Viper Center Cylinder Burned Down

Ok, just got into it more, pulled the center cylinder and found that the connecting rod lower bearing(bearing on the crank) is completely disintegrated. the connecting rod will move up and down independent of the crank by a good 3/8". I have attached pictures of the piston out of the bore as well as a pic of the crank as best as I could. No my question is did the bearing let go and cause the piston to start to slap around in the bore and take out the piston or what? The cylinder walls show very little damage(not usable though) but nothing like I would suspect from losing that crank bearing like that!
 

Attachments

  • CIMG0948.JPG
    CIMG0948.JPG
    88.4 KB · Views: 11
  • CIMG0947.JPG
    CIMG0947.JPG
    112.4 KB · Views: 4

Suprx125 said:
Huh? May not be the best built ever, but they are a lot better than others period. I have 9100 miles on mine and have never had one problem. Like anything else with an engine, do your proper maintenance and use the correct fuel. Not the engines fault they guy ran sub par fuel. Like Mr Viper said, he was lucky to have made it this long.
Click to expand...

Exactly. With all of the warnings and horror stories from others who have chosen to run low octane it honestly baffles me that people still are too cheap to spend an extra 10-20 cents/gallon for good premium fuel.

If the extra $2-4 per fill-up is too much of a financial burden you're in the wrong sport that's for sure.
 
Got further into it again today. Found that the center cylinder wrist pin bearing seemed like it had either a stuck pin or had no oil before I pulled the wrist pin, very gritty feeling when moving the piston. The other cylinders felt fine. I pulled all three pistons off and found that the mag and pto connecting rods have the nice copper color to them. The center rod is much more gray/copper. The wrist pin bearing is fine and intact but it too is a gray metal look instead of the copper look of the other wrist pin bearings. Is this from the extreme temperatures that this cylinder only experienced? I haven't split the cases yet to look at the lower end but from above the lower connecting rod bearing just looks like it is totally disintegrated.
 
detonation will beat the rod and wristpin bearings to death in no time. I still feel it's the root cause of the damage. also whats that to the far left in the first pic? is it just something laying on the base gasket?
 
You must log in or register to reply here.


Back
Top