rotax 912 exhaust springs

[hihosland]

What is the expected life of the springs that secure the components in a Rotax 912?

 

And what will have an effect on that life?

 

many thanks for thoughts

 

Davidh

 

 

[Guest pelorus32]

G'day,

 

all I know on the subject is that I found and we replaced a broken spring during a preflight the other day. If I recall correctly the spring had done 400 hours.

 

It broke where the "apex" of the hook on one end had worn on the anchor point on the exhaust pipe.

 

I understand that filling them with silicone helps extend their life as it stops them vibrating.

 

Regards

 

Mike

 

 

[Guest micgrace]

Hi

 

filling the springs (along the side in a couple of "strips" ) with silicone is a common practice used on Rotax 2 strokes where vibration is very high at idle and off. I suppose it's valid for a 912 although I can't recall any recommendation for such apart from safetying.

 

Micgrace

 

 

[hihosland]

Mine broke at 225 hours in two years. It broke where the "hook" joined the actual coiled spring part. No silicone filling.

 

Davidh