What would cause a piston to look like Bill Murray's face?

[framtam]

What's missing in that picture is mostly caked on the cylinder head.

And I can only imagine the bottom of the piston looks worse, and is what caused the .50 cal sized bullet hole in the bottom crankcase



I had some issues with this sled before the blowout, but I don't know if it's related or not as it ran fairly good the few outings before the blowout.

Other cylinder looked like a normal person's face.

 

[Riverjet]

Leaned out meltdown. Not an oil issue.

 

[tex78]

bottom end bearing chunk went up top .... happened to mine [ well not with the hole in the bottom end cases ] ......

 

[Polarblu]

you dropped a piston skirt, crank will need to be rebuilt, block is toast. hole is cause by big piece of piston falling into a place where only small pieces fit. Kerblammo!!!

 

[Polarblu]

i would say no, cause the damage is the same all the way around, not at the exhaust side, and the blown out block says a piece fell off.

reply to riverjet

 

[Himark]

Bill Murrays reflection looking at it?

 

[tex78]

i would say no, cause the damage is the same all the way around, not at the exhaust side, and the blown out block says a piece fell off.

reply to riverjet

x2 .... def not a lean issue .... or deto

 

[tukernater]

bad gas? Det,def has broken skirt.

 

[shoppingcart111]

I would say thats more of a Bryan Adams facial type failure.

 

[Murminator]

I would say thats more of a Bryan Adams facial type failure.

Yup I'd say it more like Bryan Adams face was on fire and someone tried to stomp it out wearing golf shoes.....

 

[barleyfarmer]

Bearing failure and or skirt broke off.Actually had a skirt punch a hole on the bottom of the cases!Doesn't look like a lean failure because of the sharp edges on the marks and there would be more evidence of melting on the exhaust side.

 

[Warhawk]

looks like a bomb

 

[senorjeem]

JB Weld and lipstick on that pig!!

 

[pipes]

Looks like severe detonation to me. but why only one cylinder?

 

[Riverjet]

i would say no, cause the damage is the same all the way around, not at the exhaust side, and the blown out block says a piece fell off.

reply to riverjet

Aww man. I hate being wrong.

 

[OnlyPolaris]

I would say detonation as well.

 

[maxwell]

arent you the guy that couldnt get your sled to run right after you let it sit on the mountain? is this why or did this happen after>?

 

[barleyfarmer]

Detonation would be more pitting in the center of the piston and to the exhaust side!Detonation is more of a melting effect like welding slag! Something got into that cylinder!Had a buddy's 04 800 rmk drop an exhaust valve into the cylinder!We found it in the pipe he still swears that it kept running after it happened!!Looked like a penny off the train tracks!

 

[tukernater]

Detonation would be more pitting in the center of the piston and to the exhaust side!Detonation is more of a melting effect like welding slag! Something got into that cylinder!Had a buddy's 04 800 rmk drop an exhaust valve into the cylinder!We found it in the pipe he still swears that it kept running after it happened!!Looked like a penny off the train tracks!

Det is always the outside, the thinnest part of the piston hence why the piston pin always falls out.CAUSE Bad gas CURE Better gas .

 

[Modman]

Leaned out meltdown. Not an oil issue.

I would agree. The fact that the rest of the piston is caked onto the cylinder head is the #1 sign that the piston DID in fact get hot enough to melt and unlikely that it was debris that just bashed around in the cylinder. Ski Doo motor with around 3,000-4,000 kms? Suspected cause - Lower rod bearing went and allowed the rod to then hit the case, caused an air leak and melted the piston. Was it running like a diesel (banging and clanging) just before it grenaded?