B&S 31C707 0230 E1 030517ZE flywheel

[jwales]

I actually started this on the old site (craftsman 42" lawn tractor w/ B&S OHV) with and engine running good but issue of blue smoke from the exhaust and difficulty starting. Based on responses from many and a PM from Walt I pulled the head, bad head gasket, replaced. Adjusted the valves(several times) and turns over well. Tried starting it and would only pop and not run. tried several times, cleaned carb andusted plug gap, etc. Turns out the flywheel key was sheared. Problem solved??hopefully.

Issue; the shaft that the flywheel sits on (tapered and smooth) except for about 1/8 inch, from the top down the shaft and the inside of the flywheel about 1/8 inch span about 1/4 inch from the top of the flywheel. I am assuming this was casued by the keyway shearing (and me trying to keep starting it)

Will it be fine to just put in a new key or have I destroyed a perfectly good engine with the damage to the shaft and/or flywheel??? I am guessing there is a spec for torque on the flywheel bolt. That would be appreciated if anyone knows.

Thanks much.

[Deere2me]

Nut torque is 100 Ft. Lb.
IF you know what your doin' , you can lap the flywhl to the crank using valve grinding compound. It's worked for me several times. Depends on how bad its munged up.

[KE4AVB]

If you can get a good clear picture and post it of this we might have a better idea of the your talking about.

[jwales]

Sorry I should have been a little more clear. The top 1/8 of the shaft is not smooth. I believe due to the flywheel spinning on the shaft when the keyway sheared. It is not rough enough to cut my finger but not machine smooth. Same goes for the inside of the flywheel, 1/8 inch swath of rough surface about 1/4 down from the top of the flywheel. I will try with some i-phone photo's to see if that will clarify things better.
Thanks

[jwales]

Ok, I am trying this photo bucket program to get pictures on here. Hope I have figured out how.
http://s1274.photobucket.com/user/jwales3/library/
These pictures are of the inside of the flywheel and the top of the crank shaft. As I siad before the areas are rough but not sharp (able to cut finger). Do I need to woryy about this?? Should I use a little emory cloth on it first??? Or is this shot??

Thanks.

[bgsengine]

I'd just make sure the keyway is filed down, maybe a very slight inward bevel is OK - looks like (from the last photo) that there's some damage to the keyway from someone having put a steel key in there.. can just barely see an imprint in the side of the keyway that looks like it was done by a steel key.
Correct key is aluminum 222698S - using a steel key will ruin crank and flywheel , but if that keyway edge is smooth and doesnt catch a finger sliding along the length (You'd be able to feel a ridge) then throw it back together - flywheel and rest of cranklooks fine - they dont need to be "shiny polished" - just clean and relatively smooth -some light pitting, scoring and aluminum smudges are OK , just make sure you torque it down correctly, with a proper OE flywheel key and probably be fine. you can always polish it with a little emery cloth if it makes you nervous but again make sure it is perfectly clean before re-assembly

[KE4AVB]

Nut torque is 100 Ft. Lb.

Correct key is aluminum 222698S

This specification has been changed.

New Briggs torque settings for this engine series. Increase torque to 110 ft lbs use steel key PN 796335

This affects the 210000, 280000, 310000 OHV engines

[jwales]

Thanks for the info. I got the keyway (steel). One other dumb question. My torq wrench is marked in inch/lbs. So should I be dividing 110 by 12 for my inch/lbs. conversion???

[StarTech]

Thanks for the info. I got the keyway (steel). One other dumb question. My torq wrench is marked in inch/lbs. So should I be dividing 110 by 12 for my inch/lbs. conversion???

It actually the other way around in-lbs to ft-lbs divide by 12. Ft-lbs to in-lbs multiple by 12. My in-lbs torque wrench only goes to 200 in-lbs which is only 16.667 ft-lbs.

If your torque can actually go this high here is numbers. 110 ft-lbs is 1320 in-lbs

[Deere2me]

Thanks for the info. I got the keyway (steel). One other dumb question. My torq wrench is marked in inch/lbs. So should I be dividing 110 by 12 for my inch/lbs. conversion???

You might wanna check that torque wrench again, there j. I ain't never seen an inch lb. torque wrench go that high!
Just throw the ol' air impact on it and be done!