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Old 02-18-2012, 07:33 PM   post #1 of 15
GB in MN
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Default Briggs Model 326437 Points plunger

Hi All, I am working on the Briggs 16 hp cast iron single 326437 it was running fine was adjusting the carb when suddenly it started running intermittently like the ignition switch was being turned on / off checked the spark and it was cutting in and out removed the points cover and checked the points and found the they were barely opening tried to adjust them now have no spark and have very little plunger movement what could have happened?? Is it possible to remove the plunger without braking it and not having to open the engine?
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Old 02-18-2012, 08:18 PM   post #2 of 15
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Default Re: Briggs Model 326437 Points plunger

According to my service manual. The engine has to be disassembled to remove the plunger. There is a tappet on the inside end on the plunger that rides on a lobe on the camshaft. Here is a pic I scanned out of my manual. If you need additional diagrams, let me know. I have two giant B&S service manuals. Hope this helped, - Brad
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Old 02-18-2012, 08:26 PM   post #3 of 15
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Default Re: Briggs Model 326437 Points plunger

Hi 73Searstractor, I was afraid that was the case, any idea why it would stop working, it move in and out but only a very small amount. The engine was running very nice and just like that it stopped working.
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Old 02-18-2012, 08:30 PM   post #4 of 15
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Default Re: Briggs Model 326437 Points plunger

If this has a battery/coil ignition system (which I doubt), you will have to get the points operating correctly. If it has a Briggs magneto, have the flywheel repolarized and convert the engine to Magnetron ignition. No more points and end of your problems.
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Old 02-18-2012, 08:45 PM   post #5 of 15
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Default Re: Briggs Model 326437 Points plunger

Repolarize the flywheel??
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Old 02-18-2012, 08:51 PM   post #6 of 15
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Default Re: Briggs Model 326437 Points plunger

Quote:
Originally Posted by GB in MN View Post
Hi 73Searstractor, I was afraid that was the case, any idea why it would stop working, it move in and out but only a very small amount. The engine was running very nice and just like that it stopped working.
It is possible that the plunger broke off partially inside. I would try removing the plunger, There isn't much more harm that can be done if its broken inside.
Try pulling it out of the sleeve. If you don't want to tear into the motor, You can convert it to magnatron ignition. B&S made those 30ci and 32ci cast iron engines from 1957 to 1988 (Believe). So you can get an electronic coil. I like points better because when they're adjusted right they have a much stronger spark. How little does the plunger move? All the plunger needs to do is open the point contacts 10 thousandths of an inch. If the points are opening then you need to replace the points and condenser. Sometimes the point surface will burn out and the engine won't run. - Brad
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Old 02-18-2012, 09:11 PM   post #7 of 15
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Default Re: Briggs Model 326437 Points plunger

Hi guys, its a points engine I converted it to battery ignition as the magneto as intermittent, was running great. Per my parts manual this engine per type # and date # can not be converted to magnatron ignition, likewise I like points also believe it produces a better spark. Pulling the engine out of this tractor is a bear the engine oil pan is the front axle bolster and you have to half dissemble the tractor to remove the driveshaft.
Brad do you think if I pulled the plunger out that I could fabricate a longer replacement?
Or you maybe right about them only needing to open a bit maybe I should try a new set of points and a condenser before being too rough on the plunger. I was also wondering if removing the front pulley and the bearing cover if you could get at the plunger?
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Old 02-18-2012, 09:23 PM   post #8 of 15
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Default Re: Briggs Model 326437 Points plunger

Quote:
Originally Posted by GB in MN View Post
Hi guys, its a points engine I converted it to battery ignition as the magneto as intermittent, was running great. Per my parts manual this engine per type # and date # can not be converted to magnatron ignition, likewise I like points also believe it produces a better spark. Pulling the engine out of this tractor is a bear the engine oil pan is the front axle bolster and you have to half dissemble the tractor to remove the driveshaft.
Brad do you think if I pulled the plunger out that I could fabricate a longer replacement?
Or you maybe right about them only needing to open a bit maybe I should try a new set of points and a condenser before being too rough on the plunger. I was also wondering if removing the front pulley and the bearing cover if you could get at the plunger?
I would deffinately try the points first! I think a new set is only like $7. And yes, The crank case cover is under the flywheel and must be removed to pull the cam out and access the plunger. - Brad
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Old 02-19-2012, 12:15 PM   post #9 of 15
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Default Re: Briggs Model 326437 Points plunger

Quote:
Originally Posted by duffer72 View Post
Repolarize the flywheel??
Earlier engine can be converted to Magnetron, but the magnets on the flywheel have to be reversed. If it has the magneto under the blower housing, it can be converted. Last I knew, Briggs will do the repolarization for free if you send them the flywheel.
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Old 02-19-2012, 01:12 PM   post #10 of 15
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Default Re: Briggs Model 326437 Points plunger

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Originally Posted by rscurtis View Post
Earlier engine can be converted to Magnetron, but the magnets on the flywheel have to be reversed. If it has the magneto under the blower housing, it can be converted. Last I knew, Briggs will do the repolarization for free if you send them the flywheel.
I have converted many breaker point B&S engines to magnatron for guys. I have never needed to repolarize the flywheel. Which engines are you talking about?
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Old 02-19-2012, 02:06 PM   post #11 of 15
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Default Re: Briggs Model 326437 Points plunger

The cast iron block engine's flywheels must be re-polarized to use the magnetron ignition , I put a magnetron on my ss15 for a while and never could get it to run correctly. I though it was the carb. When I went and restored it I put a new set of points and condenser in it and it runs great. I have put magnetrons on aluminum block engines with great results.
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Old 02-19-2012, 02:15 PM   post #12 of 15
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Default Re: Briggs Model 326437 Points plunger

I just drill them out and push in a new one...
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Old 02-19-2012, 03:00 PM   post #13 of 15
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Default Re: Briggs Model 326437 Points plunger

Quote:
Originally Posted by SS_Skippy View Post
The cast iron block engine's flywheels must be re-polarized to use the magnetron ignition , I put a magnetron on my ss15 for a while and never could get it to run correctly. I though it was the carb. When I went and restored it I put a new set of points and condenser in it and it runs great. I have put magnetrons on aluminum block engines with great results.
Ah ok, I've never tried to convert a cast iron engine. There's really no point because the points are so easy to access. I have converted tons of aluminum engines as well with no problems. - Brad
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Old 02-19-2012, 06:08 PM   post #14 of 15
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Default Re: Briggs Model 326437 Points plunger

You are correct, the points are easy to access. But once you switch to the Magnetron, you have a maintenance-free ignition system that is impervious to moisture.
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Old 02-20-2012, 01:04 PM   post #15 of 15
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Default Re: Briggs Model 326437 Points plunger

Good Morning all, good news the Briggs is running again, I want to thank all you for the help and suggestions, turns out it was not the plunger or the points nor the condenser, not the spark plug wire but the darn coil I suspected it right away on Saturday and tried another coil with no results so I got off and all the other things. Anyway this morning after being well rested I checked things again and sure enough the coil was bad as was the 2nd one I had tried the 3 rd one was the charm had good spark and the engine started up and runs nice. Both bad coils are now in the trash can and its a matter of tiding things up. Thanks again guys.
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