Exhaust manifold torque

[Mike Davis]

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I am now mounting the engine on my Rebel hopefully for the
last time prior to its first flight. Can someone tell me
what torque the manifold nuts need to be tightened to? I
have the metallic gaskets and brass coloured nuts. There are
no washers of any kind. Are any needed? The engine is a
Lycoming 0320 A1A. The exhaust system is from Murphy and is
the cross over type. Also, is any kind of brace needed near
the ends of the pipes for support? Thanks for your help.

[Mike Davis]

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Hi Walter,
Curt Martin #426 (N97MR) . In answer to your torque question, it is the
standard torue for 1/4-20 bolts, whch is 100in. lbs. (I think) I don't have
the book in front of me so I'm going from memory. Our Rebel now has 15 hrs.
on
it, and although we had some problems with our exhaust there does not
appear
to be any reason for support. you do not need the washers either. What we
found on inspection was a crack in the exhaust pipe just at the connection
of
the crossover and the down stack in front of the heater muff on the copilots
side. I guess youn could say at the wye. During this inspection we also
found
that the exhaust had been hitting the bottom flange of the firewall, just
enough to leave a small mark on the exhaust stack and the firewall. We are
supposing that the vibration and striking may have caused the problem, but
you
can be sure that we are keeping a real close eye on the rest of the system
as
this occured in the first three hours. We have welded the pipe and relieved
the area of striking with no additional problems. What keyed us to the crack
was an area of scaling when the rest of the system was clean. Keep at it,
they fly like a dream!!!
Curt Rebflyer @aol.com

[Mike Davis]

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Curt, thanks for the information, and congratulations on your completion.
Sounds
like it was very successful.

Forgot to ask another question in my first note. Do the joints in the
cross-over
pipes need to be clamped? If so what type of clamp? Again, thanks for your
help.

Rebflyer@aol.com wrote:

Hi Walter,
Curt Martin #426 (N97MR) . In answer to your torque question, it is the
standard torue for 1/4-20 bolts, whch is 100in. lbs. (I think) I don't

have

the book in front of me so I'm going from memory. Our Rebel now has 15

hrs. on

it, and although we had some problems with our exhaust there does not

appear

to be any reason for support. you do not need the washers either. What we
found on inspection was a crack in the exhaust pipe just at the connection

of

the crossover and the down stack in front of the heater muff on the

copilots

side. I guess youn could say at the wye. During this inspection we also

found

that the exhaust had been hitting the bottom flange of the firewall, just
enough to leave a small mark on the exhaust stack and the firewall. We

are

supposing that the vibration and striking may have caused the problem, but

you

can be sure that we are keeping a real close eye on the rest of the system

as

this occured in the first three hours. We have welded the pipe and

relieved

the area of striking with no additional problems. What keyed us to the

crack

was an area of scaling when the rest of the system was clean. Keep at it,
they fly like a dream!!!
Curt Rebflyer @aol.com

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[Mike Davis]

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Hi Walt,
No, they need to slip for expansion, so leave them loose.
Curt



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[Mike Davis]

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Date: Mon, 23 Feb 1998 07:55:26 -0800
Subject: Re: Exhaust manifold torque
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From: rbartman@juno.com (Richard H Bartman)


On Sat, 21 Feb 1998 11:08:32 -0800 Walter Klatt <wklatt@interserv.com>
writes:

I am now mounting the engine on my Rebel hopefully for the
last time prior to its first flight. Can someone tell me
what torque the manifold nuts need to be tightened to? I
have the metallic gaskets and brass coloured nuts. There are
no washers of any kind. Are any needed? The engine is a
Lycoming 0320 A1A. The exhaust system is from Murphy and is
the cross over type. Also, is any kind of brace needed near
the ends of the pipes for support? Thanks for your help.

warning!!!!

I too bought an exhaust system from murphy. mine did not come with any
instructions. i welded the joint at the crossover and did not have any
support at the outlets. after 15 hours the exhaust separated just past
the heat muff. hot gases boiled the fuel in the carb, all this on take
off.

i returned the system to the company that manufactures it for murphy and
was told i was an idiot(implied) for not reading the instructions(which
i never received).
murphy gave me a deal and replaced the system with a new one which came
with 6 page instructions. do not weld or clamp the slip joint. you must
support the tail end of the system.

i proceeded to wrap the new system with thermo wrap bought from aircraft
spruce. it worked fine in keeping the heat out of the cowel but in 30
hours it had completely destroyed the metal the pipes are made of.

education is expensive!

my porsche engine is now completely installed. by the sound of it those
are 150 tough horses waiting to go flying. hopefully by the end of feb.
if this rain will stop.

brain: if you are reading this it appears that i was not the only one who
did not receive instructions with my factory exhaust system( or are we
all idiots?).

rich bartman

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[Mike Davis]

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Rich

What was the failure mode of the exhaust wrapped with insulating
material? Corrosion? overheating?

I think it would be informative to hear your description on this as
insulating the system would seem to make sense (and indeed is used in
some automobile racing applications).

Thanks

Dave R.



Richard H Bartman wrote:

On Sat, 21 Feb 1998 11:08:32 -0800 Walter Klatt <wklatt@interserv.com>
writes:

I am now mounting the engine on my Rebel hopefully for the
last time prior to its first flight. Can someone tell me
what torque the manifold nuts need to be tightened to? I
have the metallic gaskets and brass coloured nuts. There are
no washers of any kind. Are any needed? The engine is a
Lycoming 0320 A1A. The exhaust system is from Murphy and is
the cross over type. Also, is any kind of brace needed near
the ends of the pipes for support? Thanks for your help.

warning!!!!

I too bought an exhaust system from murphy. mine did not come with any
instructions. i welded the joint at the crossover and did not have any
support at the outlets. after 15 hours the exhaust separated just past
the heat muff. hot gases boiled the fuel in the carb, all this on take
off.

i returned the system to the company that manufactures it for murphy and
was told i was an idiot(implied) for not reading the instructions(which
i never received).
murphy gave me a deal and replaced the system with a new one which came
with 6 page instructions. do not weld or clamp the slip joint. you must
support the tail end of the system.

i proceeded to wrap the new system with thermo wrap bought from aircraft
spruce. it worked fine in keeping the heat out of the cowel but in 30
hours it had completely destroyed the metal the pipes are made of.

education is expensive!

my porsche engine is now completely installed. by the sound of it those
are 150 tough horses waiting to go flying. hopefully by the end of feb.
if this rain will stop.

brain: if you are reading this it appears that i was not the only one who
did not receive instructions with my factory exhaust system( or are we
all idiots?).

rich bartman

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[Mike Davis]

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Richard, thanks for the information, and sorry you had to learn the hard
way.
I, too, did not receive any instructions which is why I was asking these
questions. I will have to get back to MAM to see what they have now. How are
the tail pipes to be supported, or is that in the instructions?

Richard H Bartman wrote:

On Sat, 21 Feb 1998 11:08:32 -0800 Walter Klatt <wklatt@interserv.com>
writes:

I am now mounting the engine on my Rebel hopefully for the
last time prior to its first flight. Can someone tell me
what torque the manifold nuts need to be tightened to? I
have the metallic gaskets and brass coloured nuts. There are
no washers of any kind. Are any needed? The engine is a
Lycoming 0320 A1A. The exhaust system is from Murphy and is
the cross over type. Also, is any kind of brace needed near
the ends of the pipes for support? Thanks for your help.

warning!!!!

I too bought an exhaust system from murphy. mine did not come with any
instructions. i welded the joint at the crossover and did not have any
support at the outlets. after 15 hours the exhaust separated just past
the heat muff. hot gases boiled the fuel in the carb, all this on take
off.

i returned the system to the company that manufactures it for murphy and
was told i was an idiot(implied) for not reading the instructions(which
i never received).
murphy gave me a deal and replaced the system with a new one which came
with 6 page instructions. do not weld or clamp the slip joint. you must
support the tail end of the system.

i proceeded to wrap the new system with thermo wrap bought from aircraft
spruce. it worked fine in keeping the heat out of the cowel but in 30
hours it had completely destroyed the metal the pipes are made of.

education is expensive!

my porsche engine is now completely installed. by the sound of it those
are 150 tough horses waiting to go flying. hopefully by the end of feb.
if this rain will stop.

brain: if you are reading this it appears that i was not the only one who
did not receive instructions with my factory exhaust system( or are we
all idiots?).

rich bartman

_____________________________________________________________________
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Get completely free e-mail from Juno at http://www.juno.com
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