Blow by test for 370b

[David Diener]

Had a couple question on the blow by test for a 370b. I read Tony’s article on the test but have heard from other people that I should use a larger orifice when testing a 370B. I think it was .301 vs .221 orifice. Does it really matter? And if i use a larger orifice will that change the number im looking for, such as In water at the manometer. Also i believe the tests needs to be done while the engine is under load? So it needs to be running in the water vs a static test at their dock?

I have to pull my engine for transmission issues and figured might as well test blow by so if I have an issue it would be the time to address it.

 

Thanks for the help!

Topic

[Victor]

Like Tony said. Manage it through SeaBoard’s EnviroVent and go fishing.

[David Diener]

Yeah, I did try the oil cap test and it appears ok. Oil cap does not “fly into orbit”. Thanks guys

Dave

[Tony Athens]

I still don’t understand why you want to do a test as “it is what it is”, and what ever it is can be 100% mitigated with the Envirovent so you will see NO SMOKE with some adjustments..

 

But, if you are on a “mission”, it needs to be done under load and “PER THE BOOK” as to orifice size.

 

Tony

[Victor]

Mine do the same. Did you try the oil cap test?

[David Diener]

Engine has about 1100 hrs. Well,  it smokes pretty good out of the envirovent filter and oil fill cap when cap is off. I had to replace the turbo due to saltwater intrusion. Was flushing the engine the other day and my neighbor came over and said, “that engine seems to have a lot of blow by”. He saw the smoke coming out the envirovent filter. I don’t think I have an issue but figure it’s worth checking before I pull the engine out of the boat.

Thanks

[Tony Athens]

What do you suspect you need it?

What are the symptoms?

Total hours since new?

 

Tony

 

 

[Author]

Replies