Cummins QSB 6.7 426 parts manual

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I want to take the rocker cover off to clean the oil coming out of the breather......in the hope that it’s only oil left over from the engine service.....and not oil coming up from the sump through the rings. So I was hoping for a nice exploded diagram so that I don’t find anything surprising that I wasn’t expecting
 
Bouba said:
I want to take the rocker cover off to clean the oil coming out of the breather......in the hope that it’s only oil left over from the engine service.....and not oil coming up from the sump through the rings. So I was hoping for a nice exploded diagram so that I don’t find anything surprising that I wasn’t expecting
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With a Bendy toy, just turn the boat upside down ,if the rings are passing oil will come out.
 
Bouba said:
I want to take the rocker cover off to clean the oil coming out of the breather......in the hope that it’s only oil left over from the engine service.....and not oil coming up from the sump through the rings. So I was hoping for a nice exploded diagram so that I don’t find anything surprising that I wasn’t expecting
Click to expand...
Not sure if you’ve tried this.. If I’m looking for any info Cummins marine related, I start here… Cummins QSB 6.7 Specifications
 
Jerbro said:
Not sure if you’ve tried this.. If I’m looking for any info Cummins marine related, I start here… Cummins QSB 6.7
Click to expand...

Bouba said:
I want to take the rocker cover off to clean the oil coming out of the breather......in the hope that it’s only oil left over from the engine service.....and not oil coming up from the sump through the rings. So I was hoping for a nice exploded diagram so that I don’t find anything surprising that I wasn’t expecting
Click to expand...
Why do you need to take rocker cover off to clean externally?
 
I have actually got the free parts manual to download....it turned out the reason I couldn’t download it before is that my iPad is woefully out of date. It did successfully download on my IPhone Mini....unfortunately I really struggle to see it because the screen is so small...for some reason I thought that having a phone that fits easily in my pocket was the only useful buying criteria. The wife said I can have a new IPad.....perhaps she feels sorry for my enfeebled state🤷‍♂️😳🤔
Thank you everyone for your useful assistance......😀
 
Bouba said:
The oil is coming out of the breather hole....so I need to clean the oil inside....if I remove all trace of the oil and it still comes out...then I might be in trouble
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I'm struggling to understand. Shouldn't the oil drain itself back to the sump? There should be no excess to come out of a breather?
 
Oil inevitably ends up in the rocker cover as it escapes from the parts under the cover that are being lubricated, as such you cannot clean it out and hope for it to remain clean...... oil splashes around inside it normally however if there is oil coming out of the breather its being pushed out by pressure of air and gases.
 
Bouba said:
I have actually got the free parts manual to download....it turned out the reason I couldn’t download it before is that my iPad is woefully out of date. It did successfully download on my IPhone Mini....unfortunately I really struggle to see it because the screen is so small...for some reason I thought that having a phone that fits easily in my pocket was the only useful buying criteria. The wife said I can have a new IPad.....perhaps she feels sorry for my enfeebled state🤷‍♂️😳🤔
Thank you everyone for your useful assistance......😀
Click to expand...
Don’t have the Ipad you might need an engine.
 
Freebee said:
Oil inevitably ends up in the rocker cover as it escapes from the parts under the cover that are being lubricated, as such you cannot clean it out and hope for it to remain clean...... oil splashes around inside it normally however if there is oil coming out of the breather its being pushed out by pressure of air and gases.
Click to expand...
Yes, I wasn’t planning to polish the rockers or anything drastic…just to see if it is due to overfilling during the last service…if the oil is coming up through a cylinder then there is trouble
 
Bouba said:
I have actually got the free parts manual to download....it turned out the reason I couldn’t download it before is that my iPad is woefully out of date. It did successfully download on my IPhone Mini....unfortunately I really struggle to see it because the screen is so small...for some reason I thought that having a phone that fits easily in my pocket was the only useful buying criteria. The wife said I can have a new IPad.....perhaps she feels sorry for my enfeebled state🤷‍♂️😳🤔
Thank you everyone for your useful assistance......😀
Click to expand...
Why don't you send the download from your phone to your ipad then you can read it?
 
Bouba said:
Yes, I wasn’t planning to polish the rockers or anything drastic…just to see if it is due to overfilling during the last service…if the oil is coming up through a cylinder then there is trouble
Click to expand...
over filling will show up on the dipstick won't it.....as soon as you pour it in the rocker cover it runs down into the sump even on the coldest day oil entering the rocker cover will end up in the sump within 60 seconds-its all connected-however if you have oil coming out of the breather its being pressurised by the engine internals as they rotate-you need to look at the breather system as a whole and see what is making the engine internals pressurise
 
Freebee said:
over filling will show up on the dipstick won't it.....as soon as you pour it in the rocker cover it runs down into the sump even on the coldest day oil entering the rocker cover will end up in the sump within 60 seconds-its all connected-however if you have oil coming out of the breather its being pressurised by the engine internals as they rotate-you need to look at the breather system as a whole and see what is making the engine internals pressurise
Click to expand...
Yes I agree….which is why I was looking for the exploded parts manual so I could identify everything that I need to check
 
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