Technical Expert/Engineer from Yamaha Corp. NEEDED!

[00-NUKE]

I am looking to get a hold of a Yamaha Tech. or Engineer with expert advise on Nytro's. If there is one on this site, please respond. I have a case going with my insurance company and need an expert opinion on the operation of the Nytro 3-cylinder motor. Mine recently received a puncture to the oil filter and lost 2 quarts of oil causing the flywheel side connecting rod to go through the crank case. The top of the motor has been torn down by a local shop and my insurance company is claiming that it was due to mechanical failure because the cylinders are not scored from lack of oil. My question is.... What is the first to go on the Nytro 3-cylinder when it is starved of oil. What ever the answer is, I need to know.

Thanks!

Pete

 

[grizztracks]

The Yamaha engines I've worked on that ran low or out of oil failed at the piston wrist pin if running a roller rod bearing (atv) and at the rod bearing if running a babbitt style crank bearing (sleds).

 

[00-NUKE]

Technician

Are you associated with Yamaha Corp? And are talking about 2 strokes or 4 strokes? I've seen that out of 2 strokes only.

 

[jamesc]

if the rod failed from lack of oil so to speak the rod bearing will have been the first to go. if this failure is related to loss of oil pressure any mechanic worth his salt will be able to easily tell, the rod bearing should tell the story. you don't have to be associated with yamaha or any other manufacture to know/see that. engines are engines and bearings are bearings, run em out of oil and the results are all pretty much the same.

 

[09nytro]

Yes the Lower rod bearing would be the first to go if oil pressure drops I would have someone else check it out to get another opinion on it if another dealer is close . Not a yamaha rep. but worked at a yamaha shop and kawaski I have seen some jet skis too with lower rod bearing go south because of oil

 

[yam177]

if the rod failed from lack of oil so to speak the rod bearing will have been the first to go. if this failure is related to loss of oil pressure any mechanic worth his salt will be able to easily tell, the rod bearing should tell the story. you don't have to be associated with yamaha or any other manufacture to know/see that. engines are engines and bearings are bearings, run em out of oil and the results are all pretty much the same.

Agreed I am a professional auto Tech and yes the rod bearing would be the first to go. then the upper end last as there is still oil up there.

 

[00-NUKE]

Thank You!

Thank You all. I finally got through to the Regional Technician for Yamaha Motors and found out that the connecting rod is what generally goes bad. Often times there is little or "NO" sign of damage to the top end of the motor when there is a loss of oil pressure. The connecting rod will usually show some buleing of color and may look very much like a bad bearing. My Insurance agency has contacted Yamaha and I am now getting a new motor through a insurance claim. I'll be writing a full story on this once the repair is complete on things to watch out for including how not to get screwed by your insurance co. Mitch at Yamaha saved my A$$.
Thanks again!
Pete

 

[09nytro]

Thats awsome for you i'm happy for you