Muffler install on M151A1

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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mrvtwin95
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Muffler install on M151A1

Post by mrvtwin95 » Tue Jun 30, 2020 2:40 pm

Team,

Searched the directory but couldn't find what I need. Question...I am replacing the muffler on my M151A1. Do I need to remove the driveshaft to do so? I have it loose and it is trapped above the driveshaft. Just wondering do I need to continue to twist and wiggle the muffler to get it out or is it impossible? Thanks in advance.

Rickf
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Re: Muffler install on M151A1

Post by Rickf » Tue Jun 30, 2020 6:24 pm

If you have the original muffler and pipes then it should come apart in sections that do not require you to remove the drive shaft. Fair warning though, I have seen a lot of people looking for those special clamps and gaskets for the pipe connections. It is very close to the rear shaft and it might be easier to drop the rear end of the shaft to get things in there but be sure to have the shaft bolted in before tightening the pipe clamps because the clearance from the pipe to the drive shaft is VERY close. You need to install the whole system with the clamps just loose enough to be able to twist the pipes and then working from front to back you need to twist to fit and tighten as you go. Also note that the A1 and A2 use different rear pipe sections where it goes through the frame.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

mrvtwin95
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Re: Muffler install on M151A1

Post by mrvtwin95 » Wed Jul 01, 2020 6:42 am

Rick,

Thanks for the instruction. I noticed now after looking at the tailpipe piece going to the rear pipe is that the tail pipe is "slip" fitted to the rear pipe. The kit coming in has a flange..I don't have that and I just ordered the pipe I needed...I didn't need a new tail pipe. So now the old tail pipe piece will not join up with the rear pipe. I can't even find the pipe I need with just a smooth end. Is this indicative of an old M151A1 style? My thoughts were to grind the pipe at the end and then slip the old tail pipe piece on...

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W. Winget
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Re: Muffler install on M151A1

Post by W. Winget » Wed Jul 01, 2020 11:19 am

Sounds like your putting an A2 piece in an A1, they would have hacksawn it off in the motorpool VS deadlining the jeep for another month or two to get the correct pipe set in...Usually the Army used up the supply of older model parts "until exhausted" and then you were SOL if you had an earlier type vehicle that needed a part, so unless your going for Factory Class restoration, you answered your question correctly.
V/R W. Winget
Looking for 1918 Standard B 'Liberty' truck parts

Rickf
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Re: Muffler install on M151A1

Post by Rickf » Wed Jul 01, 2020 2:18 pm

I don't understand what it is you are looking for but it sounds like you have an exhaust that was made by a muffler shop. All of the correct pieces should be available from the regular surplus dealers. You have a front pipe from the manifold to the muffler, Flange on the manifold end and special clamp on the muffler end. Then you have the muffler, then you have the intermediate pipe with the special clamps on both ends and then the the A1 or A2 specific tailpipe with the special clamp on one end and the flange on the back end to match up with the exhaust tip which you say you just purchased. The only part that is different between the A1 and A2 is the tail pipe.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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muttguru
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Re: Muffler install on M151A1

Post by muttguru » Wed Jul 01, 2020 2:47 pm

vtwin.....

have a look here.... you'll see the parts listings and where the differences are between the A2 and earlier vehicles.
Ken

http://www.g838.org/viewtopic.php?f=12& ... ust#p54772
Contact address - muttguru@aol.com
Always wanted - Details and pictures of M416 Trailer data plates & M151 data plates & body-tags for my research. Thanks!

mrvtwin95
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Re: Muffler install on M151A1

Post by mrvtwin95 » Wed Jul 01, 2020 8:21 pm

Team,

So I went on the cheap and didn't buy the whole muffler system/kit....yikes. I kept the header pipe and I bought the muffler and the muffler outlet pipe and then the muffler outlet rear. I bought per description for "m151a1". Basically the tailpipe doesn't fit the muffler outlet rear because the tailpipe is a slip fit. The muffler outlet rear has a flange. I will need to wait for the pipes to come in to see exactly what I am up against... I am not looking for exact repro just a system that doesn't leak :lol:

Rickf
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Re: Muffler install on M151A1

Post by Rickf » Thu Jul 02, 2020 6:00 am

With the very tight confines of the M151 you are going to have to go with the original or get a good muffler shop to make you one. The original will probably be cheaper. There are no slip fits on a stock system.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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