Concern over Crack
+2
Big Dave
sunnydog
6 posters
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Concern over Crack
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.
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.
sunnydog- Posts : 2053
Join date : 2012-10-28
Age : 55
Location : Akimbo Alogo
Re: Concern over Crack
Anything can be welded , but what caused the crack would be the issue
Dave
Dave
Big Dave- Posts : 615
Join date : 2012-11-06
Age : 67
Location : Osoyoos B C
Re: Concern over Crack
Think it started w the oiling issue leading to overheating and a piston slap issue.
sunnydog- Posts : 2053
Join date : 2012-10-28
Age : 55
Location : Akimbo Alogo
Re: Concern over Crack
I would turf it, unless hes gonna rebore
then itsa likely cheeper to replace anyhow
then itsa likely cheeper to replace anyhow
Shakerattlenroll- Posts : 112
Join date : 2012-11-07
Age : 56
Location : gp
Re: Concern over Crack
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.
sunnydog- Posts : 2053
Join date : 2012-10-28
Age : 55
Location : Akimbo Alogo
Re: Concern over Crack
Well it could be welded , but it is cast and cast has a strong tendancy to crack when welded
sooo , I dunno , great welder or not, is it worth the cost and risk
sooo , I dunno , great welder or not, is it worth the cost and risk
Shakerattlenroll- Posts : 112
Join date : 2012-11-07
Age : 56
Location : gp
Re: Concern over Crack
Is the metal in the cylinder wall/skirt cast as well??
sunnydog- Posts : 2053
Join date : 2012-10-28
Age : 55
Location : Akimbo Alogo
Re: Concern over Crack
I would assume
Shakerattlenroll- Posts : 112
Join date : 2012-11-07
Age : 56
Location : gp
Re: Concern over Crack
I thought the sleeve for the pistons is an steel insert?
sunnydog- Posts : 2053
Join date : 2012-10-28
Age : 55
Location : Akimbo Alogo
Re: Concern over Crack
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
Shakerattlenroll- Posts : 112
Join date : 2012-11-07
Age : 56
Location : gp
Re: Concern over Crack
I'm gonna be quiet :)
Denistheshovelmenace- Posts : 57
Join date : 2012-10-27
Location : It changes depending on the mood
I donna think so
The cylinders are all cast, no sleeves in them unless you resleeves em.
coopsta- Posts : 423
Join date : 2012-10-29
Age : 55
Location : Brooks Alberta
Re: Concern over Crack
Thanks Coop, sounds like Lee got a barrel from Larry today.
sunnydog- Posts : 2053
Join date : 2012-10-28
Age : 55
Location : Akimbo Alogo
Say what?
Did you say Lee got put over a barrel by Larry today.....damn that Larry is cagey!!
coopsta- Posts : 423
Join date : 2012-10-29
Age : 55
Location : Brooks Alberta
Re: Concern over Crack
LOL yeah...the old guy showin the young guy how its done, givin him a hand ya know!!
sunnydog- Posts : 2053
Join date : 2012-10-28
Age : 55
Location : Akimbo Alogo
Re: Concern over Crack
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,,,,
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,,,,
Re: Concern over Crack
Thanks Koot, that's one hell of a beauty bike.
sunnydog- Posts : 2053
Join date : 2012-10-28
Age : 55
Location : Akimbo Alogo
Re: Concern over Crack
That's Mike Jensen the machinist?
sunnydog- Posts : 2053
Join date : 2012-10-28
Age : 55
Location : Akimbo Alogo
Re: Concern over Crack
ya you bet sunny! hes one talented guru for all things mechanical,,,,sunnydog wrote:That's Mike Jensen the machinist?
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