Exhaust decisions / PowerFlow debate

By AlexLev
March 25, 2019 in Vintage Mooneys (pre-J models)

https://mooneyspace.com/topic/29490-exhaust-decisions-powerflow-debate/

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Posted April 2, 2019

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Posted April 2, 2019 (edited)

1 hour ago, AlexLev said:

Embarrassing update: wanted to re-torque the bolts after the A&P bolted on the exhaust (after flying it) and instead of using 150 in lbs, used 150 ft lbs and broke off on the left rear exhaust stack/riser. Hope someone learns from my mistake.

@Shadrach or @M20Doc: curious if you have any ideas for how to work that out without damaging the cylinder? I'll be working with an A&P as well, but wondering if any of you have any experience on working that remaining stud out. I feel really dumb

See pics:

It looks like there is enough of the stud remaining to extract it. Pull the exhaust riser and gasket to expose it. Ask your maintainer if he has a Snap On stud extractor like this one. It’s a collet style that you thread on to the stud, then tighten the collet to grip the stud. The stud will be a 5/16-18 NC thread.

Turn the engine over until the valve is closed, heat the inside of the port with a propane torch and turn the stud out.

Clarence

Edited April 2, 2019 by M20Doc

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Bob_Belville

March 27, 2019

FWIW, I was by @AGL Aviationtoday. Lynn had a PFS exhaust disassembled on a worktable. He pointed out a small crack inside the junction of the headers. The PFS is off a flying school's C172 and has 22

MARZ

April 1, 2019

removing that exhaust riser may give you enough of the broken stud to remove successfully. Luckily it wasn't the inboard stud. consider one of these - DO NOT give into the temptation to try a v

Hank

March 25, 2019

I was in your spot three or four years ago, muffler with a huge hole but risers were good. I have a new muffler and tail pipe, and it's not Power Flow. Good luck with yours! If you convert, pleas