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Crack in Frame

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Schwee
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Location: SW Florida

Crack in Frame

#1

Post by Schwee » Tue Dec 10, 2013 11:23 pm

I noticed a crack in the bottom of my rigid frame. This is a daily driver, but I'm fixin to tear down in a few months to repaint and re-chrome. Is this crack serious? Do I need to stop riding? Do I need a special frame guy to fix it? I'm in a rather remote area of SW Florida.
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1950Panhead
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Re: Crack in Frame

#2

Post by 1950Panhead » Wed Dec 11, 2013 12:02 am

It looks like your motor mount casting has cracked, I would weld it back together.
Jerry

1951 adam
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Re: Crack in Frame

#3

Post by 1951 adam » Wed Dec 11, 2013 12:36 am

There's a good frame guy in Fl , PM me and ill forward the info if you want
Adam

Bigincher
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1952 FL
1977 FLH
1994 Fatboy

Re: Crack in Frame

#4

Post by Bigincher » Wed Dec 11, 2013 12:40 am

That's a pretty serious and fairly common problem.
If you're using the stock seat post assembly, it only makes it worse.
If it was mine, I'd get it fixed right away. It's not a hard fix right now, other than tearing the motorcycle down to the frame.
But rejoice! They come apart real easy...! :wink:

old.wrench
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Location: in the garage

Re: Crack in Frame

#5

Post by old.wrench » Wed Dec 11, 2013 12:42 am

Schwee,
That is a fairly simple repair (cracked weld at bottom of seat post), you need to get it welded up. I repaired one that was cracked in the same spot a couple years ago and I know of another frame that had the same problem, so although I wouldn't go so far as to say it's a common problem, it's not an unusual one. Although you could reach in there right now and get some sort of a weld on it, I would go ahead and clean it up good and get a nice prep on it and check the frame alignment before I'd weld it up. That way you'd know that you're going to be in good shape down the road.

Geo.

Bigincher
Posts: 2830
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1952 FL
1977 FLH
1994 Fatboy

Re: Crack in Frame

#6

Post by Bigincher » Wed Dec 11, 2013 12:43 am

I've seen a lot of those where people have "reached in there and got some kind of weld on it."
I'd advise against that.

PanPal
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58 FL
76 FLH All Original
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Re: Crack in Frame

#7

Post by PanPal » Wed Dec 11, 2013 12:54 am

I dont see where it would hurt to tack it now and do it correctly when you tear it down in a couple months. The tacks will likely crack in short order. Is that a brake cross over mounted to the top portion? If so does it move when you apply brakes?

old.wrench
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Location: in the garage

Re: Crack in Frame

#8

Post by old.wrench » Wed Dec 11, 2013 3:46 am

Schwee,
Take a close look at the top of the seat post too. When you have a crack at the bottom like that, it could mean your seat post tube was doing a little flexing and you might also have a crack at the top similar this -
IMG_0056.jpg
I hope you don't have any other cracks, but you'll want to take a real good look at the other welds, when you've got a bad crack in one spot like yours, it's not unusual to find another one upon close inspection. The only way to find out is to take a good look. Maybe sandblast the frame before you re-paint it?

Geo.
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Huck
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91 hd
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Re: Crack in Frame

#9

Post by Huck » Wed Dec 11, 2013 4:40 pm

Personally I couldn’t enjoy the ride knowing this issue exists. I’d be worried about buggering my engine case. I would not ride it.

Bosheff
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Location: Michigan

Re: Crack in Frame

#10

Post by Bosheff » Wed Dec 11, 2013 6:37 pm

Not an uncommon occurance. Motorcycle will definitely vibrate. Possibly lead to top motormount fracture....bosheff

Cotten
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Location: Central Illinois

Re: Crack in Frame

#11

Post by Cotten » Wed Dec 11, 2013 9:08 pm

If it was me, Schwee,...

The frame would be blasted clean, and then warmed to observe for oily contaminants to weep from cracks.

Magnafluxing can be done with an armature growler, if you are that bored.
If really suspicious, you can dye-check with stencil ink and Arrid Dry.

Frame work is fun.

....Cotten

Schwee
Posts: 137
Joined: Wed Jul 29, 2009 2:54 pm
Bikes: 57 Pan, 42 WLA
Location: SW Florida

Re: Crack in Frame

#12

Post by Schwee » Wed Dec 11, 2013 10:38 pm

Curses.
Guess it's time to repaint and re-chrome, too.
Anybody know a chrome shop in SW Florida? I'm between Tampa and Ft Myers.

Bigincher
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Re: Crack in Frame

#13

Post by Bigincher » Wed Dec 11, 2013 11:09 pm

Schwee, an easy way to check for cracks, if not readily apparent, is to apply paint thinner or lacquer thinner. You will see it seep into the crack and dry out. You'll want to examine every connection point of your frame, including the underside. Media blast it first, paint can hide a lot of hairline cracks, which you'll want to repair now also, of course.
I find that frame work IS fun, when working under the tutelage of a well-experienced expert in a properly set-up designated frame shop.

Cotten
Posts: 6911
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Location: Central Illinois

Re: Crack in Frame

#14

Post by Cotten » Wed Dec 11, 2013 11:22 pm

Schwee!

I don't know about the chrome, but the framework shouldn't scare you.

T'aint "rocket surgery".

.....Cotten

Schwee
Posts: 137
Joined: Wed Jul 29, 2009 2:54 pm
Bikes: 57 Pan, 42 WLA
Location: SW Florida

Re: Crack in Frame

#15

Post by Schwee » Thu Dec 12, 2013 1:46 pm

Just bad timing.
Last night, riding home from the pool hall, the temp dipping down below 70, the Beast was just growling through his two-inch drag pipes. Hate to put him under the knife!

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