hello all changing the primary and secondary fuel filters on a 1983 300sd any thing i should do before removing?

Loosen brass nut on top of primary filter adapter then holding nut unscrew the canister filter. Secondary filter, loosen hose clamps twist and remove filter. Fill the new canister filter with diesel prior to install. It might start then die. Restart it to purge air from secondary filter. Once running you will see a small bubble of air in the secondary filter, normal. Some people for some reason have a hard time restarting because of the air introduced in the fuel line. If thats the case, remove the air cleaner lid and spray WD40 thru the air intake while someone else cranks the engine over. Wash hands open beer!

__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.

thanks alot carnut im new to mb and dont have the manual yet just wanted to make sure the germans werent making it to complicated

I would change the secondary filter first as stated. The secondary filter is the one that looks like a spin on oil filter. Get an adjustable wrench and hold the bolt head at top and try to spin the filter off as you try to loosen the top bolt. Once it is loose the secondary will spin off. Try to fill the new one with some diesel and spin it back on loosely (for now). Next grab a screwdriver and loosen the hose clamps on the primary filter. This is the clear one on the driver's side of the engine. Replace it and tighten clamps.
Now, right next to the clear primary filter is your primer pump. Unscrew the plastic wheel until you can pull it out a little and it becomes free. Start pumping! It may take quite a few pumps but after a while you will see fuel start to come out of the top bolt of the SECONDARY filter. When the fuel comes out snug up the bolt. Then push in on the pump and screw it back in.

Your car should start after a few cranks.

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

That`s the way to do it.

might want to park over some gravel etc... or place some pans under the
vehicle to catch any spills.
The secondary filter will be full to the brim, so be careful tipping it. place
some rags under the filter helps to catch the spills.

Charlie ☺

__________________
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 would get these before you start.) If you central bolt has a metal washer copper or aluminum you will need a new one and a new "O" ring for the central bolt.
Some central bolts do not have this washer and some central bolts have 2 "O" rings.
I changed my primary filter thinking I could do it without changing the "O" ring and It leaked. I was able to find a new one that worked from a "O" ring assortment that I bought long ago from Harbor Freight.

__________________
84 300D, 82 Volvo 244Gl Diesel

Lots of torque on the secondary (spin on). Way more then you would suspect to be necessary.

__________________
Toblin

'79 300D, "Liesel von Diesel", 235K

I kid proofed the house....but they still get in

Maybe, maybe not, similar to an oil filter on a gasser, there is a rubber seal. SOME engines have a crush washer under that bolt, some don't.

__________________
83 SD

84 CD

We, as a site, did not warn a new guy that if his tank vent is plugged and he did not relieve the pressure on his tank before starting he could end up taking a diesel bath. He was pissed that we didn't cover everything that could possibly go wrong.

Be safe, before you start take you tank filler cap off and then put it back on.

-Jim

__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.

Filling the secondary filter with transmission fluid is a lot less messier than using diesel fuel.

__________________
1984 300SD Turbo Diesel 150,000 miles

OBK member #23

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination

I know whom you're speaking of. Except he wasn't a new guy.

__________________
1981 240d - 135k - Arlene

If the fuel cops check you tank, transmission fluid will show up as offroad diesel. The red dye is the same type.

MUCH more of a problem for the guys driving F-350 pick up trucks than for guys driving MBs.

-Jim

__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.