Rear drive fill plug broke


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frodeem
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Rear drive fill plug broke

Post by frodeem »



Hi,

I just got done filling the rear drive with oil and was screwing the fill plug back in and it just snapped off. Attached pictures will give you a better idea. How do I get the broken piece out of the rear drive?












frodeem
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Re: Rear drive fill plug broke

Post by frodeem »

I want to buy a new plug for it. Is number 1 the right item?



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Stew
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Re: Rear drive fill plug broke

Post by Stew »

Can you carefully cut a couple of opposing notches inside it with something like a Dremel cutoff disc and then find something wide and flat enough to unscrew it out of there kinda like a big screw? There's not much material there to make notches without gouging the case though.
Winging it every chance I get 8-)

19,119 miles when I got it from dad Oct 15, 2017 --- 28,659 miles and counting as of Sep 11, 2020!
frodeem
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Re: Rear drive fill plug broke

Post by frodeem »

Stew wrote: Tue Apr 24, 2018 5:40 pm Can you carefully cut a couple of opposing notches inside it with something like a Dremel cutoff disc and then find something wide and flat enough to unscrew it out of there kinda like a big screw? There's not much material there to make notches without gouging the case though.
I am afraid if I try to cut it some metal shavings might get inside the rear drive.
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Stew
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Re: Rear drive fill plug broke

Post by Stew »

No, cut notches at the red areas, be careful to not cut into the threads on the case, and then unscrew it with something that fits in there. That won't let shavings get into the case but will be delicate work for sure.

EDIT: Nevermind, I see what you're saying, the part stuck in is open. Can you use a small chisel and with a hammer tap it around an unscrew it? If the threads aren't holding on tight enough it might work.


Winging it every chance I get 8-)

19,119 miles when I got it from dad Oct 15, 2017 --- 28,659 miles and counting as of Sep 11, 2020!
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Stew
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1986 Honda CR125R
1979 Yamaha GT80

Re: Rear drive fill plug broke

Post by Stew »

Actually the best way would be using the right tool for the job. These type of screw extractors have saved my bacon a few times, just lightly tap it in and unscrew the darn thing.


Winging it every chance I get 8-)

19,119 miles when I got it from dad Oct 15, 2017 --- 28,659 miles and counting as of Sep 11, 2020!
frodeem
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Re: Rear drive fill plug broke

Post by frodeem »

Stew wrote: Tue Apr 24, 2018 6:46 pm Actually the best way would be using the right tool for the job. These type of screw extractors have saved my bacon a few times, just lightly tap it in and unscrew the darn thing.
img_1775.jpg
I will have to check Home Depot for one that would fit. It is quite big so I am not sure about that.
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WingAdmin
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Re: Rear drive fill plug broke

Post by WingAdmin »

I've never seen a screw extractor that big!

Yes, #1 in your diagram is the correct part, and they are readily available, as Honda used them on MANY different bikes. Don't forget the O-ring, part 34 on your diagram.

As for extracting it, I agree, filing would run the risk of getting metal in the final drive, which you do NOT want. Even so, I would probably be tempted to flush and change the gear oil now. It's not going to be in there tight, as the part that would cause it to be tight has broken off. I would just take a pair of needle-nose pliers, open the pliers up so each tip is contacting the broken part of the cover, and rotate counterclockwise to screw it out. Once it's a few threads out, you should probably be able to do it the rest of the way with your fingers.
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DenverWinger
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Re: Rear drive fill plug broke

Post by DenverWinger »

Do they make "Easy-Out"s that big?
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
frodeem
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Re: Rear drive fill plug broke

Post by frodeem »

WingAdmin wrote: Tue Apr 24, 2018 8:58 pm I've never seen a screw extractor that big!

Yes, #1 in your diagram is the correct part, and they are readily available, as Honda used them on MANY different bikes. Don't forget the O-ring, part 34 on your diagram.

As for extracting it, I agree, filing would run the risk of getting metal in the final drive, which you do NOT want. Even so, I would probably be tempted to flush and change the gear oil now. It's not going to be in there tight, as the part that would cause it to be tight has broken off. I would just take a pair of needle-nose pliers, open the pliers up so each tip is contacting the broken part of the cover, and rotate counterclockwise to screw it out. Once it's a few threads out, you should probably be able to do it the rest of the way with your fingers.
Yeah this way seems to be the way to go, I will let y'all know how it goes.
frodeem
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Re: Rear drive fill plug broke

Post by frodeem »

DenverWinger wrote: Wed Apr 25, 2018 7:37 am Do they make "Easy-Out"s that big?
i doubt it
frodeem
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Re: Rear drive fill plug broke

Post by frodeem »

Got it out. I used a 90 degree dental pick to get it out. It was quite easy actually. Thanks everyone.





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WingAdmin
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Re: Rear drive fill plug broke

Post by WingAdmin »

That's a classic overstress fracture. Someone cranked that thing in there TIGHT at some point.
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Stew
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Re: Rear drive fill plug broke

Post by Stew »

Good deal. Yeah I didn't think about those extractors only going so big...
Winging it every chance I get 8-)

19,119 miles when I got it from dad Oct 15, 2017 --- 28,659 miles and counting as of Sep 11, 2020!
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dingdong
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Re: Rear drive fill plug broke

Post by dingdong »

When you install the new plug remember there should be an oring seal on there. Be sure to order one. So it doesn't need to be torqued at all, just tight enough to seal.


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