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Old 01-21-2021, 01:52 PM
iamtheari iamtheari is offline
Join Date: Nov 2017
Location: ND
Posts: 506
Default Removing Intake Tube on IO-390

I'm probably not the first person to run into this snag. I have the IO-390 engine (the old 210 hp recommended model) on my RV-14. I want to install the sump return fitting for my air-oil separator. I didn't notice until today that the #1 intake tube is going to interfere with installing the 90-degree return fitting for the separator, at least in the forward right sump plug where I believe it needs to go.

Of course, I installed the exhaust system just a week ago and then noticed the problem now.

Does anyone know if the #1 intake tube can be removed with the exhaust headers in place, or do I need to pull the exhaust system first?
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Old 01-21-2021, 02:01 PM
DanH's Avatar
DanH DanH is offline
Join Date: Oct 2005
Location: 08A
Posts: 9,871

Return it to #13.

Dan Horton
Barrett IO-390
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Old 01-21-2021, 02:30 PM
iamtheari iamtheari is offline
Join Date: Nov 2017
Location: ND
Posts: 506

Thank you! I'll have to get a new fitting since I have the kind with the extended tube, but I think your suggested location makes even more sense for getting the oil back into the sump.
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Old 01-21-2021, 03:42 PM
KHeidorn KHeidorn is offline
Join Date: Nov 2013
Location: Heber City, UT
Posts: 119

You will not be able to remove the intake tube without first removing the exhaust.
Ken Heidorn,

"You're never too old to learn something stupid." - unknown
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Old 02-01-2021, 08:46 PM
iamtheari iamtheari is offline
Join Date: Nov 2017
Location: ND
Posts: 506

After staring at the engine from many angles on several occasions, I decided to stick with the original location for the oil return fitting. The reason is that the fitting on the accessory housing pictured above in this thread is in a tight spot and appears to be a different size, so there would be cascading changes to my plan for the oil separator installation.

I removed the exhaust headers from cylinders 3 and 4 to allow that part of the exhaust system to drop down a few inches, then removed the intake pipe from cylinder 1 and installed the return fitting. It went smoothly for now, as long as nothing decides to leak on me later.

The only real hassle is that I need to get some more MS35333-41 washers since there seem to only be 8 in the RV-14 kit and I know you're not supposed to re-use those.

Onward and upward!
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