Strong smell YM1510D/ what is this for?

[Jjpbe]

Hi all,
I have a strong smell/ horrible smell when my YM1510 is working at high power especially. I am trying to find out where it is coming from. I changed already the exhaust, oil etc. but until now I can’t find the problem. My 1510D does not have excessive white or black smoke. Today I discovered that there is a bit of smoke coming from a plastic tube which goes from the top of the engine ( next to the oil filler cap) to the bottom . I am wondering what this plastic tube is for? I have attached some pictures to clarify. Anyone who knows the purpose of this tube? Is it supposed to be from plastic? Could this be the reason of the smell with hot exhaust gases going through it?
Thank you very much for your help,
Jjp

 

[Travis_R]

Crank case breather vent tube. Excessive blow-by? Does your engine oil look milky?

 

[winston1]

here is a video showing to much blow by coming out that tube.

 

[Jjpbe]

@Travis_R. Not really , the engine oil does not look milky.
Is it ok that this tube is from plastic??

 

[winston1]

@Travis_R. Not really , the engine oil does not look milky.
Is it ok that this tube is from plastic??

This sight lists it as vinyl so I would say yes to your question. https://www.lsengineers.co.uk/pipe-vinyl-for-yanmar-3tna72l-engine-23065-120500.html

 

[Jjpbe]

Thanks for the replies. This could not give the strong smell then…..

 

[ponytug]

@Jjpbe Can you describe the smell in more detail? Is there a chance there is a dead animal somewhere that is the smell?

All the best, Peter

 

[careyo63]

My guess also. Dead Critter in it or close by. I keep outside cats.
Bio fuel. after burn? Elec. fan work!

 

[Jjpbe]

No dead animal somewhere. Is it possible that the engine gets hotter than normal? It does not have a engine temp gauge..

 

[alexpops]

What does the coolant tank look like? clean/normal? oily/rusty/dirty? Is it a "sweet" smell, like antifreeze? burning smell? like a clutch or belts burning up? a little more description would be helpful.

Can you tell if it's coming from the exhaust or someplace else. Any new noises? (squealing)