones that are complete, not the ones torn apart with pieces everywhere.Now you will find, you will have to buy batteries, fix tires, replace solonoids and whatever simple things that stopped them from working in the first place,but now importantly they are yours.Fix them and sell them through your local paperas used mowers.You can double your money this way a lot of times.Also as you sell one, you agree to repair it for the person buying,should anything go wrong.Trust me, they will spread the word,plus you will be making money and getting free advertising this way.Also people will see you workingon these mowers you have aquired and if you live in a high traffic area where a lot of people see you.People will stop by and ask you if you work on small engines without any type of sign advertising it.I know of an individual who graduated from repair school and actually was a pretty good mechanic,bought a small building, put an ad in the paper and waitedHe was closed up in six months working in a factory,simply because the school didnt give any marketing advice as above.Word of mouth is the most powerful advertising there is.If you follow the above advice, you will find eventually that you want have time to scour the area for potential profit selling used mowers you fix,they will be bringing them to you.
Posted by under Lawn Mower Repair
Published on Wednesday 8th of February 2012 02:25:54 PM
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mower carb repair
Posted by mitchell under Lawn Mower Repair
Carburetor solonoids have replaced the fuel bowl nut on a lot of todays engines,from kohler,briggs tecumseh, kawasaki, onan and most of th
Published on Wednesday 8th of February 2012 02:25:54 PM
Read more...
