Exhaust System Nuts & Bolts

N1478D · Post by **N1478D** » Wed Jan 08, 2003 2:09 pm

I tried posting this under an older topic, but it was ignored!

For the Hanlon-Wilson mufflers, what type of hardware(nuts/bolts) -is it stainless steel? One of them was fairly welded on, so would like to replace all hardware on that side. The nuts/bolts that hold the clamps.

Thanks in Advance! It is tore down, and as soon as I find out the answer to this question, things can start going back together.

N170BP · Post by **N170BP** » Wed Jan 08, 2003 4:04 pm

Joe,

When I replaced the offending clamps, I just used the
original hardware (it was in good shape).

That being said, my parts manual says the bolt
is an AN4-4A and the nut is an AN365-428C.

Bela P. Havasreti
'54 C-170B N170BP

N1478D · Post by **N1478D** » Wed Jan 08, 2003 5:29 pm

Thanks Bela,

I have 3 versions of Parts Catalogs for my A model, and this is another time when it is a struggle to find the information. I have an original Cessan Model 170A Parts Catalog, a Cessna Model 170 Series Catalog for the 170/170A, and a Univair Cessna 170A Parts Catalog. The Continental Aircraft Engine Illustrated Parts List for C-125, C-145 & 0-300 Aircraft Engines does have an illustration of the intake assembly that shows the clamp and hose info. But I cannot find an illustration of the clamps/hardware for the mufflers. The 170 book does not have it and the Cessna 100 Series Service Manual (1962 & Prior) does not have it. At least, I have not been able to find it.

zero.one.victor · Post by **zero.one.victor** » Wed Jan 08, 2003 5:33 pm

Joe,maybe somebody can make a copy of the exhaust pages of the B model IPC. I think all the A's,along with the earlier ragwings,came from the factory with the "pancake" style exhaust. Lots of them have been converted to the H-W system,though.

Eric

N1478D · Post by **N1478D** » Wed Jan 08, 2003 5:37 pm

zero.one.victor wrote:Joe,maybe somebody can make a copy of the exhaust pages of the B model IPC. I think all the A's,along with the earlier ragwings,came from the factory with the "pancake" style exhaust. Lots of them have been converted to the H-W system,though.

Eric

Well Eric, I had a better chance of that before you reminded George of his paradigms!

There is no telling what I am liable to get a copy of now, but one thing for sure is - it will be long, and I will be scolded!

ak2711c · Post by **ak2711c** » Thu Jan 09, 2003 7:28 am

Joe, standard AN bolts are fine to use however I would not recomend using the AN365 lock nut. That lock nut has a nylon insert in the end that doesn't hold up well to the heat. What you want is an all steel lock nut, I believe if my memory serves me right that it is a AN363. Some antiseize on the threads will save you some headach next time you go to change the too. Good luck!
Shawn

N1478D · Post by **N1478D** » Thu Jan 09, 2003 2:07 pm

ak2711c wrote:Joe, standard AN bolts are fine to use however I would not recomend using the AN365 lock nut. That lock nut has a nylon insert in the end that doesn't hold up well to the heat. What you want is an all steel lock nut, I believe if my memory serves me right that it is a AN363. Some antiseize on the threads will save you some headach next time you go to change the too. Good luck!
Shawn

Thanks Shawn, had not thought about the aniseize either, that's a lot of help.

N1478D · Post by **N1478D** » Thu Jan 09, 2003 9:12 pm

Did a better search and found a George post where he used stainless nuts and bolts for his hardware!

Post by **GAHorn** » Fri Jan 10, 2003 3:46 pm

N170BP wrote:Joe,

When I replaced the offending clamps, I just used the
original hardware (it was in good shape).

That being said, my parts manual says the bolt
is an AN4-4A and the nut is an AN365-428C.

Bela P. Havasreti
'54 C-170B N170BP

A "C" after a part number indicates stainless.

N170BP · Post by **N170BP** » Fri Jan 10, 2003 4:06 pm

ak2711c wrote:Joe, standard AN bolts are fine to use however I would not recomend using the AN365 lock nut. That lock nut has a nylon insert in the end that doesn't hold up well to the heat. What you want is an all steel lock nut, I believe if my memory serves me right that it is a AN363. Some antiseize on the threads will save you some headach next time you go to change the too. Good luck!
Shawn

Thanks for catching that Shawn (I should know better.... no
nylocks forward of the firewall....).

Bela P. Havasreti
'54 C-170B N170BP

N1478D · Post by **N1478D** » Wed Feb 05, 2003 7:41 pm

What is the torque value for the brass exhaust nuts? And, where is that info found? On page 1-8 of the 100 - Series SERVICE MANUAL 1962 AND PRIOR, there are torque values for different size nuts, but wondering if the brass exhaust nuts would have a different value.

Post by **GAHorn** » Sun Feb 09, 2003 6:57 am

N170BP wrote:
ak2711c wrote:Joe, standard AN bolts are fine to use however I would not recomend using the AN365 lock nut. That lock nut has a nylon insert in the end that doesn't hold up well to the heat. What you want is an all steel lock nut, I believe if my memory serves me right that it is a AN363. Some antiseize on the threads will save you some headach next time you go to change the too. Good luck!
Shawn
Thanks for catching that Shawn (I should know better.... no
nylocks forward of the firewall....).

Bela P. Havasreti
'54 C-170B N170BP

Not true, Bela. If one looks at the parts catalog, one will see that "nylock" nuts are used to attach the generator.

N170BP · Post by **N170BP** » Sun Feb 09, 2003 7:56 pm

Thanks George.

I was thinking more along the lines of a general
rule rather than verbatim out of the parts manual.

Bela P. Havasreti
'54 C-170B N170BP