Crankshaft Pics

davbell22602

davbell22602

Lawn Addict
Tecumseh HMSK85-155901A
Sears 247.888500 MTD snowblower

This my personal project snowblower I bought back in fall 2012. Bought it and pushmower for $45. Snowblower threw a rod and cracked the block. Pulled crankshaft cleaned it up some. Its not perfectly smooth but not extremely grainy either. Measured the crank rod journal at 1.371 diameter (in the middle) and 1.374(outside). The crank rod journal spec is 1.374-1.3745. Crankshaft is NLA. I wanna gamble and reuse the crankshaft but I also dont want to throw another rod either. I already have used bare block coming.

Here's pics of the crankshaft rod journal.

IMG_20140105_104720_534_zpsf0y7214f.jpg


IMG_20140105_104622_231_zpsq2szm30q.jpg


IMG_20140105_103956_886_zpsvochthbq.jpg
 
I would not use that crank without a lot of cleaning and then remeasuring to see how far out of specs it is. A new rod won't last very long on that crank the way it is. Also check to is if it is out-of-round. I'm betting that after cleaning it will be.
 
Muriatic acid will clean the aluminum off, but I think I see some galling on the shaft, which will take some sanding and buffing to get out. This will reduce the shaft size.
 
Rivets said:
Muriatic acid will clean the aluminum off, but I think I see some galling on the shaft, which will take some sanding and buffing to get out. This will reduce the shaft size.
Click to expand...

I can clean aluminum off. Then I will probably chance it use it the way it is afterwards.
 
Yeah, it looks like it is just pasted on aluminum, take it off, and you should be good to go.
 
Just take the sandpaper and the crank, and buff while you set at the computer, it will eventually buff out.
 
Soak the crank in the acid, don't sand. Acid will only remove the aluminum, while sanding will remove aluminum and iron, changing the diameter.
 
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