Crack or casting flaw?

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Calan
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Joined: Sun Jun 21, 2015 8:42 pm

Crack or casting flaw?

Postby Calan » Sun Jan 21, 2018 6:36 pm

Hello to all;
Do the pics show a casting flaw, or a crack, in the bowl of my model E, type 2 carb?
Not great photography or light, I know.
It was more apparent before I took a swipe at it with a shop towel; which makes me think it's more likely a crack than casting flaw.
I can't seem to get it to run right. If the carb is cracked, then that might explain this.
If anyone can tell me how to differentiate a crack from a casting anomaly I'll be grateful. I'll pour some gas in and see if it leaks down, but it hadn't emptied in the week it's been sitting.
All opinions welcome.
Many thanks!
Alan
Edit; if I polish on it, and it goes away, it was a casting issue. Right? It didn't leak when I filled the bowl w/ gas, but it wasn't bolted down or hot, either. All suggestions definitely welcome. Odds are it's a casting issue, I know, but i'm not gonna bolt it back up 'til I get it figured.
Attachments
Carb4.JPG
Carb4.JPG (668.66 KiB) Viewed 534 times
Crack snip2.PNG
Crack snip2.PNG (600.3 KiB) Viewed 534 times
Crack snip.PNG
Crack snip.PNG (456.33 KiB) Viewed 534 times
Last edited by Calan on Sun Jan 21, 2018 8:48 pm, edited 1 time in total.

Dave Bernard
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Re: Crack or casting flaw?

Postby Dave Bernard » Sun Jan 21, 2018 7:00 pm

looks to me like a casting mark.

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wbeaton
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Re: Crack or casting flaw?

Postby wbeaton » Sun Jan 21, 2018 9:10 pm

It’s normal. That is where hot molten metal has contacted already cooling molten metal during the casting process.

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Garry in Tampa
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Re: Crack or casting flaw?

Postby Garry in Tampa » Sun Jan 21, 2018 10:07 pm

I would agree that it is not a crack. If you're concerned, it could polish it out by pulling a strip of 400 grit wet or dry paper across it while holding it against the casting with your finger. It doesn't take much water. I use that system to clean up breaker points using WD40 . . . :)
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bkrsdoz
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Re: Crack or casting flaw?

Postby bkrsdoz » Mon Jan 22, 2018 7:28 am

It is a casting defect.
I look at lots of them at work.
Cracks always start at an edge.

Calan
Posts: 109
Joined: Sun Jun 21, 2015 8:42 pm

Re: Crack or casting flaw?

Postby Calan » Mon Jan 22, 2018 11:03 pm

Many thanks to all.
Yeah, no answer to my high speed bogging issue yet.
And, I see now that a crack in that place wouldn't necessarily even affect performance. Just leak onto the manifold.
Appreciated;
Alan


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