Vinnyd0810
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Briggs and stratton flywheel problem
I have a briggs and stratton riding lawn mower engine. Model # 31907-0018. The engine recently stopped spinning(flywheel) and the end result was broken magnets inside the flywheel, destroyed the alternator and the metal fragments were everywhere. Since the flywheel is an expensive part, i want to know if it is possible or even recommended to replace just the magnets?
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AVB
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Re: Briggs and stratton flywheel problem
2019/05/19 20:22:02
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There is only two options, either a new flywheel or an used one from a donor engine.
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Vinnyd0810
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Re: Briggs and stratton flywheel problem
2019/05/20 21:00:35
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Thank you. New part is on the way.
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Vinnyd0810
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Re: Briggs and stratton flywheel problem
2019/05/23 21:35:53
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Update on this problem: new flywheel installed, new key as well, new stator. Mower wont start. What could i have missed or misadjusted in doing this install?
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Roy
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Re: Briggs and stratton flywheel problem
2019/05/23 22:18:24
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The sudden stoppage could have done some internal damage, remove the valve cover and see if you have a bent pushrod. Is the piston moving? Check valve timing by bringing the piston to top dead centre (viewed through the spark plg hole), the intake valve should be opening as the exhaust closes. You may have a stripped cam gear.
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AVB
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Re: Briggs and stratton flywheel problem
2019/05/24 08:22:44
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Also wouldn't hurt to check for spark.
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Wilber
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Re: Briggs and stratton flywheel problem
2019/05/24 09:44:38
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It is always good to figure out the problem, but at some point you must choose the best bang for buck.
Either keep spending energy [=time x dollars], or replacing the engine parts one by one ad finite, or buying a (new/used) duplicate machine and using one or the other to keep one or the other running.
Sometimes a problem involves two or more unrelated issues, and 95% of troubleshooting keeps going back and forth 'twixt the two, making a solution seemingly like a mirage.
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Roy
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Re: Briggs and stratton flywheel problem
2019/05/24 11:35:55
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Ensure you have the correct flywheel. There was a running change on those engines in 2012, the key position was changed on the crankshaft. I agree with AVB, maybe it's time to cut your losses.
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AVB
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Re: Briggs and stratton flywheel problem
2019/05/24 16:28:58
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Roy
Ensure you have the correct flywheel. There was a running change on those engines in 2012, the key position was changed on the crankshaft. I agree with AVB, maybe it's time to cut your losses.
I didn't know they changed the keyway position timing wise. The only service bulletin I have seen is one from 2013 where they resigned the keyway to be parallel to the taper and not the crankshaft center line.
post edited by AVB - 2019/05/25 08:25:15
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Vinnyd0810
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Re: Briggs and stratton flywheel problem
2019/05/25 07:19:49
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Im not ready just yet to replace mower. I would rather someone with vast experience at least diagnose it and tell me what will be its future. Please explain the flywheel key update you referenced. I simply installed the key in the only way that it seemed to fit
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AVB
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Re: Briggs and stratton flywheel problem
2019/05/25 08:26:04
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Roy
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Re: Briggs and stratton flywheel problem
2019/05/25 09:35:41
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AVB
Roy
Ensure you have the correct flywheel. There was a running change on those engines in 2012, the key position was changed on the crankshaft. I agree with AVB, maybe it's time to cut your losses.
I didn't know they changed the keyway position timing wise. The only service bulletin I have seen is one from 2013 where they resigned the keyway to be parallel to the taper and not the crankshaft center line.
We had customers run into problems, they didn't watch the date code when ordering short blocks for warranty repairs. The flywheel fit but the engine didn't run.
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AVB
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Re: Briggs and stratton flywheel problem
2019/05/25 11:21:40
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Yes that can be a problem but if the partial model number search is correct and it is a 31R907-0018 they only use one flywheel and the long steel key [591757].
I would check for side play of the crankshaft on both end and replace the the bushing(s) as needed.
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Vinnyd0810
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Re: Briggs and stratton flywheel problem
2019/05/25 17:47:49
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This info on the update is interesting and helpful. Thank you very much. As i read and think , i can state with 100% certainty that if the correct flywheel is a long one( as per the part # above), i have put the wrong key in the flywheel. I ignorantly got the first ones i saw, assuming it was basically universal. The one i put in is about half the size of the correct one. Before giving up on this mower, that was perfect before I might’ve nudged a stump and stalled out, im willing to at least try the proper key
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