.: XT660.com - The #1 XT660 Resource :. - Strange noise in the engine

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- - Strange noise in the engine ( https://www.xt660.com/showthread.php?t=14820)

Holy crap, look at the colouring to one side of the con rod!

That must have been getting seriously hot in there for it to generate heat like that!

Primeiro apareceu um barulho estranho no motor,
esse video foi antes de levar a moto na oficina.

http://www.youtube.com/watch?v=2vUSdLec8yg
[video=youtube;2vUSdLec8yg]http://www.youtube.com/watch?v=2vUSdLec8yg[/video]

Primeiro pensei que era tucho ou valvula, quando cheguei na oficina o mecanico disse que era barulho de CORRENTE DE COMANDO, na revis�o foi constatado que a corrente de comando estava OK, ent�o o mecanico falou que poderia ser biela, levei em outro mecanico para ouvir o barulho e tb foi o mesmo veredito.
Ent�o deixei a moto na Yamaha para abrir o motor, ao desmontar a BIELA n�o foi encontrado nenhum problema.

http://i263.photobucket.com/albums/i...n/DSC00898.jpg

Mas foi encontrado uma ARRUELA solta na moto quebrada em tres peda�os

http://i263.photobucket.com/albums/i...n/DSC00915.jpg

No outro dia o mecanico "estudou" a arruela e todas as pe�as do motor e detectou que o desgaste da arruela foi na corrente de comando

http://i263.photobucket.com/albums/i...n/DSC00916.jpg

Da para observar o desgaste da corrente ro�ando na arruela, inclusive o "trilho" da corrente riscando a arruela.

http://i263.photobucket.com/albums/i...n/DSC00941.jpg
http://i263.photobucket.com/albums/i...n/DSC00921.jpg

Resumindo o problema foi encontrado..... Porem o peda�o que se soltou da arruela QUEBROU A TAMPA LATERAL DO MOTOR

http://i263.photobucket.com/albums/i...n/DSC00932.jpg
http://i263.photobucket.com/albums/i...n/DSC00930.jpg
http://i263.photobucket.com/albums/i...n/DSC00931.jpg
http://i263.photobucket.com/albums/i...n/DSC00927.jpg

Pois � o pedacinho que soltou da corrente bateu nessa engrenagem grande trincando o motor

http://i263.photobucket.com/albums/i...n/DSC00935.jpg
http://i263.photobucket.com/albums/i...n/DSC00934.jpg

S� resumindo, a arruela n�o � do motor pois a mesma � de INOX e no motor n�o tem arruela de inox, e revisei o catalogo 3 vezes pe�a por pe�a, tem arruela mas nenhuma com o furo pequeno

Sadly I'm far too ignorant to be able read the comments on the above pics, if anyone is enlightened and can translate I'd be very interested, great pics thank you.

The problem of noise was found, was loose in the washer motor in contact with the chain of command

Quote:

Originally Posted by arnilton (Post 137882)

The problem of noise was found, was loose in the washer motor in contact with the chain of command

where did that washer come from???

timing chain failure? seems like the washer was pin-balling round the engine, til it found a timing chain......

poor guy....the motors a mess..........

Quote:

Originally Posted by dazmatic (Post 137484)

Holy crap, look at the colouring to one side of the con rod!

That must have been getting seriously hot in there for it to generate heat like that!

The blueing of the crank web is normal, have a look at my Raptor conversion & you will see the same blueing on my crank.

Nice work at least you found the noise, thanks for showing us. How many KMs had the motor done?

My XT660 has only 21,000 km, and the engine was never opened