Broken Exhaust Springs?
I have two broken exhaust springs and all I’ve done is ground run the engine for a few hours. I safety wired the springs which are carbon steel. I didn’t apply silicone. What am I doing wrong?
I have two broken exhaust springs and all I’ve done is ground run the engine for a few hours. I safety wired the springs which are carbon steel. I didn’t apply silicone. What am I doing wrong?
by David HEAL » 4 years ago
I run three beads of hi-temp silicone down the outside of each spring -- no spring breakage so far in 900+ hours. The safety wire is really only there to keep broken spring pieces from going through the pusher prop or somebody's head.
by Bill Hertzel » 4 years ago
The silicon on the springs helps keep the springs from vibrating themselves to death.
Did they break in the hook ends or mid-Coil?
Are they still looking shiney and new or badly corroded?
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
by geoffrey klestadt » 4 years ago
Broken at the ends, light surface rust. I think my home made installation tool may have nicked the spring end during installation because I can see a microscopic fatigue crack signature on the broken bit.
I bought some stainless springs from Rotax, so I’ll fit them with a new tool and apply silicon as well as safety wire.
by Jon Tensfeldt » 4 years ago
The Vans MM also recommends pulling the springs with a safety wire loop so as not to scratch springs ends.
by Bill Hertzel » 4 years ago
You can always pull the Springs with an actual SPRING PULLER. Imagine that!
They actually make a tool for Pulling springs and it is under $10. Under $5 if you look.
And easy enough to make with an old fashioned Coat-Hanger, Which might be even harder to find.
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
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