m38a1/m170 exhaust

bl5211a · Member Joined: Dec 28, 2006 Posts: 344 Location: NC

Getting ready to assemble exhaust system, do folks recommend using high temp sealant on pipe flange gaskets?
_________________
Brian
1955 M170
1940 BSA M20

MODIFIED · Member Joined: Mar 28, 2008 Posts: 353 Location: BrOoKlYn

I opted to make my own copper flange gaskets for exhaust joints. After annealing to precipitate ductility, then spray a few coats of ultra copper sealant that acts as an added conformal layer.

I've had little success with other forms of RTV or sealants when mating high temp flanged surfaces along the exhaust system to the stock gaskets.

Initially, a properly prepared mating surface despite what you choose; either dry or with sealant, insures a good long lasting seal upon any connection, meaning that the contact surfaces both join flat and clean.
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Always Looking for M170 Parts and bits Wink

OKCM38CDN · Posted: Fri Jul 11, 2014 7:15 pm Post subject:

On my M-38 CDN which is very similar to the M-38A1 the only thing I did was make sure I used brass nuts on the bolts on the exhaust pipes themselves per the SNL... I have been running my M-38 for almost 10 yrs with out a problem in the exhaust system.

As long as you are using the military triangular fittings and gaskets all should be well...

Hope this helps...
_________________
Hal, KB1ZQ
TSGT, USAF (Ret)
1952 M-38 CDN CAR 52-31313
1952 M-100 Strick #104
1951 Willys Wagon (For Sale)
1954 Willys M38A1 201001205
Tornado Alley
Del City, OK

bl5211a · Member Joined: Dec 28, 2006 Posts: 344 Location: NC

Did u use brass nuts on muffler to pipe flange and pipe to pipe flange ?
_________________
Brian
1955 M170
1940 BSA M20

OKCM38CDN · Posted: Sat Jul 12, 2014 5:54 am Post subject:

All nuts were brass, on the exhaust manifold to block (Special Castle / Lock nuts) then all the bolts from that point on had the standard gasket (triangular in shape) and 3 bolts / Brass nuts per connection...

Hope this helps...
_________________
Hal, KB1ZQ
TSGT, USAF (Ret)
1952 M-38 CDN CAR 52-31313
1952 M-100 Strick #104
1951 Willys Wagon (For Sale)
1954 Willys M38A1 201001205
Tornado Alley
Del City, OK

billybob · Posted: Sat Jul 12, 2014 6:12 am Post subject: exhaust

Where did you find the brass lock nuts? Thanks.

bl5211a · Member Joined: Dec 28, 2006 Posts: 344 Location: NC

I have not been able to find the smaller ones in brass , but did find the 3/8-24.

Does anyone have the 5/16 brass nuts?
_________________
Brian
1955 M170
1940 BSA M20

wesk · Posted: Sat Jul 12, 2014 8:49 am Post subject:

The only time any added sealants are used on exhaust system port gaskets is when the assembler doesn't want to machine irregularities out so they fit together properly. It is a poor or lazy man's band aid.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

OKCM38CDN · Posted: Sat Jul 12, 2014 12:36 pm Post subject:

The 3/8-24 Lock nuts for the manifold are available from most of the military vehicle suppliers (I just bought some from Mullins)

I found the standard 5/6-18 at ACE hardware... My local store has closed so I will need to see if the new one stocks them...

Hope this helps...
_________________
Hal, KB1ZQ
TSGT, USAF (Ret)
1952 M-38 CDN CAR 52-31313
1952 M-100 Strick #104
1951 Willys Wagon (For Sale)
1954 Willys M38A1 201001205
Tornado Alley
Del City, OK

billybob · Posted: Sat Jul 12, 2014 1:01 pm Post subject: exhaust

Thanks, My Ace store also closed several years ago. I sure miss it. I read somewhere that they may not have a MVPA jeep reunion in Jeff City this fall. I hope they do.


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