Conversion from CS to Fixed Pitch Prop

[RogerM]

I have a YIO-360 Lycoming engine purchased thru Van's that comes set up for a constant speed prop. My plan is to convert this engine to run a fixed pitch Catto prop. This requires compliance with Lycoming Service Instruction 1435. To complete this modification I must removal of the front expansion plug in the crankshaft, put a 1/8 to 3/16 hole in the aft crankshat expasion plug, avoid damaging the tranfer tube forward of the aft plug, and reinstall the forward expansion plug in the crankshaft.

I need a detailed set of instructions on how to accomplish this conversion without doing some serious damage to the crankshaft. Some of you very talented guys have undoubltedly done this and I'd appreciate your sharing your knowledge.

All of the arguments, pro and con, for the fixed vs cs have been extensively reviewed and argued with my professional flying buddies and that is no longer a topic for discussion.

[Jeff R]

Don't you also have to remove and plug the oil return tube?

[N941WR]

Originally Posted by RogerM

... and reinstall the forward expansion plug in the crankshaft...

There will be no "reinstall" of the old plug. You will damage it when you remove it. "Replace" is a better word.

[RV8R999]

Im doing the same thing mostly cause FP is WAYYYYY better than C/S! hahah I cant wait for the fun now!

in any event. anyone have a source and P/N for the crankshaft plug?

[RogerM]

Originally Posted by RV8R999

Im doing the same thing mostly cause FP is WAYYYYY better than C/S! hahah I cant wait for the fun now!

in any event. anyone have a source and P/N for the crankshaft plug?

Van's has them in their inventory. I bought one to do the reinstallation of the forward plug and it was only a few dollars.

[RogerM]

Originally Posted by Jeff R

Don't you also have to remove and plug the oil return tube?

You can remove the oil line and the base housing for the prop controller and replace them with a plug and plate saving a few pounds of weight, but Tech Support at Lycoming told me that it's not necessary to remove it if willing to live with the weight. I have the part numbers for this fix, but decided not to do it.

[RogerM]

Originally Posted by N941WR

There will be no "reinstall" of the old plug. You will damage it when you remove it. "Replace" is a better word.

I was hoping to receive some helpful information to assist with completion of my project, and if you happen to have any I'd appreciate receiving it.

[RV8R999]

I removed the gov adaptor, the line, and plugged at the crankshaft end. More than weight savings I like having the extra room to behind the engine to get to all the oil, fuel pump fittings..sure makes things easier back there.

Just bought a couple of plugs at spruce. Not sure about punching that hole in the after crank plug though...drilling is out cause where are all those metal chips going?

[MattSR]

Originally Posted by RV8R999

Icause FP is WAYYYYY better than C/S! hahah

Ohhh! Them's fightin' words!

[agough277]

I've used Van's Sencenich prop on two 7's and it works great. Why Catto? Sencenich will be around in 10 years for service.