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  #1  
Old 05-26-2002, 01:08 AM
mikemover's Avatar
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Join Date: Aug 2001
Location: Atlanta, GA
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EXHAUSTing Adventure!

MAN!

OK, about 10 days ago, the "flex-pipe" part of my exhaust on the SD broke...Was making a noticeable noise, but I put up with it for a week or so, while I ordered the part, waited, picked it up, and procrastinated putting it on for a couple of days. If finally broke completely and got REALLY loud, so I bit the bullet and tackled it yesterday, and it was a BIG pain in the a$$!! Took me all day!

Removed the air filter housing, bracket, and the associated hoses, etc. I think it was the original, 23 year old pipe, so of course the nuts were completely baked onto the studs! I managed to get it off while only rounding off one of them, and only breaking one of my deep sockets! I was prepared for the rounded nut, I had a couple of spares on hand.

So far so good...By now the "flex" part of the pipe was completely broken, so the upper half of the pipe is off. So far so good. The lower part, still attached to the rest of the exhaust system, WOULD NOT come off! It had been cooked together by 23 years of heat! I had the car on jackstands, and was underneath, beating the thing to death!! Still wouldn't budge. Ended up having to take the whole exhaust system off the car, drag it out from under the car, heat the flanged part with a torch, and bang the old pipe mercilessly with a large hammer to FINALLY get it out.

OK, old part is off, put the rest of the exhaust back under the car, several of my neighbors are now outside, wondering what all the banging and cursing is about..."Oh, it's just Mike, tinkering with that crazy old car again..."

So, the new one should go on easily, right? Well, sort of. I put it in place, attached it to the back of the turbo, attached the bracket that braces it against the manifold, attached the other bracket below, and everything's looking good.

Then I get under the car to attach the bottom end. Uh-oh. Old exhaust pipe has a flange. New pipe has a flange. WTF?!?!?! Same size, no way they are going together! Whose idea was that? The "flex" part of the new pipe is an upgraded design, with a flexible braided "pipe", instead of the old style multi-section flex hose. Very cool, looks like it will last a LOT longer than the old design. That I'm happy about. The unexpected flange on the bottom end I am VERY unhappy about!!! Why would they change that, so that it will not mate up with the rest of your original exhaust?!?!

After much thinking, tool-throwing, and more cursing, I ended up tying the exhaust pipe/muffler assembly to the bottom of the car, driving down the street (slowly and carefully, and loudly!) to a muffler shop to have them cut the flange off the exhaust pipe, and weld the exhaust pipe directly to the new part.

Now it's a very solid and clean installation, but A LOT more work than it should have been. Sucks that they changed the design so that it's not compatible with the rest of the exhaust...I guess they just want you to buy and ENTIRE new exhaust system! The rest of mine is fine...probably has another 6-8 years in it, at least, so I was NOT going to do that! I still saved a lot of money doing it myself, but I was very angry that it would not simply bolt up, and I had to spend an extra $30 at the muffler shop, and a lot of extra time under my car!

Oh, well...Problem solved. The SD was "very loud" for about a week, now it's back to "moderately loud."

Just thought I'd share my frustration, and maybe it will be a heads-up for anyone else who needs to replace one.

Mike

__________________
_____
1979 300 SD
350,000 miles
_____
1982 300D-gone---sold to a buddy
_____
1985 300TD
270,000 miles
_____
1994 E320
not my favorite, but the wife wanted it

www.myspace.com/mikemover
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  #2  
Old 05-26-2002, 03:03 PM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,277
First, I do not know how people can live without an oxygen acetylene rig.... LOL.....
In case you want to take exhaust stuff in the future.... ( old Jaguars did this )... you can use copper bolts and brass or copper washers to put them together... very different from steel after a few years of heating and cooling.... Even a copper nut on a steel stud is better than steel on steel when it comes to exhausts....
TCane was here yesterday to do the FAQ page on setting valves... and brought with him a pulley stuck on a power steering pump... he had really struggled with it... 30 seconds with a big welding tip ( not a heating rose ) and splashing water on it twice and it came right off like it should have in the first place... Physics ! Can't live without it.... LOL
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  #3  
Old 05-26-2002, 04:29 PM
mikemover's Avatar
All-seeing, all-knowing.
 
Join Date: Aug 2001
Location: Atlanta, GA
Posts: 5,514
hahaha...Yeah, physics can be your friend or your enemy, depending on whether you have the proper tools at your disposal!

The replacement nuts that I used on the upper end, and the bracket below, are copper. Hopefully I won't have to worry about that for a number of years, however. *crossing fingers*

Mike
__________________
_____
1979 300 SD
350,000 miles
_____
1982 300D-gone---sold to a buddy
_____
1985 300TD
270,000 miles
_____
1994 E320
not my favorite, but the wife wanted it

www.myspace.com/mikemover
www.myspace.com/openskystudio
www.myspace.com/speedxband
www.myspace.com/openskyseparators
www.myspace.com/doubledrivemusic
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  #4  
Old 05-27-2002, 01:02 AM
billrok's Avatar
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Join Date: Dec 2001
Location: Chicago area
Posts: 242
Talking

Greg, I agree, right after purchase of the cool 14mm bent Hazet valve adjusting wrenches, any self-respecting DIYer should invest in the multiuse HeatWrench!! LOL
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Orland Park, IL
1985 300SD 215,000 miles
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  #5  
Old 12-17-2003, 11:27 AM
JHZR2's Avatar
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Join Date: Jan 2002
Location: New Jersey
Posts: 4,239
Does anybody have more info on the fact that apparently the new downpipe/header pipes are flanged just like the original exhaust? Was this just an odd situation, or are the chances such that Ill run into this as well? id hate to have to cut and reweld all the parts together. I dont really wish to ruin a brand new flex downpipe, and if its definitely going to fail, I might try to find another option...

Any info would be great.
Thanks,

JMH
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Current Diesels:
1981 240D (73K)
1982 300CD (162k)
1991 350SD (113k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #6  
Old 12-17-2003, 03:04 PM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,277
I am figuring you don't have a factory shop manual to look at... because when you read in them you see that a large number of the parts in your car came in about three different versions ( some more).... so it is important to look at the part you are wanting to replace and check on what a parts supplier is offering...

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