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Concern over Crack

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Concern over Crack Empty Concern over Crack

Post  sunnydog on Sun May 05, 2013 2:33 pm

Helped young Lee the bike builder pull his top end yesterday, front cylinder appears to have starved for oil, piston scored up on back thrust face front cylinder, also roughed up the jug. Cylinder has a hairline crack at base running up about 3/4 of an inch from skirt up to casting....question: can this be welded?

Otherwise, rear cylinder okay, appears to be stock bore 80", 3.494 inches mic'd. This is an early 80's FLT motor in a chopper frame. I will try to get him to send pics.
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Post  Big Dave on Sun May 05, 2013 2:34 pm

Anything can be welded , but what caused the crack would be the issue

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Post  sunnydog on Sun May 05, 2013 3:10 pm

Think it started w the oiling issue leading to overheating and a piston slap issue.
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Post  Shakerattlenroll on Sun May 05, 2013 4:09 pm

I would turf it, unless hes gonna rebore
then itsa likely cheeper to replace anyhow
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Post  sunnydog on Sun May 05, 2013 4:24 pm

Yes he would have to rebore. It's likely that you're right Wade, cheaper to replace, but he is one hell of a welder, does it for a livin.
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Post  Shakerattlenroll on Sun May 05, 2013 5:04 pm

Well it could be welded , but it is cast and cast has a strong tendancy to crack when welded Shocked

sooo , I dunno , great welder or not, is it worth the cost and risk Wink
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Post  sunnydog on Sun May 05, 2013 5:16 pm

Is the metal in the cylinder wall/skirt cast as well??
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Post  Shakerattlenroll on Sun May 05, 2013 5:24 pm

I would assume scratch
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Post  sunnydog on Sun May 05, 2013 6:10 pm

I thought the sleeve for the pistons is an steel insert?
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Post  Shakerattlenroll on Sun May 05, 2013 8:14 pm

sunnydog wrote:I thought the sleeve for the pistons is an steel insert?

I know they can sleeve them, but I don't think they come like that .
smallblock chevys don't Wink
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Post  Denistheshovelmenace on Sun May 05, 2013 9:26 pm

I'm gonna be quiet :)
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Post  coopsta on Sun May 05, 2013 10:58 pm

The cylinders are all cast, no sleeves in them unless you resleeves em.
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Post  sunnydog on Sun May 05, 2013 11:03 pm

Thanks Coop, sounds like Lee got a barrel from Larry today.
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Post  coopsta on Sun May 05, 2013 11:17 pm

Did you say Lee got put over a barrel by Larry today.....damn that Larry is cagey!!
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Post  sunnydog on Mon May 06, 2013 7:45 am

LOL yeah...the old guy showin the young guy how its done, givin him a hand ya know!!
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Post  kootenai on Mon May 06, 2013 7:05 pm

preheat, the part,,weld and cool super slow for cast is what I learned,never welded an engine cylinder though,,
indian mike in crannie,rewelded his jug on his 47 chief when it had a huge hole in the side of it,,,,and he still runs it to this day,,,,
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Post  sunnydog on Mon May 06, 2013 7:27 pm

Thanks Koot, that's one hell of a beauty bike.
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Post  kootenai on Tue May 07, 2013 2:58 am

I do believe mike resleeved after welding though.....
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Post  sunnydog on Tue May 07, 2013 7:20 am

That's Mike Jensen the machinist?
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Post  kootenai on Tue May 07, 2013 5:46 pm

sunnydog wrote:That's Mike Jensen the machinist?
ya you bet sunny! hes one talented guru for all things mechanical,,,,
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