Looking for a reference for 2-piece cam parts

[IowaRV9Dreamer]

I moved this from my accessory case thread...

I am preparing to build an O-320-E2A. It is an older engine I bought as parts. It came with a 2 piece camshaft, which I will probably use unless someone gives me a reason not to.

The cam has been ground/resurfaced by Aircraft Specialties Services (yellow tagged). The gear has been yellow tagged also by Central Cylinder Services.




My parts catalogs (both the current one, and a 1984 version that I have) only show the 1 piece cam. I found this picture in the Overhaul Manual:


I have the gear, slinger, and 2 lockplates. I will need to source the other parts.

Does anyone have an old (pre 1982, I think) Parts Catalog for the O-320 that would list the part numbers for all of these parts?

[az_gila]

An old O-360 parts manual -



Here is my camshaft assy. before it went to the assembler. You can see the two bolt retainer plates and the formed sheet metal "SLINGER, Breather" under the bolt heads.

[IowaRV9Dreamer]

Gil, thanks SO much!

Is the rod in the center the "Tachometer shaft"? I think it would be OK to omit those parts (tachometer shaft, tach shaft spacer), what do you think?

My lockplates are probably OK but I'd like to get new ones. I"m not sure if they should be reused.

Want to come to NM and build an engine

[jrs14855]

I'm pretty sure you need to install the tach drive shaft. The covers for the tach drive(Spruce etc.) are just dust covers and would not create an adequate oil seal.
The locking plates should not be reused.
The cam gear bolts have probably been superceded. Dart Aircraft in Waco TX might help with superceded parts. They have Lycoming ECI and Superior.

[az_gila]

Originally Posted by jrs14855

I'm pretty sure you need to install the tach drive shaft. The covers for the tach drive(Spruce etc.) are just dust covers and would not create an adequate oil seal.
The locking plates should not be reused.
The cam gear bolts have probably been superceded. Dart Aircraft in Waco TX might help with superceded parts. They have Lycoming ECI and Superior.

I think the bolts are still around, however a good description of them is here -

http://www.aircraft-specialties.com/...g-sl-std-1791/

The lockplates are also easy to get -

http://www.aircraft-specialties.com/...33-sp-sl72078/

[IowaRV9Dreamer]

Originally Posted by az_gila

An old O-360 parts manual -

Hi Gil - can you post the picture that goes along with these parts? It looks like I need Item 23 (STD-1199, "Pin - 3/16 x 1-1/8") as well. The figure would sure help.

[az_gila]

Originally Posted by IowaRV9Dreamer

Hi Gil - can you post the picture that goes along with these parts? It looks like I need Item 23 (STD-1199, "Pin - 3/16 x 1-1/8") as well. The figure would sure help.

Not one of Lycoming finest - the viewpoint is poor -

[az_gila]

Because part #23 goes cross-wise to the camshaft, I think it is the early equivalent of the pin that retains the tach drive in the later one piece camshafts. Same diameter, but now 2 21/64 inches long.

A stolen picture -

[IowaRV9Dreamer]

Thanks Gil - both pictures help a lot.

You are right, the Lyc drawing doesn't show this clearly... but I find those old hand drawn pictures strangely beautiful. Much nicer than modern CAD stuff.

You stolen photo is really good to show the tach shaft on a modern camshaft. It shows that the tach shaft (and its crosswise pin) is installed on the outside of the camshaft gear. Looks like it is held in with a snap ring.

Your stolen picture inspired me, so I stole this one: I think it is similar to what I will have:


This shows a 2 piece cam - the shaft/pin is installed between the cam and gear. I think it still floats around a bit but can't be removed without taking the gear off.

I'll find a servicable tach shaft - the pins are still available. This is a bit annoying because the tach function will never be used.

Thanks again for the pictures,

dave

[IowaRV9Dreamer]

Good news - I found what appears to be the tach shaft and centering spacer:


It needs a cleaning and inspection but initially appears serviceable.

I still need the cross pin but that is available. Thanks Gil!