PA18-150 engine mount bushings

[Rusty Romito]

I am working on a 1954 PA18 with 0320 engine. Engine mount bushings need replacing so I ordered 71032 bushings, AN8-44 bots, AN310-8 nuts and STD619 washers. The existing bushings just have the washers on the bolt head side, and I was trying to find out if they were required on both sides.

 

[PerryB]

It has to have a big flat washer against the exposed bushing (forward). The rear bushing half is supported/covered by the engine mount flange and needs no washer. From your description, the bolts must've been installed front-to-rear ??

 

[Steve Pierce]

One side like this drawing. https://www.supercub.org/forum/showthread.php?29856-Conical-mounts-and-bolts

 

[Oliver]

I’m replacing engine mount bushings on a 200 hr install, rubber bushings are already badly distorted engine sagging.
Is there an alternative to OEM 71032’s that will hold up better?
thanks,
doug

 

[Steve Pierce]

How many years? Calendar time seems to be a factor as well as operating time. I have had the best luck with Lycoming factory rubbers.

 

[tempdoug]

are the silicone or urethane bushings any good?https://www.aircraftspruce.com/catalog/eppages/simpbush.php?clickkey=17335

 

[Oliver]

Steve, About 6 yrs on mounts.
Do you have a good source for genuine lyc mounts?

Temp, I have a set of the bushings you linked from a previous project, the necked down portion is way to long and not compatible for A2B case, not sure what they’re used on.

 

[Steve Pierce]

I have been getting them from Spruce.