M170/ m38a1 Exhaust

bl5211a · Post by **bl5211a** » Sat Jul 12, 2014 5:27 pm

Hello : Could some one post or send me a couple pics of how the pipe comes out under the right rear of the M170 jeep. is it typical for the lifting hook to sit on flange of pipe?

Brian

Post by **wesk** » Sat Jul 12, 2014 6:27 pm

They are close but they should not touch each other. You'll have to heat and bend a bit of the piping to get her to exit the rear in the right spot.

You need to go to our downloads page and download Change 1 to the TM 9-8015-2.

Pages 1-20
http://willysmjeeps.com/downloads/TM%20 ... gs1-20.pdf

Pages 21-41
http://willysmjeeps.com/downloads/TM%20 ... s21-41.pdf

Pages 3, 11, 14, 18, and 20 have very good illustrations of the exhaust system.

G740 · Post by **G740** » Sun Jul 13, 2014 5:04 am

On the M170, the tailpipe extension will be in the way of the lift ring. It is not a matter of bending, heating, or beating. The pipe and the shackle have interference.
John

Post by **wesk** » Sun Jul 13, 2014 7:15 am

I disagree John. We have had several members successfully bend the interference out by working the angles forward of the muffler. It's today's inaccurate repop pipes that cause the interference issue.

In Dave's photo below you can see the flange in it's proper position inboard of the shackle ring.

G740 · Post by **G740** » Mon Jul 14, 2014 5:17 am

Wes,
If you will note in the photo, the ring is resting against the pipe. Granted, Dave has the ring on the inside of the pipe, but it is still resting against the pipe.
John

Post by **wesk** » Mon Jul 14, 2014 8:14 am

John, if you will notice the ring is resting against the fording pipe not the tailpipe!

bl5211a · Post by **bl5211a** » Sat Jul 19, 2014 7:07 pm

Hello: Mine looks just like the photo but with lifting hook resting on flange instead of forward of flange. Its a m170 with all NOS pipes/ hangers..

I also found photos of the old system before disassembling and hook is to forward side of flanged and trapped. Again , not repop..My guess is a stack up of tolerance issues or design flaw of detailed exhaust parts for the m170.

Anyways, have not decided if i am going to modify or leave as is with hook resting on flange..

Brian

Post by **wesk** » Sat Jul 19, 2014 8:02 pm

None of the above photos show the tail pipe outlet resting on the lift shackle ring or the lift shackle ring resting on the tailpipe outlet. The last photo shows the fording extension close to touching the back side of the shackle. The first two photo show very clearly that new from Willys/Kaiser there was no interference.

If your tail pipe outlet flange interferes with your shackle you need to re-bend or tweak the piping before or after the muffler to eliminate the conflict.

bl5211a · Post by **bl5211a** » Sat Jul 19, 2014 8:27 pm

wes, the photo shows the hook pushed forward by the flange..

Post by **wesk** » Sat Jul 19, 2014 8:35 pm

When I looked at that truck before Pizzo sent it to the museum the tailpipe flange was not against the shackle. The fording pipe flange is what causes the slightly forward tilt of the shackle. At any rate the flange belongs just where it is in the 2nd photo and I have made them fit there by tweaking the inaccurately formed repop pipes. Military surplus often included reject stock along with serviceable NOS and I often saw both side by side on the pallets during the old DRMO sales.

M170/ m38a1 Exhaust

M170/ m38a1 Exhaust

Tailpipe extension

pipe