smoke

[Pauly]

I checked the tube on the value cover it was always a little bent. Greg are you talking about the thing on the top of breather tube. (the can with the wing nut?)

Thanks

 

[Pauly]

I checked the tube on the value cover it was always a little bent. Greg are you talking about the thing on the top of breather tube. (the can with the wing nut?)

Thanks

 

[greg_g]

Correct. You can either take the whole thing off the side of the block, or you can just remove the cover and take out the screens for cleaning. Me, I prefered the whole thing cleaned - which means removing it from the block temporarily.

I think I recall a few Y380/385 owners before also tracking a faulty oil pressure reading down to a kink in that same plastic tube. Just a little factoid that might come in handy some day.

//greg//

 

[greg_g]

Correct. You can either take the whole thing off the side of the block, or you can just remove the cover and take out the screens for cleaning. Me, I prefered the whole thing cleaned - which means removing it from the block temporarily.

I think I recall a few Y380/385 owners before also tracking a faulty oil pressure reading down to a kink in that same plastic tube. Just a little factoid that might come in handy some day.

//greg//

 

[Ranch_Hand_Supp]

</font><font color="blue" class="small">( I checked the tube on the value cover it was always a little bent.
Thanks )</font>

The tube on top of the valve cover has nothing to do with the engine oil pressure or engine oil gauge reading. But if it is bent / kinked enough to restrict ..... it will not allow the inside of the engine to breathe.

Ronald
Ranch Hand Supply

 

[Ranch_Hand_Supp]

</font><font color="blue" class="small">( I checked the tube on the value cover it was always a little bent.
Thanks )</font>

The tube on top of the valve cover has nothing to do with the engine oil pressure or engine oil gauge reading. But if it is bent / kinked enough to restrict ..... it will not allow the inside of the engine to breathe.

Ronald
Ranch Hand Supply

 

[RonMar]

The tube on the oil fill cap that runs over to the intake manifold places a vacume on the valve cover and crankcase when the engine is running. This vacume forces fresh air to be drawn IN through that breather filter on the side of the engine block. This airflow carries blow-by gasses and unburned diesel vapors from the crankcase up to the valve cover via the lube oil return passage and back to the intake manifold and re-burns them in the engine. This is important as a buildup of diesel vapors that have leaked past the rings can lead to a crankcase explosion. Not very common in diesels of this size but the possibility does exist if not properly vented.
Under heavy load/higher RPM, the quantity of blowby gasses may exceed the ammount of vacume and flow through the crankcase and might lead to a little bit of puffing from the breather. Coolant/water leaking into the crankcase and being vaporized/expanded there would probably make this show up easier. A kinked hose or leaks around the valve cover, oil fill cap and the tube/hose on top would also lead to less fresh air flow through the crankcase. If I was seeing other than occasional puffing from the breather under heavy load, I would be checking those things, the cooling system integrity and the cylinder compression.

 

[RonMar]

The tube on the oil fill cap that runs over to the intake manifold places a vacume on the valve cover and crankcase when the engine is running. This vacume forces fresh air to be drawn IN through that breather filter on the side of the engine block. This airflow carries blow-by gasses and unburned diesel vapors from the crankcase up to the valve cover via the lube oil return passage and back to the intake manifold and re-burns them in the engine. This is important as a buildup of diesel vapors that have leaked past the rings can lead to a crankcase explosion. Not very common in diesels of this size but the possibility does exist if not properly vented.
Under heavy load/higher RPM, the quantity of blowby gasses may exceed the ammount of vacume and flow through the crankcase and might lead to a little bit of puffing from the breather. Coolant/water leaking into the crankcase and being vaporized/expanded there would probably make this show up easier. A kinked hose or leaks around the valve cover, oil fill cap and the tube/hose on top would also lead to less fresh air flow through the crankcase. If I was seeing other than occasional puffing from the breather under heavy load, I would be checking those things, the cooling system integrity and the cylinder compression.

 

[greg_g]

</font><font color="blue" class="small">( The tube on top of the valve cover has nothing to do with the engine oil pressure or engine oil gauge reading. )</font>

This is nothing I've personally witnessed Ron. But others HAVE reported tracking down a low oil pressure reading to a kink in that piece of clear hose. It's been mentioned in this forum and in others. Straighten out the kink, oil pressure indication on the gauge returns to normal. Don't ask me to explain it, I'm only reporting what I've read here and on other help sites.

//greg//

 

[greg_g]

</font><font color="blue" class="small">( The tube on top of the valve cover has nothing to do with the engine oil pressure or engine oil gauge reading. )</font>

This is nothing I've personally witnessed Ron. But others HAVE reported tracking down a low oil pressure reading to a kink in that piece of clear hose. It's been mentioned in this forum and in others. Straighten out the kink, oil pressure indication on the gauge returns to normal. Don't ask me to explain it, I'm only reporting what I've read here and on other help sites.

//greg//