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freakboy 08-04-2009 12:05 AM

****ing Peice Of **** Briggs Crank Case!!!
Well i was puttiin my 20 hp briggs back together and i was tightining down and it wouldnt go so i started tighteing all the bolts got to one and SNAP the damb peice of **** snaped and now theres a big *** crack/hole. the case appears to be cast alum. can i take it to the shop up the road and get them to weld it back together? or should i just get a new one?

vandancouver 08-04-2009 12:09 AM

**** man 20 hp briggs? lets see apic of what its on

also, cast alum is pretty weak. im a glazier (glass and metal, mostly aluminum) and the cast is weak ****. we have door pivots that are cast, if you drop one off a 4 foot ladder it will snap. i dont know man about fixing no welder so im not sure. i guess i would try it and see what the price difference is.

good luck

Carlman 08-04-2009 01:30 AM

:useless: And yes it is possibe depending on size of the hole

moetrout 08-04-2009 05:58 AM

I've seen it done before, but that was a dime size hole on a 5hp.

freakboy 08-04-2009 11:49 AM

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here the pics this fixable?

moetrout 08-04-2009 12:44 PM

Ewe! I thought you said hole, not a big chunk taken off the edge! My guess is no. Now if you could do it yourself or a friend would do it for free then I certianly would try it, but I would not pay.

freakboy 08-04-2009 01:06 PM

the guys up the road might be able to do it for free. if its not free it will be cheep. they might even mill the top so its flat.

Affair_driven 08-04-2009 05:32 PM

Were mating surfaces in contact with each other when casting snapped?

lemegacool 08-04-2009 05:38 PM

MAYBE alu tig weld would work... but not sure on cast... or you could try one of those alu brazing rod : might worth a try

freakboy 08-04-2009 05:39 PM

alright well lastnight i was working on it around 2 and me and my freind were gettin it all back together and of course this freaking happend. im so ****ed off as soon as it did that i freakin kicked a damb vise that weighs like 70 pounds.

and no for some reason they were stuck half an inch away from eachother and i was goin around in a cris cross patern and i started tighnin this one and SNAP

moetrout 08-04-2009 06:31 PM

Durafix sucks eggs!

freakboy 08-04-2009 06:32 PM


Oh yeah would jb weld work for this hahahah?

t0x1k 08-04-2009 06:43 PM

You're better off duct taping it.
Welding cast iron is hard enough. Aluminum has to be harder.

Why exactly were you tightening it without the case being closed?

Affair_driven 08-04-2009 06:46 PM


or some reason they were stuck half an inch away from eachother and i was goin around in a cris cross patern and i started tighnin this one and SNAP
Have you figured out the problem as far as assembly goes?
If all is correct, case should just fall together without brute force.
Was this part of case difficult to separate to begin with?

freakboy 08-04-2009 06:46 PM

everything was in place but it wouldnt go down. and ryan didnt like me hitting it with a hammer to get it in. lol i had a block of wood.

yeah it was kinda hard to get it off the first time i pryed it up with a crow bar hhahaha.

Affair_driven 08-04-2009 07:14 PM

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Before pouring $$$'s into repair, try to assemble case to get a "feel" for how it should fit.
I use a plastic mallet for tough to assemble (or disassemble) parts.
Lightly tapping around perimeter of case should help it to come together.
To try to wrench down an aluminum casting is asking for trouble. Not built for that kind of stress, as you have discovered.

freakboy 08-04-2009 07:26 PM

thing is i had the case together before then i took it off cleaned all the surfaces and stuff and im wondering if i seal it up if all the bolts will hold it in the right spots and since that has a bolt hole there just put it in there to close it up.

Affair_driven 08-04-2009 07:33 PM

I'd be concerned about the crowbar stuff.
What did that do to parts...?
Also, were these parts gasketed, or do they use an anaerobic sealant?

freakboy 08-04-2009 07:36 PM

they had gaskets on em. everything looked fine after i used the crowbar(gently) and it was a small one to. i have 3 gaskets exactly like the thing there and 3 that are nothign like it lol

Affair_driven 08-04-2009 07:47 PM

If it were my engine I think I would replace the snapped case.
If that's not possible, use the old case "as is" and gob on the JB Weld. Fully clean area with alcohol before applying the stuff.

freakboy 08-04-2009 07:52 PM

should i just ask if the shop up the road could do it for free or cheap?

lemegacool 08-04-2009 07:54 PM

bring them and ask if they can... thats free lol

freakboy 08-04-2009 08:20 PM

yeah i guess lol.

toofarnorth 08-04-2009 08:38 PM

If it was mine I'd bevel the edge of the crack then bolt the cases together with that piece in place and have them weld all but the edges where it contacts the other case then take it apart and finish the welds, that would insure the piece doesn't get welded in crooked. Of course that all depends on you finding a competent welder that will work for a dozen donuts.

freakboy 08-04-2009 08:54 PM

around here if you have all the stuff people will lay beads for you cause there freind got ball joints pressed in for like 5 bucks lol.

BAMBY 08-05-2009 01:19 AM

if they have a tig welder, it should be very possible, i know its possible to weld cast aluminum... same as welding lifter bores in 5hp briggs. i like the idea of bolting it all together then welding so its straight on there. like toofarnorth said.

also the first time i took my 5hp briggs apart, i used the claws of a hammer to pry it off, i got the engine after it sat outside in rain/weather for 2yrs, and the crankshaft was rusty around the point of the oilseal, making it really hard to get off.

try seeing if yours is rusty there too, i sanded mine with sand paper, not too much tho, just to take the rust off, the put a little oil on it.

Good luck,

Affair_driven 08-05-2009 03:31 AM

If welded, no matter how good it is, mating surfaces will have to be machined flat.

frederic 08-05-2009 06:08 AM

You'll have to deck the mating surfaces after the repair.

Durafix works very well for those who know how to use it, and this is the exact situation durafix is marketed for, but there are a couple of tricks.

Use an oxy/map torch rather than straight propane. Aluminum wicks heat away from the repair site very quickly so keeping enough heat in the repair area will be difficult.

With durafix and similar products, cleanliness is your friend. Wiping it with a rag is not good enough as dirt attracts the durafix for an incomplete joint. Clean, clean, clean then finish off the area with brake cleaner as it evporates entirely.

I would put the piece back, clamp it in place, then using an angle grinder notch the crack joint a little bit and solder that with the durafix rods so I could get more penetration/wicking into the joint.

Cast aluminum can be welded by a practiced tig welder or with a nickel-based rod using an oxy/acetelyne torch. *I* can't do it but cast aluminum is welded all the time in the automotive industry. Aluminum engine blocks and cylinder heads are cast, as are some power steering pump cases, alternator cases, and so on.

toofarnorth 08-05-2009 08:55 AM

I know someone that soldered aluminum together with durafix then tried to destroy it and he couldn't get the repair to fail, so I would give it a try on this repair if you can find some.

freakboy 08-05-2009 12:03 PM

were can i get some of this durafix? and do u just heat up what ever then apply it then it melts in like solder?

Pellethuntr2 08-05-2009 01:24 PM

Where did you get a 20hp horizontal??? sounds like a beast

freakboy 08-05-2009 02:16 PM

its a vert. and i got it off my mower that i was gona use to screew around but i think my kart would be a better more fun home for it!

frederic 08-05-2009 02:43 PM


Originally Posted by freakboy (Post 55855)
were can i get some of this durafix? and do u just heat up what ever then apply it then it melts in like solder?

What you do is heat the work, pull the flame away, then dab the rod into the crack. If it doesn't dab, pull the rod away, keep heating, then dry again.

They also sell special crayons that melt a hair before it's hot enough for those new to durafix.

NEVER HEAT THE ROD. Only the work!

freakboy 08-05-2009 03:15 PM

I think my freind has some of that or the equivilant of it. and he also has a gass torch ill have to call him up and go over there one of these days tell him if he lets me use his torch and one of them rods ill fix his messed up kart.

Pellethuntr2 08-05-2009 06:45 PM

I see thanks for the info FB... I'm guessing u converted it to horizontal???

freakboy 08-05-2009 06:47 PM

no its vert im thinkin about ripin the pinions out of the transaxle on the mower this origionaly was on.

crazycart 08-05-2009 06:55 PM

i've tried this stuff on engine need one **** hot torch for cases...

freakboy 08-05-2009 06:58 PM

then ill go to my other freinds who has a big oxy act rig lol

freakboy 08-05-2009 08:28 PM

well i asked my dad if we could go out and get some tomorrow after work. he told me look in the tool box. and what do u know we have it lol. i still need to go out to get a torch tho hopefully tomorrow!

pmat 08-05-2009 08:45 PM

did something similar. jb weld did the trick

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