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GtWtNorth


https://t.me/pump_upp

Location: https://t.me/pump_upp
Joined: Nov 16, 2008
Points: 264

Cracked aluminum crankcase repair options?
Original Message   Nov 21, 2012 9:50 pm
I picked up a nice clean 3000 watt generator from CL with a small crack in the bottom of the crankcase that allows the oil to drain out slowly (fell off the back of a pickup). Any one have any suggestions/experience for repairs other than welding? I'm hoping maybe Devcon, JB weld or some metal epoxy?
The motor is a clone, Lifan 168F2 196 cc and parts seem to be quite rare. The manufacturer will ship a replacement crankcase for $62.00 + transport, which is probably close to what I would pay to have it welded.
Thanks

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GtWtNorth


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Location: https://t.me/pump_upp
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Points: 264

Re: Cracked aluminum crankcase repair options?
Reply #21   Nov 30, 2012 3:29 pm
It seems like I was lucky after all. I filled the cracked oil drain hole with JB weld and buttered up the drain plug before screwing it in. Nnow that it's hardened, the leaking seems to be stopped(knock on wood). The  cracking is limited to the corner base area & didn't propagate through the case.



So I'll close her up & fill with oil to confirm. Let you know how it goes.

Cheers

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mkd55


Location: wisconsin
Joined: Dec 16, 2005
Points: 155

Re: Cracked aluminum crankcase repair options?
Reply #22   Nov 30, 2012 3:53 pm
gtwt! you also could jb weld all the wells(valleys) where the cracks are visible in the pics. i filled the whole cavity  adjacent to the drain plug casting.
Bill_H


Location: Maine
Joined: Jan 12, 2008
Points: 354

Re: Cracked aluminum crankcase repair options?
Reply #23   Nov 30, 2012 9:28 pm
I would just Alumiweld it. Should be a lot stronger.

Who the hell let all the morning people run things?
GtWtNorth


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Re: Cracked aluminum crankcase repair options?
Reply #24   Nov 30, 2012 9:44 pm
mkd55, - I may still fill those cavities for the extra support.

Bill_H, I looked at the Alumiweld for a long time but the feedback I've seen doesn't give me a warm feeling. Plus I only have a propane torch so it would take a while to heat such a large mass, if it was possible. Plus I am too lazy to strip it right down to the casting so I'd be worried about how the heat would affect the other components, bearings & gaskets.


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niper99


Location: London Ont
Joined: Dec 2, 2007
Points: 354

Re: Cracked aluminum crankcase repair options?
Reply #25   Dec 2, 2012 1:56 am
jtclays wrote:
Niper, Not to be rude, but would you be able to braze this for a customer for less than the $62 crankcase replacement?



l would agree money better spent on a new block espically at that price!!!... and i would probably charge $75-125 for a repair like this one.. but if u wanted to repair it...then brazing it in my opinion is the only permanent solution...

Moderator Denis


Location: CAN
Joined:
Points: 638

Re: Cracked aluminum crankcase repair options?
Reply #26   Feb 3, 2013 12:21 pm
I used JB Weld once, it was for filling crack on a ford 302 head it was leaking right front corner , It was not only the gasket, the engine has already 300,000KM so i did want to redone the heads, so I use JB weld and telling you I sold the van and the guy still running it with the repair and still not leaking.

This message was modified Feb 3, 2013 by Denis



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