heat muff question

[Chappyd]

I installed the heat muff on the #1 exhaust tube per my plans. I have the complete FWF kit from Van's, with an IO-360-M1B. Everything went toghether well, but the entire unit can rotate on the exhaust pipe and also slide back and forth about an inch. Is this normal? I tightened the hose clamps up pretty tight, but it didn't help any. It seems that the way it is now there's nothing to secure it in place. Am I missing something?

[chris mitchell]

If I remember this step correctly from about about 18 months ago, the problem was that the hose clamps cannot tighten the muff securely enough. Solution is to file the little holes in the end plates that the long threaded piano wires (that locate the end plate assemblies) pass through, so that they are slightly oval. Then when you tighten the clamps, the end plate assemblies slide together and can tighten up sufficiently to locate the muff firmly on the exhaust pipe. It should NOT be able to slide the muff up and down or rotate it.

Sorry, no pictures, but I hope this somewhat shambolic explanation is enough to let you solve the problem!

Chris

[AltonD]

Dave, I have the same engine. Can you send me a pic of the installed heat muff? I can't seem to get the idea of how they want me to install the muff.

[Chappyd]

Chris, that make sense. Should work great

Alton, I came across these pics, and it is just how I did mine. Van's plans don't show the heat muff for the 180 hp I guess. Robbinswings makes the muffs for Vetterman.

http://www.robbinswings.com/Custom.htm

[AltonD]

Originally Posted by Chappyd

Van's plans don't show the heat muff for the 180 hp I guess. Robbinswings makes the muffs for Vetterman.

Thanks! Your right, no drawings for that heat muff.