The Cessna 120-140 Association Forum

I have a 1946 C120 serial number 9294.

It has an 0200 conversion, engine serial number 6425.R, which according to the continental website was shipped from them in 1973. The engine doesnt have Lord mounts, it has conical rubber mounts.

Were all 0200's shipped with Lord mounts or were some shipped with conical mounts?

To answer your double question - no and yes! If one checks the Continental parts manual it is detailed there. The aircraft OEM can specify to Continental what is preferred for their design. Not seen to often but IIRC the old Aeronca twin engine used your configuration and I think your part number can be traced to the aircraft that your engine came from. I did a field approval some years ago and researched this issue.

Edd

Thanks Edd.

It is a UK registered aircraft on the UK's 'permit to fly' scheme, all the aircraft ducuments came in a plastic bag and it is very difficult to tell what was done to it and why over the years.

The engine model is 0200A (42). Any idea what the (42) signifies? The parts manual for the 0200 doesnt explain what the last two numbers signify

8387 wrote: ↑Tue Apr 23, 2019 4:41 pmAny idea what the (42) signifies?

Section 6 page 3 (6-3) Unfortunately, it doesn't show a variation in the crankcase. Is your engine a Rolls Royce version? May be a different set of variations.

If you look in Section VI Customer Specifications of the parts manual, you will find that 0-200-A42 is the designator for the spec that the aircraft Manufacturer bought the engine - different mags harness etc. An 0-200 -B engine is for a pusher viz-a-viz a tractor engine.

Since your "R" is in the serial #, I guess that may be an indicator of a Rolls engine, as John C has brought up, or possibly a "reman" engine. We have an estate Ercoupe locally, that I was told by the deceased, that has an 0-200 conversion with the Rolls engine. I have "consulted" with the broker A&P on some AD issues and I will try to check the #s on that engine for comparison.

John C. - my older parts manual on Figure 3 Crankcase Associated Parts depicts both the Lord mount and the conical mount and list such in the part numbers listing.

Edd

Thanks all.

I'll investigate. Thanks for the info

Loosen one of the two rear cylinder hold down nuts on Cylinder 3. If the corresponding nut on the front of #2 doesn't get loose then you have a case manufactured before the introduction of the O200. All O200 cases and all replacement cases manufactured after the introduction of the O200 have through-bolts in those two positions. Cases manufactured prior to the development of the O200 had studs that did not go all the way through to the other side.

I'll do that, thanks.

When you're done, re-torque the nut to 490-510 in-lb. If the other side got loose, re-torque both sides.

I have an O-200A with a very similar s/n. I'm about 360 s/n's higher than yours.
The "R" at the end of your s/n should mean it went back through the factory for rebuild or overhaul. Nothing more or less.

You "should" have std 0-200 mounting ears for std 0-200 Lord Mounts. (not the very small conical mounts on the C-85's)

I will say I've never seen a true 0-200 with the small conical mounts, but anything is possible.?