Air Seps putting oil in Inner Coolers

[tomrealest]

Went to Ft Lauderdale Air Sep dealer & described problem. He asked how old are they were & I said 12 years. He said to replace them. I told him I don't have a tree that grew money. I didn't realize I looked that stupid! He then said to check the air sep valves which are ok.

Any ideas or help?

 

[Passages]

Don't replace sub par technology with newer sub par technology.

Oil is pulled over because A-S lacks a coelesor (sp?) in the return line. Look into Racors CCV system.

 

[jim rosenthal]

Agree. Racors are better. There is also a device called an EnviroVEnt, but I don't know if it comes with fittings for those engines.

 

[Nonchalant1]

AirSeps always pass some oil from the breather, so unless it is a lot of oil, maybe it's OK. Intercoolers can work fine with a light amount of oil normally there, as they are the first thing after the AirSeps and turbos. If it is a lot of oil, check your turbos for an oil leak, check the AirSep drain tubes and get new DD check valves for the line from the AirSeps to the crap can (don't run the drain to the crankcase). Also note that the AirSeps should be horiazontal so oil runs into the drain tubes.

 

[Genesis]

If your airbox drains are routed to the crankcase and not a crap can make sure the check valves are clear, oriented DOWN (not horizontally!) and close properly when the engine goes on-boost. If not you will pressurize the crankcase and blow a ridiculous amount of oil vapor into the Airsep intakes when on boost which will overwhelm the system and go straight into the coolers.

It is better to route the airbox drains to a separate crap can anyway, and it is important that those check valves are serviced when the oil is changed. Most people don't and on a large percentage of these engines one of the reasons why is that one or more of them are located in places that are nearly impossible to get to. The 6V92s are notorious for one of them being located behind the starter, for example.

If access or orientation is a problem on your engines re-routing these valves to a better location and orientation is usually fairly simple and inexpensive.

 

[Nonchalant1]

He has 6V92s? I thought they didn't have intercoolers, just an aftercooler. Yes, the AirSeps should be almost horizontal, and the checkvalves should be almost vertical.

 

[Genesis]

I'm simply pointing out that those valves need to be checked on any turbo engine as they are one of the easy-to-check-and-cheap-to-fix things that can cause excessive oil down the intake if you have airseps -- and they're often neglected.

Whether you have an aftercooler or intercooler it's after the turbo and it'll get oiled if you're pulling excessive vapor over due to crankcase pressure.

 

[captddis]

A lot of the time a droop in the hoses allows oil to be pulled over as well .