C90, O200 oil sump on C85? Help!

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C90, O200 oil sump on C85? Help!

Postby AmazonJet » Wed Jul 07, 2010 4:28 am

We all know that the C85 oil sump has a tendancy to crack where the round flange is welded to the tank. I can't find a good one to even repair for my plane. On the C90 and O200 the tank capacity is a half a quart and 1.5 quarts greater and they both have supports welded on them around the flange to help prevent cracking.

The parts book shows that all the engines use the same oil suction tube and case-to-oil sump gasket.

Will a C85 or O200 oil sump just simply bolt onto a C85?

Is the support tab on the oil dipstick tube even still in the right positon to attach to the case?

I know this would not be FAA legal but will it work?
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Postby John C » Wed Jul 07, 2010 10:04 am

All O-200's have a 6 quart capacity tank. Some C-90's did also, but most had the 5 quart tank. The actual marked capacity and the configuration of the fill neck and dip stick are airframe specific.

That said, all tanks will fit all engine cases, but you may find the wrong ones interfere with engine mounts, cowls, exhaust, etc. For example, Ercoupe tanks have the oil fill neck on the left.

That said, the C120/140 setup is not real particular about tank configuration and many different tanks will fit just fine.
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Postby Jeff Tourt » Wed Jul 07, 2010 10:46 am

Our sump on the C-90 is the 5qrt and the dip stick says 4.8. Has had the crack repaired are you sure yours can't be repaired? I'm told O-200 tank will not be legal even if it bolts up.
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Postby Tye Hammerle » Wed Jul 07, 2010 2:37 pm

What's stopping someone from getting a field approval to put an O-200 sump on a C-85? Seems to me success depends largely on the particular FSDO and the applicants ability to articulate the proposal.
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Postby hngrflyr » Thu Jul 08, 2010 2:50 am

I overhauled this engine for a friend's Luscombe. It is a C-85, and has a O-200 oil sump. He has the 337 for it. The sump had been installed before he purchased the airplane.
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Postby AmazonJet » Thu Jul 08, 2010 4:01 am

I just looked at a c150 with an 0-200 in it and the 6 quart oil sump looks like it would fit on my engine and airplane with no problem.

Okay, does anyone have an 0-200 oil sump they would part with?
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