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TOPIC: Fixing small cracks on aluminum engine parts

Fixing small cracks on aluminum engine parts 21 Feb 2009 21:47 #266979

  • Darkangel
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I pulled off my cover to my stator, and BEHOLD! THERE WAS A FRIGGIN CRAKE AT THE VERY BOTTOM! I had just started to degrease the engine because of caked oil and dirt everywhere, and I feared that maybe there was a something more serious going wrong with the engine. Good news, there isn't. Bad news, there's a crack on the stator cover....How can I fix it with out getting a used stator cover? mig or tig it, jb weld....what is something that will work very well?

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1983 Kawasaki KZ 1100 A2 - streetfighter

Fixing small cracks on aluminum engine parts 21 Feb 2009 22:10 #266993

  • timebomb33
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i've had good luck with jb weld in the past but depending on the size of your wallet i probably would look for anew or quality used one as ive never had any luck welding crack up in oil soaked alloy plus the extra heat can and often will warp the gasket surfaces so then you would have to machine it true again.if you jb weld it give it lots of time to cure and try to do both sides of the crack internal and external.

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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE

Fixing small cracks on aluminum engine parts 21 Feb 2009 22:50 #267011

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yeah i dont know where to find another stator cover....I've been looking on ebay...I will JB it, and if that doesn't work...then i will tig it...

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1983 Kawasaki KZ 1100 A2 - streetfighter

Fixing small cracks on aluminum engine parts 21 Feb 2009 22:52 #267012

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what motor thought i saw one on e-bay.
how duz jb weld hold up to heat?

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Fixing small cracks on aluminum engine parts 21 Feb 2009 23:06 #267017

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Here's my three cents. The best stuff I have ever used to repair or patch alum. is called Devcon. It comes in two cans, mix them together and it starts smoking. (it makes you feel evil) I have seen other people patch cases and even make new fins to replace old broken ones. It comes in three different types. Alum, Steel, Cast Iron. People have even used it to patch blocks on tracters. The only hold back is it costs about $25.00 or so! (yes you can get a new cover cheaper) But the two cans will last you for a long time. Maybe not if you blow up alot of stuff.

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Fixing small cracks on aluminum engine parts 21 Feb 2009 23:12 #267020

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devcon does work well we sometimes use it to raise the floors in the intake ports when porting the reason i suggested the jb weld is that it's readaly available and it does hold up quite well to oils and heat and it is easy to work with [filing and sanding] and would cause any distortion like welding would and also everybody has heard of it or used it at some time in there lives.

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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE

Fixing small cracks on aluminum engine parts 21 Feb 2009 23:14 #267021

  • Darkangel
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Devcon Aluminum Liquid F-2

makers of permatex.....is this the stuff...it's 45 bones

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Fixing small cracks on aluminum engine parts 22 Feb 2009 00:37 #267036

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Darkangel wrote:

Devcon Aluminum Liquid F-2

makers of permatex.....is this the stuff...it's 45 bones


Never used liquid, it's a paste. I don't about permatex...It could be that high in price. Just put that out there for those who don't know.

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Last Edit: by kzz1p.

Fixing small cracks on aluminum engine parts 22 Feb 2009 08:00 #267086

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Not to highjack the thread but do you think that devcon would hold this very good? would it be sturdy enough to fix this?

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1978 KZ650 B2

Fixing small cracks on aluminum engine parts 22 Feb 2009 08:23 #267091

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twfields79; I would have that welded. It won't cost much, and you won't have to worry about it breaking again. Ed

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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

Fixing small cracks on aluminum engine parts 22 Feb 2009 08:35 #267096

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Okay well wouldnt that be braizing? And you think it would be fairly inexpensive?

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1978 KZ650 B2

Fixing small cracks on aluminum engine parts 22 Feb 2009 09:07 #267104

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Not brazing. That piece looks like aluminum, but I can't tell for sure. If it is, aluminim can be welded using Shielded Metal Arc Welding (SMAW) - also known as stick electrode welding or Tungsten Inert Gas (TIG) or Gas Tungsten Arc Welding process (GTAW) - also know by old guys like me as heliarc welding. Welded aluminum is very strong. It shouldn't cost much to have that small piece done, but call around first to get pricing. Ed

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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

Fixing small cracks on aluminum engine parts 22 Feb 2009 10:54 #267142

  • timebomb33
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what caused it to break in the first place try to fix that problem first so after you get it welded it will hold

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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE

Fixing small cracks on aluminum engine parts 22 Feb 2009 11:29 #267153

  • twfields79
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Actually I am not sure what caused it to break they are rearsets off a zx7 I bought used so previouse owner did it....

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1978 KZ650 B2

Fixing small cracks on aluminum engine parts 22 Feb 2009 11:53 #267160

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So that being said is this made out of aluminum?

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1978 KZ650 B2

Fixing small cracks on aluminum engine parts 22 Feb 2009 16:14 #267247

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Are you sure heliarc welding will work on cast aluminum?

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1978 KZ650 B2

Fixing small cracks on aluminum engine parts 22 Feb 2009 19:39 #267331

  • Darkangel
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you can actually mig aluminum too....I've done it a many of times on live all trailers and trailer doors...good penetration is a must, and you have got to know what your doing, and have the right gas mix which you can find on the internet....

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1983 Kawasaki KZ 1100 A2 - streetfighter

Fixing small cracks on aluminum engine parts 22 Feb 2009 20:02 #267344

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twfields79 "Are you sure heliarc welding will work on cast aluminum?"

I had the entire cast aluminum transmission/engine case heliarc welded on my old BSA after I broke it (please, don't ask how, it's embarassing) and never had any more problems with it. I suggest you do a little web surfing on the subject to get a fuller picture, but here's one site with a description:

Welding

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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

Fixing small cracks on aluminum engine parts 23 Feb 2009 05:20 #267414

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Thanks guys......

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1978 KZ650 B2
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