Constant Speed / Fixed Pitch

[s24789]

I purchased a YO-360-A1A engine and was told that I should get it manufactured with as a constant speed capable engine although we will keep it as a fixed pitch prop on our 7A. I spoke with Lycoming and they highly recommended that I remove and cap the line from the back of the case to the front and to punch a hole in the aft "cap". I am concerned that I will do damage. Any one else have information on this issue ?
Thanks in advance
Kevin

[Sam Buchanan]

Originally Posted by s24789

I purchased a YO-360-A1A engine and was told that I should get it manufactured with as a constant speed capable engine although we will keep it as a fixed pitch prop on our 7A. I spoke with Lycoming and they highly recommended that I remove and cap the line from the back of the case to the front and to punch a hole in the aft "cap". I am concerned that I will do damage. Any one else have information on this issue ?
Thanks in advance
Kevin

Kevin, this is a very easy procedure for someone familiar with Lycomings. Just have the engine built constant speed capable but ready for fixed pitch and you will be good to go. However, if the engine is delivered to you CS-ready, an A&P can quickly mod the aft crank plug for you.

Be sure you receive and save the governor line for later use. It is high-$$$$$$!

[osxuser]

Assuming the line is stainless, not the older aluminum one. Make sure you get someone familiar enough with Lycs to work on it. Half the A&P's I know wouldn't know where to start.

[s24789]

Originally Posted by Sam Buchanan

Kevin, this is a very easy procedure for someone familiar with Lycomings. Just have the engine built constant speed capable but ready for fixed pitch and you will be good to go. However, if the engine is delivered to you CS-ready, an A&P can quickly mod the aft crank plug for you.

Be sure you receive and save the governor line for later use. It is high-$$$$$$!

Thanks Sam. Aside from the obvious, "I can get a leak in the line", am I damaging or doing something stupid by leaving it as is ??

[jsharkey]

http://www.vansairforce.com/communit...ad.php?t=42685

The significance of puncturing or removing the rear plug for a FP installation is to allow oil pressure on the front bearing to easily vent to the crank case and prevent the possibility of "blowing" the front plug and losing oil. This oil pressure is otherwise used to actuate the CS via the prop governor.

Installations with a CS oil line in place and a governor blanking plate with a bypass channel will allow oil pressure from the front bearing to vent to the crank case via the oil line.

However Lycoming still recommend removing or puncturing the rear plug to enable better oil flow and circulation thus preventing the build up of sludge and moisture and therefore crank corrosion.

Jim Sharkey
RV-6

[s24789]

Thanks Jim we have decided to remove the line and cap the holes, remove the front and rear plugs and and put a new front plug in. Is there anything I need to do on the governor pad at the back of the engine ?
phelps

[turbo]

seeing at your hanger today. we need a few more rvs at sua. you guys can come up with me any time to get some time. ill be in ct for most of the summer though. turbo

[jsharkey]

Originally Posted by s24789

Thanks Jim we have decided to remove the line and cap the holes, remove the front and rear plugs and and put a new front plug in. Is there anything I need to do on the governor pad at the back of the engine ?
phelps

Plugging the lines and leaving the governor pad blanking plate in place should be fine but there is no reason why you shouldn't leave the line too, other than to save weight. Either way you should pierce or remove the rear plug.

Jim Sharkey