Is this a crack or just casting????

shanderson62 · Sep 30, 2009

03 mountain cat 900. broke a piston on the mag side. Split the crankcase to put in new crank seals and found this.... It looks to me like a crack. Right behind this "crack" is the coolant jacket. I have not found a reason why the piston broke yet, but if this is a crack then problem solved... thanks

Engine Pro 5x · Sep 30, 2009

Spray some carb cleaner on the area then take a blow gun and blow at a 90* angle to the area. The air won't blow the cleaner out if it's a crack as it will show up as a wet line >>>>.

Rixster · Sep 30, 2009

Looks like a crack to me.

KMMAC · Sep 30, 2009

Or, take some metal grindings place on the inside of case and put a low power magnet on the out side, if the grindings pull up to the line then most likely it's a crack. Cheap magna flux method.

Joks79 · Sep 30, 2009

could be a vein in the cast.

1Mike900 · Sep 30, 2009

Was there any coolant in that side of the crank case? You could find someone nearby with penetrant solution to see if it is a crack? Idacatman would be the one to contact! Has it ever froze due to lack of antifreeze? Could be ground out and welded up?

Mike

HILCLMR · Sep 30, 2009

Crack

Looks like a crack to me, no biggie tho. Grind it out and have it welded up.

shanderson62 · Oct 1, 2009

thanks for the good tips, i took it to work and one of the welders determined it is not a crack just casting. My next problem is the counterweight on the mag side has been rubbing on the case. Can anyone tell me the specs for crankshaft end play? thanks again

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Is this a crack or just casting????

shanderson62

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Engine Pro 5x

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Rixster

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KMMAC

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Joks79

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1Mike900

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HILCLMR

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shanderson62

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