Was going throught the FSM on reintalling the Intake and exhaust manifolds as I will be doing this tomorrow when my parts get here...

It mentions replacing the nuts that hold the manifolds on.. And when i looked them up from my parts supplier they show 2 different sizes of copper nuts? I searched through all the threads and couldn't find anyone that had mentioned this. As far as i can tell all the studs take the same size nut and the old ones are not copper I am also missing some of the nuts from whoever took the turbo off the engine at the pnp. Thats why i was thinking of just buying new ones.

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

Does it look as if the Nuts are actually lock Nuts that are supposed to be used only ounce?
Also the Copper parts place Nuts are the solid Copper or plated?

There is also a type of Lock Nut that looks like a reglar Nut but it has 4 cresent shaped indentations on one side of the nut mid way between the threads and the out side of the Nut. On these the ID is slightly smaller on that end.
There is also a type that has little bumps on each corner of the Nut. In the above cases they are not supposed to be reused.

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84 300D, 82 Volvo 244Gl Diesel

No they don't look like locking nuts and appear to me regular nuts

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

I recommend replacing them. I had a bolt break when reinstalling the exhaust manifold on a SEL and it made the job 100% harder.

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1981 300SD 512k OM603

I found these a some turbo VW site so I guess they do make all Copper Nuts.

These M8-1.25mm Lock Nuts are the same fastener used by hundreds of VW dealers all over the United States. These nuts are the correct 12mm hex design s/copper

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84 300D, 82 Volvo 244Gl Diesel

those are the ones i found too .... has anyone removed their manifolds and replaced them?

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

Yes, they are essentially a one time use fastener, only. Taking them off usually smears material around the inside threaded surfaces as it is much softer than the steel stud. They are not anything like "good as new" and are intended to be sacrificial for each assembly. Buy new ones. I get them from the dealer. It is not like you take the manifolds off every Tuesday.

Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

I was just told on another reputable forum not to use these copper nuts but to just get some 10.9 grade 10 mm nuts and lock washers from the hardware store.

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

I have removed and replaced the copper nuts on the exhaust manifolds of all 3 of my 190E 2.3-16's most recently. It has been a decade or more since I have done the same on a 240D and if I recall correctly the intake and exhaust manifolds are kind of integrated, so it is possible only the exhaust fasteners would get the copper. Go to the dealer and buy the nuts the car was designed and built at the factory with, which may or may not be copper on your car. I believe the nuts holding the exhaust manifold sections, at least, will be copper. On cars with intake manifolds that are not integral or intermingled with the exhaust manifolds, like the 190E 2.3-16 and the 1998 E300D TurboDiesel engines, the intake manifold fasteners are not copper as they don't see the temperatures of the exhaust and so don't experience the same thermal expansion stress.

I think the factory design and manufacturing data are the most reputable sources. And for the few bucks ten or twelve nuts cost, it sure beats the chance of snapping off a stud, or redoing the job later if you get exhaust leaks.

Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

Those are for the exhaust downpipe not the manifolds.

That is what i found out just barely on the parts fiche. I will be getting some locking nuts from my Nut and bolt supply house 10.9 grade just like the studs. and copper based high temp anti-seize.

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1987 300D 180k
1985 300SD 330k Helga
1992 300D Lola 269k- Sold
1986 325 coupe Bessie >300k Original engine(ODO Broke) sold
2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it

I have pulled quite a few manifolds at PNP, and my own 617 engines. the only copper nuts I have seen are where the down pipe bolts to the turbo. those are 12mm. (wrench) Gear wrench woks good here.
The 2 nuts on the other end of the down pipe for the long bolts might be copper also.

The nuts that hold the intake/exhaust manifolds look just like steel nuts. don`t remember them being any type lock nut. as I remember there is just the nut and a flat washer. there are 7 nuts, and use a 17mm socket.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

I replaced the manifold gasket on my 1982 300D.

The nuts were not copper. I reused the same nuts with good results.

The manifold gasket has been nicely redesigned and makes a good seal.

At the time, I could not find a torque specification for the manifold nuts.


So there you have it, just another opinion.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

Yea, on mine it was just a steel nut and flat washer. I searched high and low, as well, and couldn't find any torque specs. Haynes says "securely".

If you want to know, call Phil at Fastlane. They sell "exhaust nuts" that are copper in two sizes:

http://catalog.peachparts.com/ShopByVehicle.epc?q=1985-Mercedes--Benz-300d-Exhaust&yearid=1985%40%401985&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6193%3AMBC|1504%3AED|10000135%40%40300D&catid=241035%40%40Exhaust&subcatid=241038@@Exhaust+Nut&mode=PA

I am sure Phil or Roy can give you a definitive answer if these are for the manifold to head joint or the turbocharger joints.

Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)