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6.9 Downpipe studs

Started by Max-NL, 15 July 2016, 01:00 PM

Max-NL

While removing the rusted exhaust system of the 6.9 all 4 bolts broke, which isn't really a problem but more of an annoyance. So now we have to punch out the old nut en install a new one. But that isn't the problem.

The problem is, is that the old exhaust was fastened with a bolt, while 6.9's up to #1629 used a stud and spring system (heat expansion or fibration, I don't know). So we went to the dealer and said order it. They later said that the stud it's NLA. So now we have a 6.9 with no exhaust (have not yet started it without ::) ) and have no way of mounting the new exhaust.

So my question is, does anybody have 4 of those , or know the dimensions so that we can duplicate it. Part # is N000835008135.

I attached a pic to explain it better.
1971 R107 350 SL
1972 W108 280 SEL 3.5
1975 W116 280 S
1975 W116 450 SEL 6.9 #140
1977 W123 230
1992 W124 230 CE
2001 Ducati Monster S4

rumb

'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS
'21 E450 Cabrio

Peter

Hi Max, if you google image search "exhaust stud springs" you will see a few different set ups as this system is used on other makes of car. then if you have dimensions etc you should be able to find something usable

tcj

Hi Max,

look for DIN835. Size: M8.
But I can't decode the quality (5.8? 8.8?) or the nominal length from your number.

Be careful when mesuring your old stud: the nominal lenght is the total length minus 16mm
in your case.

By the way: EPC shows that you should use N304017008028 here.
112.021
113.042
116.028
116.036

floyd111

MERCEDES-BENZ
304017008028
14 г
30 мм
M 8 x 50

If that last number is correct, I am not sure it's unavailable or NLA. Lot of hits online.
Was still available at MB 3 months ago. Should be still.
Still, there's a brand called "DT" Their part number 440362 seems identical in shape and size

nathan

Heh Max,
did you sort your manifolds
i pulled an engine out of 6.9 #18 (the engine is #12!) and i remembered you had a question about these exhaust manifold springs and bolts. this is a pic from the engine
regards
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

Max-NL

Hi Nathan no I haven't really. We decided to just use regular bolts. Is it possible for you to measure the studs so I could buy similar or replicate them? I'd need the overall length of the stud, the length of the threaded part which goes into the exhaust manifold (a) and the length of the threaded part at the downpipe (b) (and maybe just in case the length of the unthreaded part in the middle).
1971 R107 350 SL
1972 W108 280 SEL 3.5
1975 W116 280 S
1975 W116 450 SEL 6.9 #140
1977 W123 230
1992 W124 230 CE
2001 Ducati Monster S4

nathan

Hi Max,
if you remind me on the next weekend, ill try and get the bolts off of do all these measurements. 
I have the car at another site to my home so won't see it for a few days!  heck, Im may be attending a classic car race at the Nurburgring in June if you are 'in the area'!
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

Max-NL

Hi Nathan,
I'll try to remind you. Depends on what your definition is of 'in the area', I'll probably be home which is about 3h and 300 km away.
1971 R107 350 SL
1972 W108 280 SEL 3.5
1975 W116 280 S
1975 W116 450 SEL 6.9 #140
1977 W123 230
1992 W124 230 CE
2001 Ducati Monster S4

nathan

thats just down the road distance here in Australia  ;)! I have to fly for 3 hours to get to the next capital city in Australia!
PM me later in the week and ill get those measurements assuming those bolts come off and dont shear off
regards
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

irvine

Surly any exhaust specialist/center can easily fab up fixings.

nathan

Irvine, its about the originality if possible!
Max, the nut was 13mm at the free end and the square end at the other wasn't quite 13 (larger) but the square end was not quite 14mm (smaller!).
the bolt itself was 7mm wide or so and you can see the distance and measurements. the spring is under quite a bit of tension when done up
hope the pics help
regards
Nathan
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

daantjie

Max did you ever go back to spec on your install?
Daniel
1977 450 SEL 6.9 - Astralsilber

floyd111

just checkin site functions..

Max-NL

Hi Daniël, we had a friend of us make the studs, but we didn't have a chance yet to install them. The current mounting system is air tight and there are some other items that have a higher priority.
1971 R107 350 SL
1972 W108 280 SEL 3.5
1975 W116 280 S
1975 W116 450 SEL 6.9 #140
1977 W123 230
1992 W124 230 CE
2001 Ducati Monster S4