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How to check a briggs ignition?


i have started to work on a briggs 146702 5hp it has compression and rolls over fine but no fire...

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  #1  
Old 05-01-2011, 09:30 PM
cjrolke cjrolke is offline
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Default How to check a briggs ignition?

i have started to work on a briggs 146702 5hp

it has compression and rolls over fine but no fire

got the shroud off and the flywheel magnet is good

how do i check the coil? are their points on a motor like this

(sorry used to working on kohlers on cubs and the like with points)

any help would appreciated

thanks
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  #2  
Old 05-02-2011, 07:50 AM
K D Redd K D Redd is offline
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Default Re: How to check a briggs ignition?

The ignition points are UNDER the flywheel. Your armature/coil should have three legs that come near the magnets on the flywheel. You CAN NOT use a Briggs Magnetron armature/ignition coil on this engine. If the flywheel key is sheared, the magneto will NOT spark because the magnets and points become out of time. Remove the flywheel and the cover over the points. Cleaning the points will likely solve your no ignition problem. If cleaning the points does not solve your problem, tell use and we can help you further.

Kent
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Old 05-02-2011, 07:59 AM
Arlie Levy Arlie Levy is offline
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Default Re: How to check a briggs ignition?

Make sure to really clean the points good. Make them shine like new then run a clean piece of paper or clean rag between. this will clean all of the oily film of them. Usually coils are not a problem. Sometimes condensers can go bad but I have never had to re place one. The only coil problems I have run into are on the ZZ moders.
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Old 05-02-2011, 10:06 AM
cjrolke cjrolke is offline
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Default Re: How to check a briggs ignition?

ok will try that tonight

thanks
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  #5  
Old 05-02-2011, 11:01 AM
K D Redd K D Redd is offline
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Default Re: How to check a briggs ignition?

We forgot to tell you the point gap. The setting it .020 inch.

Kent
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Old 05-02-2011, 12:54 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: How to check a briggs ignition?

The 5 HP B&S is known for getting moisture and oil vapor into the points chamber! It gets there thru the points plunger, and is a byproduct of engine combustion and crankcase pressure, generated as the engine runs. On some engines, it is a yearly ritual to clean and reset the points! The problem may be reduced by replacing the points plunger, but usually it does not help. It's just the nature of the beast. The largest problem with the 5 HP is oil consumption. Because of the large swept area of the rings, cylinder bore area, the high speeds the B&S operates at, as well as the aluminum construction, these engines tend to burn oil as they run. It is not enough to emit visible smoke, unless the engine is well worn, but it is burnt none the less. The best advice is to check the oil level EVERY time fuel is added to the tank. In this way, you avoid grenading or seizing the engine Let us know how you do with the engine.
Andrew
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Old 05-02-2011, 12:56 PM
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Doug Oldenburg Doug Oldenburg is offline
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Default Re: How to check a briggs ignition?

One thing not yet mentioned,but there is a fiber"pushrod" in there that operates the points.It goes through a hole in the main bearing boss & sometimes will swell or become stuck & hold the points in the open position. The best solution is a new fiber pushrod, the next best thing is to take a real fine piece of emery cloth & clean it up just a LITTLE to where it moves freely in the hole. Be VERY carefull not to take off to much off, as if pushrod is to loose in the hole, it will leak oil out & short the points out.{I am sure "pushrod"is not the proper name for this fiber part,but I don't know the name of it.}
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Old 05-02-2011, 02:41 PM
cjrolke cjrolke is offline
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Default Re: How to check a briggs ignition?

thanks i will look in to it

this is what the motor is on


i really think it is a cool little machine

i have the top shroud off and am wondering how the fly wheel is removed i do not see a nut that holds it on ( i assum there it on just not seeing anything

thanks again
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Old 05-02-2011, 03:07 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: How to check a briggs ignition?

The proper terminology for the 'points pushrod' is plunger, as I noted in my post, above. Turn the engine over slowly, with the points cover off. As the engine nears TDC, you should see the points close and then open as the engine nears Top Center. As the plunger rides on a cam built into the crankshaft, the points will close and open every revolution of the crank. If the plunger indeed is not allowing the points to close, try cleaning off the plunger with some carb cleaner, and try slipping it up and down the bore of the hole that is its mount. Best bet, if the plunger binds, is replacement. When you re-install, do not oil it. The plunger gets its lube from oil spinning off the crankshaft.
Andrew
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Old 05-02-2011, 07:10 PM
cjrolke cjrolke is offline
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Default Re: How to check a briggs ignition?

ok

here is what i learned tonight

the points plunger is moving
the points are cleaned
(it took a while to get the recoil and the flywheel off )

how ever i think i found my issue but not for sure

if you put a multimeter to the screw that the condensor hooks to and to ground it reads .5 ohms

i unhooked the condensor and tested it for resistance from the wire to ground and it it not shorted.

so to recap any where i put the multimeter on the ignition it reads as a short to ground and no spark

next idea of where to go??

thanks for the help
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  #11  
Old 05-02-2011, 08:18 PM
cjrolke cjrolke is offline
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Default Re: How to check a briggs ignition?

just checked th resistance across the coil and its .5 ohm

should more than that right?/?/
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  #12  
Old 05-03-2011, 09:25 AM
K D Redd K D Redd is offline
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Default Re: How to check a briggs ignition?

The primary resistance of a magneto coil is around ONE ohm or LESS so .5 Ohm is about right. Did you measure the resistance of the spark plug wire to ground? It should be in the 5 to 8 KOHM range. If you read infinity, the high tension side of the coil is open.

Kent
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Old 05-03-2011, 09:30 AM
cjrolke cjrolke is offline
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Default Re: How to check a briggs ignition?

i believe i did check that

and it was open

so the problem is the coil still

thanks
i will verify that measurement tonight
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  #14  
Old 05-03-2011, 08:03 PM
cjrolke cjrolke is offline
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Default Re: How to check a briggs ignition?

Quote:
Originally Posted by K D Redd View Post
The primary resistance of a magneto coil is around ONE ohm or LESS so .5 Ohm is about right. Did you measure the resistance of the spark plug wire to ground? It should be in the 5 to 8 KOHM range. If you read infinity, the high tension side of the coil is open.

Kent
just measured the plug wire to ground and it reads infinity

so the coil is bad right>???

thanks
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  #15  
Old 05-04-2011, 09:31 AM
K D Redd K D Redd is offline
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Default Re: How to check a briggs ignition?

Yes, Is this a Three legged Armature/Coil? If so they are no longer available from Briggs. I have found that the center leg of the three can be cut down to 3/8 inch square to install a Tecumseh coil that is still available new from aftermarket small engine parts suppliers. I am also told by Bob's Small Engine Repair that there are many used coils available. He also said that I think WICO had a winding to replace the winding part of the Armature/Coil.

Kent
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  #16  
Old 05-04-2011, 10:04 AM
cjrolke cjrolke is offline
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Default Re: How to check a briggs ignition?

i dont believe it is a 3 legged coil

briggs number 298968

it looks like this
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Old 05-17-2011, 04:21 PM
cjrolke cjrolke is offline
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Default Re: How to check a briggs ignition?

well i replaced the coil and now have gotten it to run on starting fluid

thansk for the help

now to get the tank cleaned out and try to get it back together
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