[AT] Weird broken crank(not the 430!)

[k7jdj at aol.com]

 at the flywheel end, not the impeller end.

Is it possible the flywheel was loose or the key stripped?  I had the bright idea once to put never seeze on the taper where the flywheel mounted because I had such a hard time getting it off.  The engine fired exactly one time and sheared the flywheel key.  That put it badly out of time so it wouldn't run after just one pop.

Gary


 

 

 

-----Original Message-----
From: Spencer Yost <yostsw at atis.net>
To: Antique tractor email discussion group <at at lists.antique-tractor.com>
Sent: Tue, Aug 1, 2017 6:26 pm
Subject: Re: [AT] Weird broken crank(not the 430!)

It's on a lawn vacuum, and it was running fine.  My wife was operating it so I didn't hear it.  She  said it just stopped, making a bunch of noise in the process.   The crack occurred right behind the bearing, inside the crankcase at the flywheel end, not the impeller end.

There was a good level on the dipstick and an oil change in the winter so it was not oil related.

Spencer Yost

> On Aug 1, 2017, at 9:05 PM, vschwartz1 at comcast.net wrote:
> 
> Spencer; I do not have any real knowledge about this kind of break but it would appear to me that one side or the other would be smooth. I simply have a case of nose trouble. What was the engine doing when the crank broke? Was the break at the throw? For both pieces of the crank to be like that photo looks I would think there must have been some end play. Maybe that is a normal thing, now define normal. 
> Just wondering, 
> Gil 
> 
> ----- Original Message -----
> 
> From: "Spencer Yost" <yostsw at atis.net> 
> To: at at lists.antique-tractor.com 
> Sent: Tuesday, August 1, 2017 6:04:09 PM 
> Subject: [AT] Weird broken crank(not the 430!) 
> 
> I have a small Briggs that broke a crankshaft yesterday. The weirdest thing I've ever seen. Have you ever seen a crank break and leave this type of a star pattern on both ends? 
> 
> 
> 
> [image/jpeg:image1.JPG] 
> 
> 
> 
> Spencer Yost 
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